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Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Dec. 31, 2017	Dec. 29, 2017
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	ALTR
Entity Registrant Name	ALTAIR ENGINEERING INC.
Entity Central Index Key	0001701732
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Public Float		$ 636.5
Class A Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding	26,725,484
Class B Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding	36,507,676

Consolidated balance sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 39,213	$ 16,874
Accounts receivable, net	86,635	70,498
Inventory, net	1,980	1,227
Income tax receivable	6,054	9,069
Prepaid expenses and other current assets	10,006	7,435
Total current assets	143,888	105,103
Property and equipment, net	31,446	29,708
Goodwill	62,706	36,625
Other intangible assets, net	24,461	11,168
Deferred tax assets	8,351	62,896
Other long-term assets	17,019	5,276
TOTAL ASSETS	287,871	250,776
CURRENT LIABILITIES:
Current portion of long-term debt	232	10,435
Accounts payable	4,880	5,009
Accrued compensation and benefits	26,560	22,955
Obligations for acquisition of businesses	13,925	2,649
Other accrued expenses and current liabilities	21,744	16,296
Deferred revenue	130,122	100,661
Total current liabilities	197,463	158,005
Long-term debt, net of current portion	178	74,806
Deferred revenue, non-current	9,640	13,268
Stock-based compensation awards		22,236
Other long-term liabilities	17,647	17,114
TOTAL LIABILITIES	224,928	285,429
Commitments and contingencies
MEZZANINE EQUITY	2,352
STOCKHOLDERS' EQUITY (DEFICIT):
Preferred stock ($0.0001 par value), authorized 45,000 shares, none issued and outstanding as of December 31, 2017; none authorized, issued or outstanding as of December 31, 2016
Additional paid-incapital	232,156	39,688
Accumulated deficit	(166,499)	(67,092)
Accumulated other comprehensive loss	(5,072)	(7,264)
Total Altair Engineering Inc. stockholders' equity (deficit)	60,591	(34,663)
Noncontrolling interest		10
TOTAL STOCKHOLDERS' EQUITY (DEFICIT)	60,591	(34,653)
TOTAL LIABILITIES, MEZZANINE EQUITY AND STOCKHOLDERS' EQUITY (DEFICIT)	287,871	250,776
Class A Common Stock [Member]
STOCKHOLDERS' EQUITY (DEFICIT):
Common stock	2	1
Class B Common Stock [Member]
STOCKHOLDERS' EQUITY (DEFICIT):
Common stock	$ 4	$ 4

Consolidated balance sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Preferred stock, par value	$ 0.0001	$ 0.0000
Preferred stock, shares authorized	45,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A Common Stock [Member]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	513,797,000	76,000,000
Common stock, shares issued	26,725,000	8,900,000
Common stock, shares outstanding	26,725,000	8,900,000
Class B Common Stock [Member]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	41,203,000	44,000,000
Common stock, shares issued	36,508,000	41,204,000
Common stock, shares outstanding	36,508,000	41,204,000

Consolidated statements of operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue:
Software	$ 244,817	$ 223,818	$ 205,567
Software related services	35,397	35,770	37,294
Total software	280,214	259,588	242,861
Client engineering services	46,510	47,702	45,075
Other	6,609	5,950	6,193
Total revenue	333,333	313,240	294,129
Cost of revenue:
Software	36,360	31,962	27,406
Software related services	26,888	27,653	30,079
Total software	63,248	59,615	57,485
Client engineering services	38,131	38,106	36,081
Other	5,212	4,879	5,642
Total cost of revenue	106,591	102,600	99,208
Gross profit	226,742	210,640	194,921
Operating expenses:
Research and development	93,234	71,325	62,777
Sales and marketing	79,958	66,086	63,080
General and administrative	87,979	57,202	54,069
Amortization of intangible assets	5,448	3,322	2,624
Other operating income	(6,620)	(2,742)	(2,576)
Total operating expenses	259,999	195,193	179,974
Operating (loss) income	(33,257)	15,447	14,947
Interest expense	2,160	2,265	2,416
Other expense (income), net	994	(520)	782
(Loss) income before income taxes	(36,411)	13,702	11,749
Income tax expense	62,996	3,539	818
Net (loss) income	$ (99,407)	$ 10,163	$ 10,931
(Loss) income per share:
Net (loss) income per share attributable to common stockholders, basic	$ (1.89)	$ 0.21	$ 0.23
Net (loss) income per share attributable to common stockholders, diluted	$ (1.89)	$ 0.18	$ 0.19
Weighted average shares outstanding:
Weighted average number of shares used in computing net (loss) income per share, basic	52,466	48,852	46,609
Weighted average number of shares used in computing net (loss) income per share, diluted	52,466	57,856	58,709

Consolidated statements of comprehensive (loss) income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (99,407)	$ 10,163	$ 10,931
Other comprehensive income (loss), net of tax:
Foreign currency translation (net of tax effect of $0, $(60) and $953, respectively)	2,351	20	(2,115)
Retirement related benefit plans (net of tax effect of $0, $195 and $(36), respectively)	(159)	(576)	(253)
Other comprehensive income (loss)	2,192	(556)	(2,368)
Comprehensive (loss) income	(97,215)	9,607	8,563
Less: comprehensive loss attributable to noncontrolling interest			(1)
Comprehensive (loss) income attributable to Altair Engineering Inc.	$ (97,215)	$ 9,607	$ 8,564

Consolidated statements of comprehensive (loss) income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Foreign currency translation, tax effect	$ 0	$ (60)	$ 953
Retirement related benefit plans, tax effect	$ 0	$ 195	$ (36)

Consolidated statements of changes in stockholders' equity (deficit) - USD ($)
$ in Thousands

Total

IPO [Member]

Common Stock [Member]

Class A Common Stock [Member]

Common Stock [Member]

Class A Common Stock [Member]

IPO [Member]

Common Stock [Member]

Class B Common Stock [Member]

Common Stock [Member]

Class B Common Stock [Member]

IPO [Member]

Additional Paid-in Capital [Member]

IPO [Member]

Accumulated Deficit [Member]

Accumulated Other Comprehensive Loss [Member]

Total Altair Engineering' Inc. Stockholders' Equity (Deficit) [Member]

IPO [Member]

Non-controlling Interest [Member]

Balance at Dec. 31, 2014

$ (50,261)

$ 1

^[1]

$ 4

^[1]

$ 41,525

$ (87,461)

$ (4,341)

$ (50,272)

$ 11

Balance (in shares) at Dec. 31, 2014

^[1]

4,284

41,564

Net income (loss)

10,931

Issuance of common stock

1,036

Issuance of common stock (in shares)

^[1]

1,728

200

Stock redemptions

(1,221)

Stock redemptions, (in shares)

^[1]

(264)

(84)

Return of capital

(725)

Stock-based compensation

569

Foreign currency translation, net of tax

(2,115)

(2,114)

(1)

(253)

Balance at Dec. 31, 2015

(42,039)

$ 1

^[1]

$ 4

^[1]

41,909

(77,255)

(6,708)

(42,049)

Balance (in shares) at Dec. 31, 2015

^[1]

5,748

41,680

Net income (loss)

10,163

Issuance of common stock

456

Issuance of common stock (in shares)

^[1]

3,484

Stock redemptions

(3,291)

Stock redemptions, (in shares)

^[1]

(322)

(476)

Stock-based compensation

614

Foreign currency translation, net of tax

(576)

Balance at Dec. 31, 2016

(34,653)

$ 1

^[1]

$ 4

^[1]

39,688

(67,092)

(7,264)

(34,663)

Balance (in shares) at Dec. 31, 2016

^[1]

8,900

41,204

Net income (loss)

(99,407)

Issuance of common stock

$ 114,438

$ 1

^[1]

$ 114,437

$ 114,438

Shares converted upon Delaware incorporation

$ 0

^[1]

$ 0

^[1]

$ 0

Issuance of common stock (in shares)

^[1]

13,800

(2,200)

Shares converted upon Delaware incorporation (in shares)

^[1]

2,496

(2,496)

2001 ISO Plan modification

$ 66,510

2001 ISO Plan modification (in shares)

^[1]

Issuance of common stock for acquisitions

$ 8,712

Issuance of common stock for acquisitions (in shares)

^[1]

988

Exercise of stock options

1,792

Exercise of stock options (in shares)

^[1]

541

Purchase of noncontrolling interests

(29)

(19)

$ (10)

Amortization of mezzanine equity

(8)

Stock-based compensation

1,044

Foreign currency translation, net of tax

2,351

$ 2,351

2,351

(159)

Balance at Dec. 31, 2017

$ 60,591

$ 2

^[1]

$ 4

^[1]

$ 232,156

$ (166,499)

$ (5,072)

$ 60,591

Balance (in shares) at Dec. 31, 2017

^[1]

26,725

36,508

[1]	All references to Common stock refer to the Company's currently existing Class A and Class B shares following the Recapitalization as described in Note 10.

Consolidated statements of changes in stockholders' equity (deficit) (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Statement of Stockholders' Equity [Abstract]
Initial public offering issuance costs	$ 4,830

Consolidated statements of cash flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
OPERATING ACTIVITIES:
Net (loss) income	$ (99,407)	$ 10,163	$ 10,931
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	11,747	9,980	8,378
Provision for bad debt	610	291	145
Write-down of inventory to net realizable value	270	179	1,003
Stock-based compensation expense	47,281	5,132	597
Deferred income taxes	52,571	(6,076)	(9,131)
Other, net	28	86	124
Changes in assets and liabilities:
Accounts receivable	(10,397)	(4,397)	(8,120)
Prepaid expenses and other current assets	1,559	(2,337)	(5,115)
Other long-term assets	(11,288)	(930)	(1,526)
Accounts payable	(1,087)	(1,321)	558
Accrued compensation and benefits	2,060	2,366	2,006
Other accrued expenses and current liabilities	6,207	(1,173)	2,488
Deferred revenue	15,937	9,422	8,500
Net cash provided by operating activities	16,091	21,385	10,838
INVESTING ACTIVITIES:
Payments for acquisition of businesses	(15,582)	(6,499)	(2,757)
Capital expenditures	(7,522)	(9,444)	(5,233)
Payments for acquisition of developed technology	(2,120)	(154)
Other investing activities, net	373	64	(40)
Net cash used in investing activities	(24,851)	(16,033)	(8,030)
FINANCING ACTIVITIES:
Payments on revolving commitment	(154,187)	(136,087)	(91,673)
Borrowings under revolving commitment	126,832	151,928	103,186
Proceeds from issuance of Class A common stock in initial public offering, net of underwriting commissions	119,268
Principal payments on long-term debt	(59,869)	(16,232)	(15,950)
Payments for IPO offering costs	(4,644)
Proceeds from issuance of common stock	1,792	456	291
Proceeds from issuance of debt	1,541	2,030	1,248
Payments for redemption of common stock	(1,045)	(3,049)	(1,744)
Payment for return of capital		(725)
Other financing activities	(130)	(185)	(55)
Net cash provided by (used in) financing activities	29,558	(1,864)	(4,697)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1,641	(362)	(1,639)
Net increase (decrease) in cash, cash equivalents and restricted cash	22,439	3,126	(3,528)
Cash, cash equivalents and restricted cash at beginning of year	17,139	14,013	17,541
Cash, cash equivalents and restricted cash at end of period	39,578	17,139	14,013
Supplemental disclosures of cash flow:
Interest paid	2,092	2,190	2,261
Income taxes paid	5,893	5,909	5,626
Supplemental disclosure of non-cash investing and financing activities:
Promissory notes issued and deferred payment obligations for acquisitions	12,352	4,182	750
Issuance of common stock in connection with acquisitions	8,712		745
Issuance of common stock with put rights	2,352
Property and equipment and developed technology in accounts payable, other accrued expenses and current liabilities, and other liabilities	582	1,777	178
Initial public offering costs in accounts payable	186
Capital leases	$ 124	129	270
Notes issued for stock redemptions		$ 807	753
Obligations for return of capital in other current liabilities			$ 725

Description of Business	12 Months Ended
Description of Business	Dec. 31, 2017
Accounting Policies [Abstract]
Description of Business	1. Description of business Altair Engineering Inc. (“Altair” or the “Company”) incorporated in the state of Michigan in 1985 and became a Delaware corporation in October 2017. The Company is a provider of enterprise-class engineering software enabling innovation across the entire product lifecycle from concept design to in-service operation. The Company is based in Troy, Michigan. The Company’s simulation-driven approach to innovation is powered by its broad portfolio of high-fidelity and high-performance physics solvers. The Company’s integrated suite of software optimizes design performance across multiple disciplines including structures, motion, fluids, thermal management, electromagnetics, system modeling and embedded systems, while also providing data analytics and true-to-life visualization and rendering. Altair’s engineering and design platform offers a wide range of multi-disciplinary computer aided engineering (“CAE”) solutions. The Company engages with its customers to provide consulting, training, and support, especially when applying optimization. Altair also provides Client Engineering Services to support its customers with long-term ongoing product design and development expertise. This has the benefit of embedding the Company within customers, deepening its understanding of their processes, and allowing the Company to more quickly perceive trends in the overall market, helping the Company to better tailor its research and development and sales initiatives. The Company hires simulation specialists, industrial designers, design engineers, materials experts, development and test specialists, manufacturing engineers and information technology specialists for placement at a customer site for specific customer-directed assignments. *Initial public offering* In November 2017, the Company closed its initial public offering (“IPO”), in which the Company issued and sold 9,865,004 shares of Class A common stock inclusive of the underwriters’ option to purchase additional shares that was exercised in full. The price per share to the public was $13.00. The Company received aggregate proceeds of $119.3 million from the IPO, net of underwriters’ discounts and commissions, before deducting offering costs of approximately $4.8 million. The IPO also included the sale of 3,934,996 shares of Class A common stock by certain stockholders, giving effect to the conversion of 2,200,000 shares of the Company’s Class B common stock into an equivalent number of shares of Class A common stock, and 1,734,996 stock options for Class A common stock exercised by the Company’s chief executive officer. The Company did not receive any proceeds from the sale of shares of Class A common stock by the selling stockholders.

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of significant accounting policies

Principles of consolidation

The accompanying consolidated financial statements have been prepared using accounting principles generally accepted in the United States of America (“GAAP”). The consolidated financial statements include the results of the Company and its controlled subsidiaries. Third-party holdings of equity interests in the Company’s subsidiaries that are less than controlled represent noncontrolling interests. Intercompany accounts and transactions have been eliminated in the consolidated financial statements.

Reclassifications

Certain prior period amounts included in the 2016 consolidated balance sheet and 2016 consolidated statement of cash flows have been reclassified to conform to the current year presentation.

In the accompanying consolidated balance sheet as of December 31, 2016, Obligations for acquisition of businesses has been reclassified out of Other accrued expenses and current liabilities. Note 8 – Other liabilities has been adjusted accordingly. This reclassification had no effect on Total current liabilities.

In the accompanying consolidated statement of cash flows for the year ended December 31, 2016, Payments for acquisition of developed technology has been reclassified out of Other investing activities. This reclassification had no effect on Net cash used in investing activities.

Use of estimates

The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosures of contingent assets and liabilities at the date of the financial statements, and reported amounts of revenue and expenses during the reporting periods. On an ongoing basis, management evaluates its significant estimates including provision for doubtful accounts, tax valuation allowances, liabilities for uncertain tax provisions, impairment of goodwill and intangible assets, retirement obligations, useful lives of intangible assets, revenue for fixed price contracts, valuation of common stock, and stock-based compensation. Actual results could differ from those estimates.

Delaware Conversion

On October 5, 2017, the Company became a Delaware corporation and effected a four-for-one stock split of its common stock. On the effective date of the Company becoming a Delaware corporation, (i) each share of outstanding common stock was increased to four shares of common stock, par value $0.0001 per share, (ii) the number of shares of common stock issuable under each outstanding option to purchase common stock was increased on a four-for-one basis, (iii) the exercise price of each outstanding option to purchase common stock was reduced on a four-for-one basis, and (iv) the redemption price of each outstanding put option was reduced on a four-for-one basis. All share and per share information referenced throughout the consolidated financial statements and notes thereto have been retroactively adjusted to reflect this stock split.

In connection with the Company becoming a Delaware corporation, 2,495,752 shares of Class B common stock, held by holders of less than 3% of Class B common stock immediately prior to the conversion, converted into Class A common stock.

Pursuant to the Company’s Delaware certificate of incorporation, the Company’s authorized capital consists of 513,796,572 shares of Class A common stock, 41,203,428 shares of Class B common stock and 45,000,000 shares of preferred stock.

Foreign currency translation

The functional currency of the Company’s foreign subsidiaries is their respective local currency. The assets and liabilities of the subsidiaries are translated to U.S. dollars at the exchange rate on the balance sheet date. Equity balances and transactions are translated using historical exchange rates. Revenues and expenses are translated at the average exchange rate during the period. Translation adjustments arising from the use of differing exchange rates from period to period are recorded as a component of accumulated other comprehensive loss within stockholders’ equity.

All assets and liabilities denominated in a currency other than the functional currency are remeasured into the functional currency with gains and losses recognized in foreign currency losses, net, in the consolidated statements of operations. The Company has no transactions which hedge purchase commitments and no intercompany balances which are designated as being of a long-term investment in nature.

Revenue recognition

The Company generates revenue from the following sources: (1) Software; (2) Client engineering services; and (3) Other. Revenue is recognized when persuasive evidence of an agreement exists, delivery has occurred or services have been rendered, the fee is fixed or determinable, and collection of the fee is probable or reasonably assured. Certain transactions require that government imposed taxes be assessed to the customer. The Company presents revenue net of such government imposed taxes.

Software revenue

Software component

Software revenue includes product revenue from software product licensing arrangements, related services consisting of software maintenance and support in the form of post-contract customer support (“PCS”), and professional services such as consulting and training services. Software products are sold to customers primarily under a term-based software licensing model and to a lesser degree, perpetual software licenses. Software revenue also includes consulting services from product design and development projects.

Most term-based software license agreements include the Company’s patented units-based subscription model which allows customers to license a pool of units for their organizations, providing individual users flexible access to the Company’s entire portfolio of software applications as well as to its growing portfolio of partner products. The amount of software usage is limited by the number of the units licensed by the customer. Revenue from these arrangements is fixed (based on the units licensed) and is not based on actual customer usage of each software product.

Software product license arrangements may include PCS and professional services, such as consulting and training services, which represent multiple-element arrangements. The Company has analyzed the elements included in its multiple element arrangements and has determined that it does not have vendor-specific objective evidence (“VSOE”) of fair value to allocate revenue to its software products license, PCS, and professional services including consulting and training. For arrangements that have two or more elements such as software, PCS or professional services for which the Company has not established VSOE of fair value, the Company uses the combined services approach to recognize revenue for these transactions. Under the combined services approach, revenue from the software product licenses, including perpetual licenses, PCS and professional services, if applicable, are considered to be one accounting unit and, once the software has been delivered and the provision of each undelivered service has commenced, are recognized ratably over the remaining period of the arrangement which consists of the longer of the PCS period, or the period the professional services are expected to be performed. If the professional services are essential to the functionality of the software products, then revenue recognition does not commence until such services are completed. In transactions with resellers, the Company contracts only with the reseller, in which pricing, length of licenses and support services are agreed upon. The reseller negotiates the price charged and length of licenses and support service directly with its customer.

The term-based software license arrangements typically have a duration of 12 months and include PCS, including the right to receive unspecified software upgrades, when and if available during the license term. The Company does not charge separately for PCS. Revenues for software licenses sold on a term-based model are recognized ratably over the term of the license arrangement, once all other revenue recognition criteria have been met.

The Company also sells perpetual licenses to its customers. The Company does not have VSOE of fair value for PCS, which is sold along with the perpetual licenses. As a result, revenue from these arrangements is recognized ratably over the initial PCS term.

Software related services component

Consulting services from product design and development projects are provided to customers on a time-and-materials (“T&M”) or fixed-price basis. Altair recognizes software services revenue for T&M contracts based upon hours worked and contractually agreed-upon hourly rates. Revenue from fixed-price engagements is recognized using the proportional performance method based on the ratio of costs incurred, to the total estimated project costs. Project costs are based on standard rates, which vary by the consultant’s professional level, plus all direct expenses incurred to complete the engagement that are not reimbursed by the client. Project costs are typically expensed as incurred. The use of the proportional performance method is dependent upon management’s ability to reliably estimate the costs to complete a project. The Company uses historical experience as a basis for future estimates to complete current projects. Additionally, the Company believes that costs are the best available measure of performance. If the costs to complete a project are not estimable or the completion is uncertain, the revenue is recognized upon completion of the services.

Client engineering services revenue

Client engineering services revenue are derived from professional services for staffing primarily representing engineers located at a customer site. These professional services are provided to customers on a T&M basis. The Company recognizes engineering services revenue for T&M contracts based upon hours worked and contractually agreed-upon hourly rates.

Other revenue

Other revenue includes product revenue from the sale of LED products for the replacement of fluorescent tubes. Revenue from the sale of LED products for the replacement of fluorescent tubes is recognized when all revenue recognition criteria stated above are met, which is generally when the products are delivered to resellers or to end customers. Sales returns, which reduce revenue and cost of revenue, are estimated using historical experience.

Cost of revenue

Cost of software

Cost of software revenue consist of expenses related to software licensing and customer support. Significant expenses include employee related costs for support team members, travel costs, and royalties for third-party software products available to customers through the Company’s products or as part of the Company’s Partner Alliance Program.

Cost of client engineering services

Cost of engineering services revenue consist primarily of employee compensation costs.

Cost of other

Cost of other revenue includes the cost of LED lighting products and freight related to products sold to retail and commercial sales channels and third-party royalty expense related to the Company’s WEYV business.

Deferred revenue

Deferred revenue consists of customer billings or payments received in advance of the recognition of revenue and is recognized as revenue when revenue recognition criteria are met.

Cash, cash equivalents and restricted cash

The Company considers all highly liquid investments with original or remaining maturities of 90 days or less at the date of purchase to be cash equivalents. Cash and cash equivalents are recorded at cost, which approximates fair value.

Restricted cash is included in other long-term assets on the consolidated balance sheets. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported in the consolidated balance sheets that sum to the total of the amounts reported in the consolidated statements of cash flows (in thousands):


	December 31,
	2017		2016
Cash and cash equivalents	$	39,213	$	16,874
Restricted cash included in other long-term assets		365		265

Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$	39,578	$	17,139

Restricted cash represents amounts required for a contractual agreement with an insurer for the payment of potential health insurance claims, and term deposits for bank guarantees.

Accounts receivable, net

An allowance for doubtful accounts is recorded when amounts are determined to be uncollectible based on specific identification of customer circumstances, age of the receivable and other available information. Accounts are written off when it becomes apparent that such amounts will not be collected. Generally, the Company does not require collateral or charge interest on accounts receivable. Accounts receivable were reported net of an allowance for doubtful accounts of $0.8 million and $0.6 million at December 31, 2017 and 2016, respectively. Activity in the allowance for doubtful accounts was as follows (in thousands):


	For the year ended December 31,
	2017			2016			2015
Balance, beginning of year	$	(565	)	$	(937	)	$	(1,439	)
Provision charged to expense		(610	)		(291	)		(145	)
Write-offs, net of recoveries		414			638			536
Effects of foreign currency translation		(37	)		25			111

Balance, end of year	$	(798	)	$	(565	)	$	(937	)

Concentrations of credit risk

The Company’s financial instruments that are potentially subject to concentrations of credit risk consist primarily of cash and trade receivables. The risk with respect to trade receivables is partially mitigated by the diversity, both by geography and by industry, of the Company’s customer base. The Company’s accounts receivable are derived from sales to a large number of direct customers and resellers around the world. Sales to customers within the automotive industry accounted for 50%, 50% and 51%, respectively, of the Company’s 2017, 2016 and 2015 revenue, with no other industry representing more than 10% of revenue. No individual customer accounted for 10% or more of revenue in the years ended December 31, 2017, 2016 or 2015.

Inventory

Inventory is stated at the lower of cost and net realizable value. Cost is determined using the first-in, first-out method. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonable predictable costs of completion, disposal and transportation. The valuation of inventory requires management to estimate excess inventory as well as inventory that is not of saleable quality. The determination of obsolete or excess inventory requires management to estimate market conditions and future demand for the Company’s products.

Inventory consisted of the following (in thousands):


	December 31,
	2017		2016
Raw materials	$	—	$	52
Finished goods		1,980		1,175

Total inventory – net	$	1,980	$	1,227

Property and equipment, net

Property and equipment are stated at cost, less accumulated depreciation and amortization. Equipment held under capital leases are stated at the present value of minimum lease payments less accumulated amortization. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets. Leasehold improvements and assets acquired under capital leases are amortized over the lease term or the estimated useful life of the related asset or improvement, whichever is shorter.

Expenditures for maintenance and repairs are charged to expense in the period incurred. Major expenditures for betterments are capitalized when they meet the criteria for capitalization. When assets are retired or otherwise disposed of, the cost and accumulated depreciation are removed from the accounts and any resulting gain or loss is reflected in the consolidated statements of operations in the period realized.

Software development costs

Software development costs incurred prior to the establishment of technological feasibility are expensed as incurred. Technological feasibility is established upon the completion of a detailed program design. Capitalization of software development costs begins upon the establishment of technological feasibility and ends when the product is available for general release. Generally, the time between the establishment of technological feasibility and commercial release of software is short. As such, all internal software development costs have been expensed as incurred and included in research and development expense in the accompanying consolidated statements of operations.

Impairment of long-lived assets

Long-lived assets, such as property and equipment, and definite-lived intangible assets, including developed technology, and customer relationships, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If circumstances require a long-lived asset or asset group to be tested for possible impairment, the Company compares the undiscounted future cash flows expected to be generated by that asset or asset group to its carrying amount. If the carrying amount of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment charge is recognized to the extent that the carrying amount exceeds its fair value. Fair value is determined through various valuation techniques, including discounted cash flow models and third-party independent appraisals. No impairment losses were recognized in 2017, 2016, or 2015.

Goodwill and other indefinite-lived intangible assets

Goodwill represents the excess of the consideration transferred for an acquired entity over the estimated fair values of the net tangible assets and the identifiable assets acquired. As described in Note 4—Acquisitions, the Company has recorded goodwill in connection with certain acquisitions. Goodwill and other indefinite-lived intangible assets are not amortized, but rather are reviewed for impairment annually or more frequently if facts or circumstances indicate that its carrying value may not be recoverable.

The Company has determined that there is one reporting unit with goodwill subject to goodwill impairment testing. An entity has the option to perform a qualitative assessment to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying amount prior to performing the quantitative two-step impairment test. The qualitative assessment evaluates various events and circumstances, such as macro-economic conditions, industry and market conditions, cost factors, relevant events and financial trends that may impact a reporting unit’s fair value. If it is determined that the estimated fair value of the reporting unit is more likely than not less than its carrying amount, including goodwill, the two-step goodwill impairment test is required. Otherwise, no further analysis would be required.

If the two-step impairment test for goodwill is deemed necessary, this quantitative impairment analysis compares the fair value of the Company’s reporting unit to its related carrying value. If the fair value of the reporting unit is less than its carrying amount, an indication of goodwill impairment exists and the Company must perform step two of the impairment test. Under step two, an impairment loss is recognized for any excess of the carrying amount of the reporting unit’s goodwill over the implied fair value of that goodwill. The implied fair value of goodwill is determined by allocating the fair value of the reporting unit in a manner similar to a purchase price allocation and the residual fair value after this allocation is the implied fair value of the reporting unit goodwill. Fair value of the reporting units is determined using an income approach. The income approach is based on projected debt-free cash flows which are discounted to the present value using discount factors that consider the timing and risk of cash flows. The Company also takes into consideration a multiple of earnings valuation technique. The Company believes that this approach is appropriate because it provides a reasonable estimate of the price that would be received to sell the reporting unit in an orderly transaction between market participants at the measurement date. While there are inherent uncertainties related to the assumptions used in this analysis, the Company believes that this approach provides a reasonable estimate of fair value. If the fair value of the reporting unit exceeds its carrying amount, step two does not need to be performed.

The Company performs its annual impairment review of goodwill in the fourth quarter of each year and when a triggering event occurs between annual impairment dates. For 2017, 2016 and 2015, the Company performed a qualitative assessment of goodwill and determined that it was not more likely than not that the fair value of its reporting unit with goodwill was less than the carrying amounts. Accordingly, the Company determined that its goodwill was not impaired.

Receivable for R&D credit

The French government provides a research and development (“R&D”) tax credit known as Credit Impôt Recherche, or CIR, in order to encourage Companies to invest in R&D. The tax credit is deductible from the French income tax and any excess is carried forward for three years. After three years, any unused credit may be reimbursed to the Company by the French government. As of December 31, 2017, the Company had approximately $10.2 million receivable from the French government related to CIR, of which $3.3 million is recorded in income tax receivable and the remaining $6.9 million is recorded in other long-term assets. CIR is subject to customary audit by the French tax authorities.

Valuation of common stock prior to IPO

Due to the absence of an active market for the Company’s common stock prior to the Company’s IPO in the fourth quarter of 2017, the Board of Directors, with the assistance of a third-party valuation specialist, determined the fair value of the Company’s common stock. The valuation methodology included estimates and assumptions including forecasts of future cash flows that required significant judgments. These valuations considered a number of objective and subjective factors, including the Company’s actual operating and financial performance, external market conditions, performance of comparable publicly traded companies, comparable transactions, business developments, likelihood of achieving a liquidity event, such as an initial public offering or sale, and common stock transactions, among other factors. The Company utilized methodologies in accordance with the framework of the American Institute of Certified Public Accountants’ Technical Practice Aid, Valuation of Privately-Held Company Equity Securities issued as Compensation, to estimate the fair value of its common stock. Significant changes to the key assumptions used in the valuations could have resulted in different fair values of the Company’s common stock at each valuation date.

Derivative financial instruments

The Company may use derivative financial instruments, primarily interest rate swap contracts, to hedge its exposure to interest rate risk. Such derivative financial instruments are initially recorded at fair value on the date on which a derivative contract is entered into and are subsequently remeasured to fair value at period end. Any gains or losses arising from changes in fair value on derivative contracts during the year are recorded in other expense (income), net in the consolidated statement of operations. Hedge accounting has not been applied.

Income taxes

The Company accounts for income taxes under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and for operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. The Company records net deferred tax assets to the extent it believes that these assets will more likely than not be realized. These deferred tax assets are subject to periodic assessments as to recoverability and if it is determined that it is more likely than not that the benefits will not be realized, valuation allowances are recorded which increase the provision for income taxes. In making such determination, the Company considers all available positive and negative evidence, including historical taxable income, projected future taxable income, the expected timing and reversal of existing temporary differences and tax planning strategies. If based upon the evidence, it is more likely than not that the deferred tax asset will not be realized, a valuation allowance is recorded. A valuation allowance is recognized to reduce deferred tax assets to the amount that management believes is more likely than not to be realized.

The Company applies a more-likely-than-not recognition threshold to its accounting for tax uncertainties. The Company reviews all of its tax positions and makes determinations as to whether its tax positions are more likely than not to be sustained upon examination by the relevant taxing authorities. Only those benefits that have a greater than fifty percent likelihood of being sustained upon examination by taxing authorities are recognized. Interest and penalties related to uncertain tax positions are recorded in the provision for income taxes in the consolidated statements of operations.

Research and development costs

Research and development costs are expensed as incurred. Research and development expenses consist primarily of salaries and benefits of research and development employees and costs incurred related to the development of new software products and significant enhancements and engineering changes to existing software products.

Advertising costs

Advertising costs are expensed as incurred. Advertising expenses were $3.5 million, $2.5 million and $2.2 million for the years ended December 31, 2017, 2016, and 2015, respectively.

Mezzanine equity

In 2017, the Company issued 200,000 shares of Class A common stock to a third party as partial consideration for the purchase of developed technology. These shares have a put right that can be exercised by the holder five years from date of purchase at $12.50 per share that requires the shares to be recorded at fair value and classified as mezzanine equity in the consolidated balance sheet. As of December 31, 2017, the Company concluded that it is no longer probable that the put option will be exercised as the put value is substantially below market value and subsequent adjustment is not required.

Classification of the of instrument shall remain as mezzanine equity until one of the following three events take place; 1) shares are sold on open market; 2) a redemption feature lapses; or 3) there is a modification of the terms of the instrument. As none of these events have taken place as of December 31, 2017, the classification remains as mezzanine equity.

Stock-based compensation

Employee stock-based awards, consisting of stock options expected to be settled by issuing shares of Class A common stock, are recorded as equity awards. The fair value of these awards on the date of grant is measured using the Black-Scholes option pricing model. The Company expenses the grant date fair value of its time-vested stock options subject to graded vesting using the straight-line method over the applicable service period.

Employee stock-based awards, which consisted of stock options with repurchase features that allowed them to be settled in cash at a purchase price that was less than the current fair value were considered liability-based awards. These awards were initially recorded at fair value and remeasured to fair value at the end of each reporting period until settled. During the quarter ended June 30, 2017, the Company changed its accounting policy to measure the fair value of its liability awards using the Black-Scholes option pricing model as a result of the Company no longer meeting the definition of a non-public entity. The impact of the change in accounting policy was immaterial to the financial statements. Upon IPO effectiveness in the fourth quarter of 2017, the repurchase feature was terminated and resulted in a modification of the option awards and these options were accounted for as equity awards post the Company’s IPO.

Recent accounting guidance

Accounting standards adopted

The Company adopted Accounting Standards Update, “ASU” No. 2015-11, Inventory: Simplifying the Measurement of Inventory, on January 1, 2017. This update amended existing guidance to require an entity to measure inventory within the scope at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonable predictable costs of completion, disposal and transportation. The adoption did not have a material effect on the Company’s consolidated financial statements.

The Company early adopted ASU No. 2016-09, Employee Share-Based Payment Accounting, on October 1, 2017. ASU 2016-09 simplifies various aspects related to how share-based payments are accounted for and presented in the financial statements. On a prospective basis the Company recognizes excess tax benefits or deficiencies on vesting or settlement of awards as discrete items within income tax benefit or provision within net income (loss) and the related cash flows classified within operating activities. With respect to forfeiture accounting policy election, the Company elected to account for forfeitures as they occur, adopted on a modified retrospective basis. The election to account for forfeitures as they occur did not have a material effect on the Company’s consolidated financial statements.

The Company early adopted ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory, on January 1, 2017. Previous guidance required the tax effects from intra-entity asset transfers to be deferred until the asset is sold to a third party or recovered through use. ASU 2016-16 eliminates this deferral for all intra-entity asset transfers other than inventory. The adoption did not have a material effect on the Company’s consolidated financial statements.

The Company early adopted ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, on January 1, 2017. This update revised the definition of a business to assist entities with evaluating whether a set of transferred assets and activities is a business. The adoption did not have a material effect on the Company’s consolidated financial statements.

Accounting standards not yet adopted

Revenue Recognition—In May 2014, the Financial Accounting Standards Board, or “FASB”, issued ASU No. 2014-09, Revenue from Contracts with Customers. This standard outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most existing revenue recognition guidance under GAAP. The core principle of the guidance is that an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires enhanced disclosures about the nature, amount, timing, and uncertainty of revenues and cash flows arising from contracts with customers. Entities have the option of using either a full retrospective or a modified retrospective approach for the adoption of the new standard. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers: Deferral of the Effective Date that defers the effective date of ASU 2014-09 for all entities by one year for public business entities. This ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within that reporting period. For all other entities, including emerging growth companies, this ASU is effective for fiscal years beginning after December 15, 2018, and interim periods within annual periods beginning after December 15, 2019. Early adoption is permitted.

Under existing GAAP, the Company does not have vendor-specific objective evidence (“VSOE”) of fair value for post-contract customer support (“PCS”) sold along with software products licenses; therefore, revenues for the software products licenses (including perpetual licenses), PCS and professional services, if applicable, are considered to be one accounting unit and, once all services have commenced, are recognized ratably over the remaining period of the arrangement (the longer of the contractual service term or PCS term). Under ASU 2014-09, the concept of assessing VSOE has been eliminated and the Company must estimate a fair value associated with each performance obligation within an arrangement. As a result, the Company expects the timing of revenue recognition to be accelerated because it anticipates that license revenue will be recognized at a point in time, rather than over time, which is its current practice. Generally, the license revenue component of an arrangement represents a significant portion of the overall fair value of a software arrangement. As a result, the Company expects the impact of adopting ASU 2014-09 to have a significant impact on the consolidated financial statements. The Company has elected to adopt this standard effective on January 1, 2019 using a modified retrospective approach. The Company is currently evaluating the impact this standard will have on its consolidated financial statements.

Financial Instruments—In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments—Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. This standard affects the accounting for equity instruments, financial liabilities under the fair value option and the presentation and disclosure requirements of financial instruments. ASU 2016-01 is effective in the first quarter of 2019. The Company is evaluating the impact of the adoption of ASU 2016-01 on its financial statements and related disclosures.

Leases—In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This standard amends various aspects of existing accounting guidance for leases, including the recognition of a right-of-use asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. This standard also introduces new disclosure requirements for leasing arrangements. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years for public business entities. For all other entities, including emerging growth companies, ASU 2016-02 is effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. Early adoption is permitted. The new standard must be adopted using a modified retrospective approach, and provides for certain practical expedients. The Company is evaluating the impact of the adoption of ASU 2016-02 on its financial statements and related disclosures.

Cash Classification—In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, to improve financial reporting in regard to how certain transactions are classified in the statement of cash flows. ASU 2016-15 provides guidance for targeted changes with respect to how cash receipts and cash payments are classified in the statements of cash flows, with the objective of reducing diversity in practice. ASU 2016-15 is effective for interim and annual periods beginning after December 15, 2017, for public business entities. For all other entities, including emerging growth companies, ASU 2016-15 is effective for fiscal years beginning after December 15, 2018, and interim periods within fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is evaluating the impact of the adoption of ASU No. 2016-15 on its financial statements and related disclosures.

Goodwill Impairment—In January 2017, the FASB issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, which simplifies accounting for goodwill impairments by eliminating step two from the goodwill impairment test. This guidance is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019, for public business entities that are Securities and Exchange Commission (SEC) filers, and December 15, 2020, for public business entities that are not SEC filers. For all other entities, including emerging growth companies, ASU 2017-04 is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2021. Early adoption is permitted for interim and annual goodwill impairment tests performed on testing dates after January 1, 2017. The new standard must be applied on a prospective basis. The adoption of this guidance is not expected to have a material impact on the Company’s consolidated financial statements.

Retirement Benefits – In March 2017, the FASB issued ASU 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. This ASU requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component. The new guidance is effective for public business entities for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2017. For all other entities, including emerging growth companies, ASU 2017-07 is effective for annual periods beginning after December 15, 2018, and interim periods within annual periods beginning after December 15, 2019. Early adoption is permitted as of the beginning of an annual period. The adoption of this guidance is not expected to have a material impact on the Company’s consolidated financial statements.

Stock Compensation – In May 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU amends the guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The new guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2017. Early adoption is permitted for interim or annual periods. The Company is evaluating the impact of the adoption of ASU No. 2017-09 on its financial statements and related disclosures.

Derivatives and Hedging – In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. This ASU amends the guidance with the objective of improving the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements. In addition, this ASU amends the current guidance to simplify the application of the hedge accounting guidance. For public business entities, the amendments are effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2018. For all other entities, including emerging growth companies, the amendments are effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. Early adoption is permitted. The Company is currently evaluating the impact of the new guidance on its consolidated financial statements.

Fair Value Measurements

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

3. Fair value measurements

The accounting guidance for fair value, among other things, defines fair value, establishes a consistent framework for measuring fair value and expands disclosure for each major asset and liability category measured at fair value on either a recurring or nonrecurring basis. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The framework for measuring fair value consists of a three-level valuation hierarchy that prioritizes the inputs to valuation techniques used to measure fair value based upon whether such inputs are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect market assumptions made by the reporting entity. The three-level hierarchy for the inputs to valuation techniques is briefly summarized as follows:


Level 1—		Quoted prices in active markets for identical assets and liabilities at the measurement date;

Level 2—		Observable inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and

Level 3—		Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.

An asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used need to maximize the use of observable inputs and minimize the use of unobservable inputs.

Items measured at fair value on a recurring basis

The following table sets forth a summary of the changes in the fair value of the Company’s Level 3 financial liabilities (in thousands):


	Liability for Class A redeemable common shares			Liability for stock-based compensation awards
Balance at December 31, 2015		6,692			11,033
Shares issued upon exercise of stock options		1,841			—
Repurchase of shares		(79	)		—
Exercise of stock options		—			(2,084	)
Forfeitures of stock options		—			(110	)
Change in fair value		2,178			2,765

Balance at December 31, 2016		10,632			11,604
Exercise of stock options		432			(411	)
Forfeitures of stock options		—			(157	)
Change in fair value		19,223			25,191
Modification to stock options as a result of the Company’s IPO⁽¹⁾		(30,287	)		(36,227	)

Balance at December 31, 2017	$	—		$	—

₍₁₎

As a result of the Company’s IPO in the fourth quarter of 2017, the call feature terminated which resulted in the $66.5 million liability valued immediately prior to the IPO associated with the Company’s Class A redeemable common shares and with the stock options outstanding under the 2001 ISO and NQSO Plan to be reclassified to equity in the fourth quarter of 2017 in accordance with ASC 718.

The carrying value of cash and cash equivalents, accounts receivable and accounts payable approximate fair value due to their short maturities. Interest on the Company’s long-term debt is at a variable rate, and as such the debt obligation outstanding approximates fair value.

The carrying value of the Company’s derivative financial instruments are measured at fair value on a recurring basis. The fair value of derivatives is determined based on inputs derived from or corroborated by observable market data pertaining to relevant interest rates and is considered a level 2 fair value measurement. See Note 9—Financial instruments for additional information regarding the use and fair value of derivatives.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Acquisitions

12 Months Ended

Dec. 31, 2017

Business Combinations [Abstract]

Acquisitions

4. Acquisitions

Runtime Design Automation

On September 28, 2017, the Company acquired 100% of the shares of Runtime Design Automation (“Runtime”) for a total of $19.4 million in cash, of which $9.4 million is payable one year from the acquisition date, which includes a $0.7 million working capital adjustment, and 708,000 shares of the Company’s Class A common stock. Runtime complements Altair’s PBS Works™ suite of products for comprehensive, secure workload management for HPS and cloud environments and has solutions to manage highly complex workflows. PBS Works targets product design, weather prediction, oil exploration and bio-informatics, and Runtime primarily serves customers in electronic design automation.

The following table summarizes the consideration transferred to acquire Runtime and the amounts of identified assets acquired and liabilities assumed at the acquisition date (in thousands):


Fair value of consideration transferred	$	25,691

Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash		564
Accounts receivable		2,257
Deferred tax assets		1,713
Other assets		257
Trade names		440
Developed technology (4-year life)		7,870
Customer relationships (7-year life)		2,490
Accounts payable and other liabilities		(1,000	)
Deferred revenue		(1,925	)
Deferred tax liabilities		(4,454	)

Total net identifiable assets acquired and liabilities assumed		8,212

Goodwill	$	17,479

Goodwill is primarily attributable to synergies expected to arise after the acquisition and is not deductible for tax purposes.

Carriots S.L.

In May 2017, the Company acquired 100% of the shares of Carriots S.L. (“Carriots”) for $3.6 million cash, $2.7 million notes payable, and 80,000 shares of the Company’s Class A common stock. Carriots is an Internet of Things (“IoT”) Cloud platform that allows easy development of new IoT enabled products. Carriots complements Altair’s other product suites to provide a comprehensive solution for customers to design and implement IoT enabled products.

The following table summarizes the consideration transferred to acquire Carriots and the amounts of identified assets acquired and liabilities assumed at the acquisition date (in thousands):


Fair value of consideration transferred	$	6,657

Recognized amounts of identifiable assets acquired and liabilities assumed:
Deferred tax assets		394
Other assets		472
Trade names		252
Developed technology (4-year life)		1,317
Customer relationships (7-year life)		296
Accounts payable and other liabilities		(1,015	)

Total net identifiable assets acquired and liabilities assumed		1,716

Goodwill	$	4,941

Goodwill is primarily attributable to synergies expected to arise after the acquisition and is not deductible for tax purposes.

CEDRAT S.A.

In April 2016, the Company completed the acquisition of all of the common shares of CEDRAT S.A. (“CEDRAT”) for $3.7 million in cash and $1.4 million in a note payable. CEDRAT is in the field of simulating low-frequency electromagnetics and thermal simulations for electric motor design. The acquisition of CEDRAT and its Flux technology complements Altair’s broad software coverage, including Altair’s comprehensive set of solvers for the rapidly growing electromagnetic market.

The following table summarizes the consideration transferred to acquire CEDRAT and the amounts of identified assets acquired and liabilities assumed at the acquisition date (in thousands):


Fair value of consideration transferred	$	5,122

Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash	$	363
Accounts receivable		542
Income tax receivable		995
Other assets		206
Trade names		269
Developed technology (4-year life)		1,085
Customer relationships (7-year life)		938
Accounts payable and other liabilities		(2,742	)
Deferred revenue		(290	)

Total net identifiable assets acquired and liabilities assumed		1,366

Goodwill⁽¹⁾	$	3,756

₍₁₎	The goodwill included $3.5 million that was tax deductible.

Other business acquisitions

During the years ended December 31, 2017, 2016 and 2015, the Company completed other business acquisitions that were individually and in the aggregate insignificant. The Company has accounted for all of its acquisitions using the acquisition method. The operating results of each acquisition have been included in the consolidated financial statements since the respective dates of acquisition.

The combined purchase price related to the 2017 acquisitions, excluding Runtime and Carriots, was not material.

The combined purchase price related to the 2016 acquisitions, excluding CEDRAT, was $6.0 million, which consisted of cash of $3.1 million and notes payable of $2.9 million. The total consideration transferred was allocated to assets and liabilities of each acquisition based on management’s estimates of the fair values of the assets acquired and liabilities assumed. The allocation included $2.3 million to intangibles, consisting of developed technology, customer relationships, and trade names and $4.1 million to goodwill. There was no taxable goodwill associated with the Company’s other 2016 acquisitions.

The combined consideration transferred related to the 2015 acquisitions was $4.4 million, which consisted of cash of $2.9 million, equity of $0.7 million and notes of $0.8 million. The total consideration transferred was allocated to assets and liabilities of each acquisition based on management’s estimates of the fair values of the assets acquired and liabilities assumed. The allocation included $1.9 million to intangibles, consisting of developed technology, customer relationships, and trade names and $2.9 million to goodwill, of which $1.0 million was tax deductible.

For each of its acquisitions the Company engaged a third-party valuation firm to assist the Company in valuing certain assets and liabilities acquired.

Property and Equipment, Net

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

5. Property and equipment, net

Property and equipment consists of the following (in thousands):


	Estimated useful lives		December 31,
	Estimated useful lives		2017			2016
Land		Indefinite	$	7,994		$	7,994
Building and improvements		5-39 years		15,185			14,956
Computer equipment and software		3-5 years		32,103			27,461
Office furniture and equipment		5-15 years		6,751			5,306
Leasehold improvements		⁽¹⁾		6,467			5,397

Total property and equipment				68,500	⁽²⁾		61,114	⁽²⁾
Less: accumulated depreciation and amortization				37,054			31,406

Property and equipment, net			$	31,446		$	29,708

₍₁₎	Shorter of lease term or estimated useful life, generally ranging from five to ten years.

₍₂₎	Equipment under capital lease obligations had an original carrying value of approximately $1.1 million and $1.4 million at December 31, 2017 and 2016, respectively.

In November 2016, the Company purchased land adjacent to Altair’s corporate headquarters for future expansion of the Company’s facilities for $4.0 million.

Depreciation expense, including amortization of assets under capital lease, was $6.3 million, $6.7 million and $5.8 million for the years ended December 31, 2017, 2016 and 2015, respectively.

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

6. Goodwill and other intangible assets

Goodwill

The changes in the carrying amount of goodwill, which is attributable to the Software reporting segment, are as follows (in thousands):


Balance at December 31, 2014	$	28,859
Acquisitions		2,897
Effects of foreign currency translation		(2,516	)

Balance at December 31, 2015		29,240
Acquisitions		7,855
Effects of foreign currency translation		(470	)

Balance at December 31, 2016		36,625
Acquisitions		22,420
Effects of foreign currency translation		3,661

Balance at December 31, 2017	$	62,706

Other intangible assets

A summary of other intangible assets is shown below (in thousands):


	December 31, 2017
	Weighted average amortization period		Gross carrying amount		Accumulated amortization		Net carrying amount
Definite-lived intangible assets:
Developed technology		4 years	$	25,947	$	9,909	$	16,038
Customer relationships		7 years		11,794		6,195		5,599
Noncompete agreements		5 years		824		824		—
Other intangibles		10 years		143		57		86

Total definite-lived intangible assets				38,708		16,985		21,723

Indefinite-lived intangible assets:
Trade names				2,738				2,738

Total other intangible assets			$	41,446	$	16,985	$	24,461


	December 31, 2016
	Weighted average amortization period		Gross carrying amount		Accumulated amortization		Net carrying amount
Definite-lived intangible assets:
Developed technology		4 years	$	10,631	$	5,034	$	5,597
Customer relationships		7 years		8,646		4,977		3,669
Noncompete agreements		5 years		824		824		—
Other intangibles		10 years		117		40		77

Total definite-lived intangible assets				20,218		10,875		9,343

Indefinite-lived intangible assets:
Trade names				1,825				1,825

Total other intangible assets			$	22,043	$	10,875	$	11,168

Amortization expense related to amortizing intangible assets was $5.4 million, $3.3 million and $2.6 million for the years ended December 31, 2017, 2016 and 2015, respectively.

Estimated amortization expense for the next five years as of December 31, 2017 is as follows (in thousands):


Year ending
December 31, 2018	$	6,692
December 31, 2019	$	5,653
December 31, 2020	$	5,015
December 31, 2021	$	2,931
December 31, 2022	$	639

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Debt

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Debt

7. Debt

The carrying value of debt is as follows (in thousands):


	December 31,
	2017		2016
Prior Credit Agreement:
Revolving Credit Facility	$	—	$	27,355
Term Loan A		—		57,500
Obligations held under capital leases (Note 18)		207		196
Other borrowings		203		330

Total debt		410		85,381
Less: unamortized debt issuance costs		—		140
Less: current portion of long-term debt		232		10,435

Long-term debt, net of current portion	$	178	$	74,806

Credit agreement

Revolving credit facility

On October 19, 2017, the Company entered into an amended and restated credit agreement with Altair Engineering Inc., as borrower, JPMorgan Chase Bank, N.A., as the lead arranger, sole book runner, the administrative agent, swingline lender and letter of credit issuer, and a syndicate of lenders (“2017 Credit Agreement”). The 2017 Credit Agreement became effective on satisfaction of certain conditions including the closing of the Company’s IPO and provides for an initial aggregate commitment amount of $100.0 million, with a sublimit for the issuance of letters of credit of up to $5.0 million and a sublimit for swingline loans of up to $5.0 million. The 2017 Credit Agreement matures on October 18, 2022.

The 2017 Credit Agreement allows the Company to request that the aggregate commitments under the 2017 Credit Agreement be increased by up to $50.0 million for a total of $150.0 million, subject to certain conditions, by obtaining additional commitments from the existing lenders or by causing a person acceptable to the administrative agent to become a lender (in each case subject to the terms and conditions set forth in the 2017 Credit Agreement).

As of December 31, 2017, the Company had no outstanding borrowings under the 2017 Credit Agreement and there was $100.0 million available for future borrowing. The 2017 Credit Agreement is available for general corporate purposes, including working capital, capital expenditures, and permitted acquisitions.

Borrowings under the 2017 Credit Agreement bear interest at a rate per annum equal to an agreed upon applicable margin plus, at the Company’s option, either the Alternate Base Rate (defined as the greatest of (1) the Prime Rate (as defined in the 2017 Credit Agreement) in effect on such day, (2) the Federal Funds Effective Rate (as defined in the 2017 Credit Agreement) in effect on such day plus 1/2 of 1.00% or (3) the Adjusted LIBO Rate (as defined in the 2017 Credit Agreement) for a one month interest period on such day (or if such day is not a business day, the immediately preceding business day) plus 1.00%) or the Adjusted LIBO Rate. The applicable margin for borrowings under the 2017 Credit Agreement is based on the Company’s most recently tested consolidated total net leverage ratio and will vary from (a) in the case of Eurodollar loans, 1.25% to 2.00%, and (b) in the case of ABR loans or swingline loans, 0.25% to 1.00%.

The Company pays a commitment fee ranging from 0.15% to 0.30% on the unused portion of the 2017 Credit Agreement.

Collateral and guarantees

The 2017 Credit Agreement is secured by collateral including (i) substantially all of the Company’s properties and assets, and the properties and assets of the Company’s domestic subsidiaries but excluding any patents, copyrights, patent applications or copyright applications or any trade secrets or software products and (ii) pledges of the equity interests in all present and future domestic subsidiaries (subject to certain exceptions as provided for under the 2017 Credit Agreement). The Company’s direct and indirect domestic subsidiaries are guarantors of all of the obligations under the 2017 Credit Agreement.

Debt covenants

The 2017 Credit Agreement requires the Company to maintain the following financial covenants:

•

Maximum Net Leverage Ratio: Commencing with the fiscal quarter ending December 31, 2017 and on the last day of each fiscal quarter thereafter, the Company on a consolidated basis will not permit the ratio of total indebtedness (net of unrestricted domestic cash in excess of $20.0 million) to EBITDA, as such terms are defined in the 2017 Credit Agreement, for the rolling four quarter period ending on such date to be greater than 3.00 to 1.00 as of the last day of each fiscal quarter.

•

Consolidated Interest Coverage Ratio: Commencing with the fiscal quarter ending December 31, 2017 and on the last day of each fiscal quarter thereafter, the Company on a consolidated basis will not permit the ratio of (x) EBITDA to (y) cash Consolidated Interest Expense, as such terms are defined in the 2017 Credit Agreement, in each case for the rolling four quarter period ending on such date, to be less than 3.00 to 1.00 as of the last day of each fiscal quarter.

At December 31, 2017, the Company was in compliance with all such financial covenants.

Prior credit agreement

Prior to entering into the 2017 Credit Agreement, the Company’s credit agreement consisted of a $65.0 million term loan (“Term Loan A”) and a $60.0 million revolving commitment (“2016 Revolving Credit Facility”) including a $5.0 million swingline subfacility, and a letter of credit subfacility (collectively, the “Secured Credit Agreement”.)

At December 31, 2016, there was $57.5 million outstanding under Term Loan A at an interest rate of 2.6% based on the LIBO rate and the applicable margin. The Company was required to make quarterly principal payments on Term Loan A of $2.5 million in 2017, 2018 and March 2019. Any outstanding principal balance was to be paid in full on the maturity date of April 18, 2019.

At December 31, 2016, the Company had $27.4 million outstanding under the 2016 Revolving Credit Facility and there was $32.6 million available for future borrowing. The 2016 Revolving Credit Facility was available for general corporate purposes, including working capital, capital expenditures, and permitted acquisitions. All borrowings under the 2016 Revolving Credit Facility were due on the termination date in April 2019. The weighted-average interest rate on borrowings under the 2016 Revolving Credit Facility was 2.6% for the year ended December 31, 2016.

On November 3, 2017, in connection with the completion of the Company’s IPO, the Company repaid in full all outstanding debt under the Secured Credit Agreement. The Company paid a total of approximately $93.1 million, which included outstanding principal, interest, and other nominal costs. Upon the repayment of the Secured Credit Agreement, all unamortized debt issuance costs were recorded as interest expense.

Other

The Company has available overdraft and line of credit facilities in several countries in which it operates. These credit facilities are with various domestic and international banks and are at quoted market rates. At both December 31, 2017 and 2016, the Company had $3.5 million of availability under these facilities and there were no outstanding commitments.

Scheduled maturities of long-term debt

At December 31, 2017, future maturities of long-term debt, excluding capital leases, were as follows (in thousands):


Year ending December 31,
2018	$	126
2019		77
2020		—
2021		—
2022		—

Total	$	203

Other Liabilities

12 Months Ended

Dec. 31, 2017

Other Liabilities Disclosure [Abstract]

Other Liabilities

8. Other liabilities

The following table provides the details of other accrued expenses and current liabilities (in thousands):


	December 31,
	2017		2016
Accrued VAT	$	3,916	$	3,928
Income taxes payable		3,724		2,156
Accrued professional fees		2,500		1,389
Accrued royalties		2,037		1,583
Non-income tax liabilities		1,343		739
Defined contribution plan liabilities		1,274		1,139
Billings in excess of cost		832		1,021
Related party liabilities		119		1,045
Other current liabilities		5,999		3,296

Total	$	21,744	$	16,296

The following table provides the details of other long-term liabilities (in thousands):


	December 31,
	2017		2016
Pension and other post retirement liabilities	$	7,670	$	5,959
Deferred tax liabilities		1,620		1,379
Other liabilities		8,357		9,776

Total	$	17,647	$	17,114

Financial Instruments	12 Months Ended
Financial Instruments	Dec. 31, 2017
Investments, All Other Investments [Abstract]
Financial Instruments	9. Financial instruments The Company is exposed to certain financial market risks related to its ongoing business operations. The primary risks the Company manages through derivative financial instruments and hedging activities are foreign currency exchange rate risk and interest rate risk. Derivative financial instruments and hedging activities can be utilized to protect the Company’s cash flow from adverse movements in foreign currency exchange rates and to manage interest costs. Although the Company is exposed to credit loss in the event of nonperformance by the counterparty to the derivative financial instruments, the Company attempts to limit this exposure by entering into agreements directly with major financial institutions that meet the Company’s credit standards and that are expected to fully satisfy their obligations under the contracts. *Interest rate swaps* Interest rate exposures are reviewed periodically and the Company may enter into interest rate swap agreements to manage its exposure. The Company’s exposure to interest rate risk arises primarily from changes in the LIBO rate. The Company will hold these derivatives for economic purposes but does not designate these derivatives to obtain hedge accounting treatment. As such, gains or losses on these contracts (including contracts that do not qualify for hedge accounting under ASC 815), are reported in earnings immediately as Other expense (income), net. These contracts limit exposure to changes in interest payments associated with variable rate debt. However, as the change in the fair value of the interest rate swaps is impacted by both realized and unrealized gains and losses on the contracts, the amount recognized in earnings may not offset the changes in the variability of interest expense during a given period. As of December 31, 2017, and 2016, the Company had an interest rate swap outstanding with a $4.5 million notional value. This interest rate swap matures on December 23, 2019. *Foreign currency derivatives* The Company sells its products (and incurs costs) in countries throughout the world. As a result, it is exposed to fluctuations in foreign currency exchange rates. Foreign currency exposures are reviewed on a periodic basis and any natural offsets are considered prior to entering into a derivative financial instrument. The Company could enter into foreign exchange contracts to hedge portions of its foreign currency denominated forecasted revenues, purchases and the subsequent cash flows after considering natural offsets within the consolidated group. The Company will hold these derivatives for economic purposes but does not designate these derivatives to obtain hedge accounting treatment. As such, gains or losses on these contracts (including contracts that do not qualify for hedge accounting under ASC 815), are reported in earnings immediately and are substantially offset by the effect of the revaluation of the underlying foreign currency denominated transactions. There were no foreign exchange contracts outstanding at December 31, 2017 or 2016. *Derivative instruments* As of December 31, 2017 and 2016, the fair value of the Company’s derivative instruments included in other long-term liabilities was a liability of $0.2 million and $0.3 million, respectively. *Credit-risk-related contingent features* The Company has entered into International Swaps and Derivatives Association (“ISDA”) agreements with its significant derivative counterparty. These agreements provide bilateral netting and offsetting of accounts that are in a liability position with those that are in an asset position. These agreements do not require the Company to maintain a minimum credit rating in order to be in compliance and do not contain any margin call provisions or collateral requirements that could be triggered by derivative instruments in a net liability position. As of December 31, 2017, the Company had not and was not required to post any collateral to support its derivatives in a liability position.

Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2017
Equity [Abstract]
Stockholders' Equity	10. Stockholders’ equity *Preferred stock* As of December 31, 2017, the Company had authorized 45,000,000 shares of preferred stock, par value $0.0001, of which no shares were issued or outstanding. The Board of Directors has the authority to issue the preferred stock in one or more series and to fix rights, preferences, privileges, and restrictions, including dividends and the number of shares constituting any series or the designation of such series, without any further vote or action by the stockholders. *Common stock* As of December 31, 2017, the Company had authorized 513,796,572 shares of Class A common stock, par value $0.0001, and 41,203,428 shares of Class B common stock, par value $0.0001. The rights of the holders of Class A common stock and Class B common stock are identical, except with respect to voting and conversion rights. Each share of Class A common stock is entitled to one vote per share. Each share of Class B common stock is entitled to ten votes per share and is convertible into one share of Class A common stock. The holders of Class A and Class B common stock are entitled to dividends at the sole discretion of the Board of Directors. No common stock dividends were declared or paid in 2017, 2016 or 2015. *Recapitalization* On April 3, 2017, the Company completed a recapitalization (the “Recapitalization”) of its capital stock by filing a certificate of amendment to its articles of incorporation with the State of Michigan pursuant to which: (i) each share of the Company’s Class A voting common stock, or old Class A shares, automatically converted into one share of new Class B voting common stock entitled to ten votes per share; and (ii) each share of the Company’s Class B non-voting common stock, or old Class B shares, automatically converted into one share of new Class A voting common stock entitled to one vote per share, in each case, without any further action on the part of the holders thereof. Subsequent to the Recapitalization, the Company’s authorized common stock consists of 76,000,000 shares of no par, Class A common stock and 44,000,000 shares of no par, Class B common stock. Prior to the Recapitalization, the Company’s authorized common stock consisted of 99,279,884 shares of no par, Class A Voting Common Stock and 25,153,872 shares of no par, Class B Nonvoting Common Stock. Each class of common stock had equal and identical rights, preferences and limitations, other than voting. The holders of old Class A common stock were entitled to one vote per share on all matters submitted to the stockholders for a vote and holders of old Class B common stock had no voting rights. *Other* In October 2015, the Company acquired Altair Bellingham, LLC from significant stockholders of the Company for cash of $0.7 million, which was paid in February 2016. This transaction was reported as a return of capital for the year ended December 31, 2015.

Stock-Based Compensation

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

11. Stock-based compensation

2001 stock-based compensation plans

Nonqualified stock option plan

In 2001, the Company established the Nonqualified Stock Option Plan (“NSO Plan”) under which 6,441,972 stock options with an exercise price of $.000025 remain outstanding at December 31, 2017. The NSO Plan was terminated in 2003. Stock options under the NSO plan were immediately vested and have a contractual term of 35 years from the date of grant. The outstanding awards will continue to be governed by their existing terms under the NSO Plan. The NSO Plan is accounted for as an equity plan.

The following table summarizes the stock option activity under the NSO Plan:


	Number of options			Weighted average exercise price per share		Weighted average remaining contractual term (years)
Outstanding at January 1, 2017		6,458,472		$	0.000025		20 years
Granted		—			—
Exercised		(16,500	)	$	—
Forfeited		—		$	—

Outstanding at December 31, 2017		6,441,972		$	0.000025		19 years

Exercisable at December 31, 2017		6,441,972		$	0.000025		19 years

Incentive and nonqualified stock-based plan

Also in 2001, the Company established the Incentive and Nonqualified Stock-based Plan (“ISO Plan”) which was terminated in 2011 and was authorized to issue nonqualified stock options (“NQSO”) and incentive stock options (“ISO”) totaling 11,153,872 shares of Class A common stock. The NQSO grants could be issued at less than the fair market value at date of grant under the terms of the ISO Plan, while ISO grants were issued at a price equal to or greater than the fair market value at date of grant. Options generally vest over a two to three-year period. All options have a contractual term of ten years from the date of grant. At December 31, 2017 and 2016, there were 888,864 and 2,972,744 options outstanding, respectively, under the ISO Plan.

Until the effective date of the Company’s IPO, options granted under the ISO Plan were accounted for as liability awards as the terms of the awards could require or allow repurchase of the shares at amounts different than fair value. The Company made the accounting policy election to use the intrinsic value method of accounting to determine stock-based compensation liabilities for these awards. During the quarter ended June 30, 2017, the Company changed its accounting policy to measure the fair value of its liability awards using the Black-Scholes option pricing model as a result of the Company no longer meeting the definition of a non-public entity. The impact of the change in accounting policy was immaterial to the financial statements.

The ISO Plan also included stock-based compensation liability for 2,340,596 of Class A shares outstanding at December 31, 2016, resulting from the Company’s call feature with an exercise price that may be set at less than the fair market value at date of grant under the terms of the ISO Plan. The Company utilized the fair value of the outstanding Class A shares to determine the stock-based compensation liabilities for these shares, based on the respective dates.

As a result of the Company’s IPO in the fourth quarter 2017, the call feature terminated which resulted in the $66.5 million liability valued immediately prior to the IPO associated with the Company’s Class A redeemable common shares and with the stock options outstanding under the 2001 ISO and NQSO Plan to be reclassified to equity as of December 31, 2017 in accordance with ASC 718.

The following table summarizes the stock option activity under the 2001 Stock-based compensation plans for the periods indicated as follows:


	Number of options			Weighted average exercise price per share		Weighted average remaining contractual term (years)
Outstanding at January 1, 2017		2,972,744		$	0.64		3.4
Granted		—			—
Exercised⁽¹⁾		(2,070,916	)	$	0.63
Forfeited		(12,964	)	$	0.53

Outstanding at December 31, 2017		888,864		$	0.67		2.5

Exercisable at December 31, 2017		888,864		$	0.67		2.5

₍₁₎	Includes 1.7 million stock options exercised in connection with the Company’s IPO.

The total intrinsic value of the ISO Plan stock options exercised during the years ended December 31, 2017 and 2016 was $25.6 million and $2.7 million, respectively.

2012 stock-based compensation plans

During 2012, the Company established the 2012 Incentive and Nonqualified Stock Option Plan (“2012 Plan”) which permits the issuance of 5,200,000 shares of Class A common stock for the grant of nonqualified stock options (“NQSO”) and incentive stock options (“ISO”) for management, other employees, and board members of the Company. The options are issued at a price equal to or greater than fair market value at date of grant. All options have a contractual term of 10 years from date of grant.

The 2012 Plan is accounted for as an equity plan. For those options expected to vest, compensation expense is recognized on a straight-line basis over a four-year period, the total requisite service period of the awards. Compensation expense related to the 2012 Plan was $0.7 million, $0.6 million and $0.6 million for the years ended December 31, 2017, 2016 and 2015, respectively.

The following table summarizes the stock option activity under the 2012 Plan for the periods indicated as follows:


	Number of options			Weighted average exercise price per share		Weighted average remaining contractual term (years)
Outstanding at January 1, 2017		1,797,252		$	3.13		7.5
Granted		608,948		$	5.18
Exercised		(189,492	)	$	2.60
Forfeited		(33,581	)	$	3.89

Outstanding at December 31, 2017		2,183,127		$	3.74		7.3

Exercisable at December 31, 2017		1,240,692		$	3.01		6.2

Total compensation cost related to nonvested awards not yet recognized as of December 31, 2017 totaled $1.5 million, and is expected to be recognized over a weighted average period of 2.8 years.

The Company measures the fair value of its equity awards on the date of grant using the Black-Scholes option pricing model. This valuation model requires the Company to make certain estimates and assumptions, including assumptions related to the expected price volatility of the Company’s stock, the period under which the options will be outstanding, the rate of return on risk-free investments, and the expected dividend yield for the Company’s stock.

The weighted average assumptions used in the Black-Scholes option pricing model used to calculate the fair value of options granted during the years ended December 31, 2017, 2016 and 2015 are as follows:


	2017 grants		2016 grants		2015 grants
Weighted average grant date fair value per share	$	1.86-$1.94	$	1.42-$1.65	$	1.43
Expected volatility		34%		37%		37%
Expected term (in years)		5.75-6.25		5.75-6.25		6.25
Risk-free interest rate		2.02%		1.37%-1.79%		1.98%
Expected dividend yield		0%		0%		0%

Prior to the IPO, the Company’s equity value was estimated utilizing a combination of the Discounted Cash Flow Method under the Income Approach, the Guideline Public Company Method, and the Transaction Method under the Market Approach. The equity value is used to derive the fair value per share which is used as an input in the Black Scholes option pricing model. The estimated volatility was derived using the historical volatility of the returns of comparable publicly traded companies. The risk-free rate was based on U.S. Treasury zero-coupon yield curves with a remaining term equal to the expected term of the option. The Company has not historically paid dividends and does not anticipate paying cash dividends in the foreseeable future. The Company used the simplified method to determine expected term.

Other

In connection with the acquisition of Runtime Design Automation (“RTDA”), all outstanding stock options of RTDA became fully vested and exercisable prior to the date of consummation which represents an acceleration to full vesting of all unvested stock options as of the date of the business combination.

The accounting treatment for the outstanding stock options in the context of the business combination is to allocate the fair market value of RTDA’s options at the date of consummation attributable to pre-combination service to the aggregate merger consideration. The difference between the fair market value of the replacement awards and the amount allocable to pre-combination service was considered a post-combination expense to the Company after the consummation date.

The estimated post combination expense to the Company as a result of the business combination was approximately $2.0 million which was immediately expensed in the post combination financial statements in the third quarter of 2017, as there were no further service conditions. The Company determined that the Black-Scholes model was an appropriate valuation model for the employee share options as all of RTDA’s stock options had only service conditions.

The stock-based compensation expense was recorded as follows (in thousands):


	Year ended December 31,
	2017		2016		2015
Cost of revenue-software	$	350	$	22	$	44
Research and development		12,540		1,370		149
Sales and marketing		7,693		775		109
General and administrative		26,698		2,965		295

Total stock-based compensation expense	$	47,281	$	5,132	$	597

On September 27, 2017, the Company’s board of directors adopted the 2017 Equity Incentive Plan (“2017 Plan”), and the 2017 Plan was approved by the Company’s stockholders. The 2017 Plan became effective on October 30, 2017, which was one business day prior to the effective date of the Company’s IPO. The 2017 Plan provides for the grant of incentive stock options to the Company’s employees and any parent and subsidiary corporations’ employees, and for the grant of nonstatutory stock options, stock appreciation rights, restricted stock, restricted stock units, performance units, performance shares, other cash-based awards and other stock-based awards to the Company’s employees, directors and consultants and the Company’s parent, subsidiary, and affiliate corporations’ employees and consultants. The 2017 Plan has 6,207,976 authorized shares of the Company’s Class A common stock reserved for issuance. No issuances have been made under the 2017 Plan as of December 31, 2017.

Other Expense (Income), Net

12 Months Ended

Dec. 31, 2017

Other Income and Expenses [Abstract]

Other Expense (Income), Net

12. Other expense (income), net

Other expense (income), net consists of the following (in thousands):


	Year ended December 31,
	2017			2016			2015
Foreign exchange (gain) loss	$	1,254		$	(271	)	$	973
Other		(260	)		(249	)		(191	)

Other expense (income), net	$	994		$	(520	)	$	782

Income Taxes

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

13. Income taxes

The components of (loss) income before income taxes are as follows (in thousands):


	Year ended December 31,
	2017			2016			2015
U.S.	$	(49,761	)	$	(2,225	)	$	(6,861	)
Non-U.S.		13,350			15,927			18,610

	$(36,411)			$13,702			$11,749

The significant components of the income tax expense are as follows (in thousands):


	Year ended December 31,
	2017			2016			2015
Current
U.S. Federal	$	—		$	—		$	—
Non-U.S.		10,290			9,413			9,893
U.S. State and Local		135			202			56

Total current		10,425			9,615			9,949

Deferred
U.S. Federal		54,130			(5,358	)		(8,445	)
Non-U.S.		(1,306	)		(610	)		(587	)
U.S. State and Local		(253	)		(108	)		(99	)

Total deferred		52,571			(6,076	)		(9,131	)

Income tax expense	$	62,996		$	3,539		$	818

The reconciliation of income taxes calculated at the U.S. Federal statutory income tax rate of 35% to income tax expense is as follows (in thousands):


	Year ended December 31,
	2017			2016			2015
Income taxes at U.S. federal statutory rate	$	(12,744	)	$	4,796		$	4,117
Foreign income taxes at rates other than the federal statutory rate		373			(584	)		(10	)
U.S. state and local income taxes, net of U.S. federal tax benefit		(155	)		94			(47	)
U.S. Tax Cut and Jobs Act: transition tax, net of foreign tax credits		4,187			—			—
Change in valuation allowance		47,429			—			—
Foreign withholding taxes		4,181			4,235			3,790
Foreign dividends		—			5,077			4,152
U.S. foreign tax credit		(4,154	)		(8,786	)		(9,808	)
Research and development tax credit		(2,999	)		(2,696	)		(1,608	)
Domestic production activities deduction		—			(840	)		(833	)
Non-deductible stock-based compensation		10,871			2,064			234
Meals & entertainment		358			235			258
Other		(163	)		(91	)		125
Deferred tax on investment in subsidiary		—			(264	)		(214	)
Uncertain tax position		446			299			662
Tax law changes		15,366			—			—

Income tax expense	$	62,996		$	3,539		$	818

The effective tax rate for the year ended December 31, 2017, as compared to December 31, 2016, was impacted by increased tax expense of approximately $15.4 million due to the enactment of the Tax Cuts and Jobs Act (the “Tax Act”) in the United States on December 22, 2017, entirely offset by a valuation allowance. The Tax Act significantly revises the U.S. corporate income tax by, among other things, lowering corporate income tax rates and imposing a one-time transition tax on deemed repatriated earnings of foreign subsidiaries. The impact was primarily the result of increased tax expense due to the one-time transition tax with an offset of foreign tax credits amounting to $4.2 million, and a valuation allowance in the amount of $47.0 million recorded against the net deferred tax assets in the U.S.

The enactment of the Tax Cuts and Jobs Act (the “Tax Act”) in the United States on December 22, 2017, significantly revises the U.S. corporate income tax by, among other things, lowering corporate income tax rates from 35% to 21% and imposing a one-time transition tax on deemed repatriated earnings of foreign subsidiaries. Pursuant to the guidance within SEC Staff Accounting Bulletin No. 118 (“SAB 118”), as of December 31, 2017, the Company recognized the provisional effects of the enactment of the Tax Act for which measurement could be reasonably estimated. Although the Company continues to analyze certain aspects of the Tax Act and refine its assessment, the ultimate impact of the Tax Act may differ from these estimates due to the Company’s continued analysis, or further regulatory guidance that may be issued as a result of the Tax Act. Pursuant to SAB 118, adjustments to the provisional amounts recorded by the Company as of December 31, 2017, that are identified within a subsequent measurement period of up to one year from the enactment date, will be included as an adjustment to tax expense from continuing operations in the period the amounts are determined.

The Company remeasured certain U.S. deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%. However, the Company is still analyzing certain aspects of the Tax Act and refining its calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts. The provisional amount recorded related to the remeasurement of net deferred tax assets and deferred tax liabilities was a net tax charge of $15.4 million, which was fully offset by an adjustment to the valuation allowance. Additionally, the Company recorded a deferred tax benefit of $1.3 million for the reduction of a deferred tax liability related to an indefinite-lived intangible asset. The Tax Act did not change the Company’s judgment regarding the realizability of these net deferred tax assets.

The one-time transition tax is based on the Company’s total post-1986 earnings and profits (“E&P”) that were previously deferred from U.S. income taxes and for which no deferred taxes were recorded since the Company previously claimed the indefinite reinvestment assertion exception on these earnings. In December 2017, the Company recorded a provisional amount for its one-time transition tax liability of $4.2 million, net of foreign tax credits. The Company has not yet completed its calculation of the total post-1986 E&P and associated foreign tax credits for these foreign subsidiaries. Further, the transition tax is based in part on the amount of those earnings held in cash and other specified assets. This amount may change when the Company finalizes the calculation of post-1986 foreign E&P previously deferred from U.S. federal taxation, and finalizes the amounts held in cash or other specified assets. The Company anticipates that additional guidance and clarification regarding the implementation of the transition tax will be issued by federal and state taxing authorities and the Company’s estimate is, therefore, subject to future refinement.

Deferred income tax assets and liabilities result from differences in the basis of assets and liabilities for tax and financial statements purposes. The approximate tax effect of each type of temporary difference, and operating losses and tax credit carryforwards that give rise to a significant portion of the deferred tax assets and liabilities are as follows (in thousands):


	December 31,
	2017			2016
Deferred tax assets:
Deferred revenue	$	19,569		$	16,966
Net operating loss carryforwards		7,601			3,550
Tax credit carryforwards		22,191			17,839
Stock-based compensation		8,922			15,825
Capitalized research and development		8,798			12,492
Accrued expenses		648			1,775
Employee benefits		3,931			3,995
Other		1,905			2,527

Total gross deferred tax assets		73,565			74,969
Less: valuation allowances		(54,331	)		(4,153	)

Net deferred tax assets⁽¹⁾		19,234			70,816
Deferred tax liabilities:
Prepaid royalties		6,925			5,821
Property and equipment and intangibles		4,567			2,394
Deferred tax on investment in subsidiary		272			272
Other		739			812

Total deferred tax liabilities		12,503			9,299

Total net deferred tax assets	$	6,731		$	61,517

₍₁₎	Reflects gross amount before jurisdictional netting of deferred tax assets and liabilities.

The Company’s accounting for the indefinite reinvestment assertion is incomplete. However, a reasonable estimate of book and tax basis was calculated, and the Company made a provisional assertion. In general, it is the practice and intention of the Company to repatriate previously taxed earnings and to reinvest all other earnings of its non-U.S. subsidiaries. As part of the Tax Act, the Company incurred U.S. tax on substantially all of the earnings of its non-U.S. subsidiaries as part of the one-time transition tax. This tax increased the Company’s previously taxed earnings and will allow for the repatriation of the majority of its foreign earnings without any residual U.S. federal tax. This assertion is subject to change as additional information is gathered to precisely compute the book and tax basis of the Company’s non-U.S. subsidiaries.

The following table summarizes the changes to the valuation allowance balance at December 31, 2017, 2016 and 2015 (in thousands):


	December 31,
	2017		2016			2015
Beginning balance	$	4,153	$	2,452		$	2,858
Additions charged to expense		47,429		177			—
Deductions		—		(207	)		(270	)
Other		2,749		1,731			(136	)

Ending balance	$	54,331	$	4,153		$	2,452

Additions charged to expense for 2017 of $47.4 million are primarily related to the recording of a valuation allowance against the Company’s U.S. deferred tax assets. In evaluating the need for a valuation allowance, Altair considered the large U.S. federal tax deduction that resulted when non-qualified stock options were exercised in connection with the Company’s IPO in November 2017, and expected NSO exercises and determined that it was not more likely than not that the U.S. deferred tax assets would be realized.

The following table summarizes the amount and expiration dates of operating loss and tax credit carryforwards at December 31, 2017 (in thousands):


	Expiration dates		Amounts
U.S. general business credits and loss carryforwards		2018-2037	$	24,564
Foreign loss carryforwards		indefinite		2,879
U.S. foreign tax credits		2027		2,349

Total operating loss and tax credit carryforwards			$	29,792

A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows (in thousands):


	Year ended December 31,
	2017			2016		2015
Unrecognized tax benefits—January 1	$	5,604		$	5,305	$	4,712
Increase in unrecognized tax benefits as a result of:
Additions for tax positions of current period		634			299		826
Reductions for tax positions of prior periods		(81	)		—		(233	)

Unrecognized tax benefits—December 31	$	6,157		$	5,604	$	5,305

At December 31, 2017, the Company had $6.2 million of gross unrecognized tax benefits that if recognized would affect the effective tax rate and adjustments to other tax accounts, primarily deferred taxes. It is reasonably possible that a change in the Company’s gross unrecognized tax benefits may occur in the next twelve months; however, it is not possible to reasonably estimate the effect this may have upon the gross unrecognized tax benefits.

The Company operates globally but considers its more significant tax jurisdictions to include the United States, India, Germany, Japan, and China. India has tax years open for examination from 2005 through 2016. All other significant jurisdictions have open tax years from 2013 through 2016.

The Company records interest and penalties with respect to unrecognized tax benefits as a component of the provision for income taxes. For the years ended December 31, 2017 and 2016, accrued interest and penalties related to unrecognized tax benefits were insignificant. For the year ended December 31, 2015, accrued interest and penalties related to unrecognized tax benefits were $0.1 million.

(Loss) Income Per Share

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

(Loss) Income Per Share

14. (Loss) income per share

Basic (loss) income per share attributable to common stockholders is computed using the weighted average number of shares of common stock outstanding for the period, excluding stock options. Diluted (loss) income per share attributable to common stockholders is based upon the weighted average number of shares of common stock outstanding for the period and potentially dilutive common shares, including the effect of stock options under the treasury stock method. The following table sets forth the computation of the numerators and denominators used in the basic and diluted (loss) income per share amounts (in thousands, except per share data):


	Year ended December 31,
	2017			2016		2015
Numerator:
Net (loss) income	$	(99,407	)	$	10,163	$	10,931

Denominator:
Denominator for basic (loss) income per share—weighted average shares		52,466			48,852		46,609
Effect of dilutive securities, stock options		—			9,004		12,100

Denominator for dilutive (loss) income per share		52,466			57,856		58,709

Net (loss) income per share attributable to common stockholders, basic	$	(1.89	)	$	0.21	$	0.23

Net (loss) income per share attributable to common stockholders, diluted	$	(1.89	)	$	0.18	$	0.19

The computation of diluted (loss) income per share does not include shares that are anti-dilutive under the treasury stock method because their exercise prices are higher than the average fair value of the Company’s stock during the year. For the year ended December 31, 2017, there were 10.2 million potentially anti-dilutive shares, which were excluded from the computation of (loss) income per share. For the year ended December 31, 2016, there were no anti-dilutive shares excluded from the computation of (loss) income per share. For the year ended December 31, 2015, there were 0.8 million potentially anti-dilutive shares, which were excluded from the computation of (loss) income per share.

Retirement Benefits

12 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Retirement Benefits

15. Retirement benefits

The Company sponsors a 401(k)-profit sharing plan (the “Plan”) for all eligible U.S. employees. This Plan allows eligible employees to contribute up to 80% of their compensation to the Plan. The Company makes discretionary matching contributions to the Plan provided the employee is employed on the last day of the year. Such discretionary contributions vest ratably over five years of service. The Company’s contributions to the Plan were $1.1 million, $1.1 million and $0.9 million for the years ended December 31, 2017, 2016 and 2015, respectively.

The Company also participates in government-mandated retirement and/or termination indemnity plans, benefiting certain non-U.S. employees. Termination benefits are generally lump sum payments based upon an individual’s years of credited service and annual salary at retirement. These plans are generally unfunded and employees receive payments at the time of retirement or termination under applicable labor laws or agreements. The amount of net benefit cost recorded in the consolidated statements of operations for these plans was $1.2 million, $0.9 million and $0.6 million in 2017, 2016 and 2015, respectively. The amount of benefits paid under these plans was $0.2 million, $0.2 million and $0.1 million in 2017, 2016 and 2015, respectively. The accumulated benefit obligation, unlike the projected benefit obligation, does not reflect expected benefit increases from future salary levels, and was $5.5 million and $3.0 million at December 31, 2017 and 2016, respectively, under these plans. The liability for pension benefits representing the projected benefit obligation, net of plan assets of $0.9 million and $0.7 million, under these plans was $8.0 million and $6.3 million at December 31, 2017 and 2016, respectively. A summary of the components of the pension benefits obligation recorded in the consolidated balance sheets are as follows (in thousands):


	December 31,
	2017		2016
Accrued compensation and benefits	$	368	$	332
Other long-term liabilities		7,670		5,959

	$	8,038	$	6,291

The estimated future benefit payments, which reflect expected future service, that are expected to be paid for each of the next five years are as follows (in thousands):


Year ending
December 31, 2018	$	393
December 31, 2019	$	282
December 31, 2020	$	342
December 31, 2021	$	211
December 31, 2022	$	261
Next five years	$	2,217

Accumulated Other Comprehensive Loss

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Accumulated Other Comprehensive Loss

16. Accumulated other comprehensive loss

The components of accumulated other comprehensive loss are as follows (in thousands):


	Foreign currency translation			Retirement related benefit plans			Total
Balance at December 31, 2014	$	(3,631	)	$	(710	)	$	(4,341	)
Other comprehensive loss before reclassification		(3,068	)		(217	)		(3,285	)
Tax effects		953			(36	)		917

Other comprehensive loss		(2,115	)		(253	)		(2,368	)
Less: Other comprehensive income (loss) attributable to noncontrolling interest		(1	)		—			(1	)

Balance at December 31, 2015		(5,745	)		(963	)		(6,708	)
Other comprehensive loss before reclassification		80			(771	)		(691	)
Tax effects		(60	)		195			135

Other comprehensive income (loss)		20			(576	)		(556	)
Balance at December 31, 2016		(5,725	)		(1,539	)		(7,264	)
Other comprehensive income (loss) before reclassification		2,351			(213	)		2,138
Amounts reclassified from accumulated other comprehensive loss		—			54			54
Tax effects		—			—			—

Other comprehensive income (loss)		2,351			(159	)		2,192

Balance at December 31, 2017	$	(3,374	)	$	(1,698	)	$	(5,072	)

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	17. Related party transactions In February 2017, the Company purchased the noncontrolling interest in a consolidated subsidiary from a founder stockholder for an aggregate purchase price of $29 thousand. In January 2016, the Company redeemed 350,400 shares of Class A common stock from founder stockholders for an aggregate purchase price of $1.3 million payable in twelve equal monthly installments. In June 2016, the Company redeemed 137,268 shares of Class A common stock from a related party for an aggregate purchase price of $0.5 million payable in two equal installments. In December 2016, the Company redeemed 59,108 shares of Class A common stock from a related party for an aggregate purchase price of $0.3 million payable in twelve equal monthly installments. In December 2016, the Company redeemed 113,388 shares of Class B common stock from a founder stockholder for an aggregate purchase price of $0.6 million payable in nine equal monthly installments. In October 2015, the Company acquired Altair Bellingham, LLC from significant stockholders of the Company for cash of $0.7 million, which was paid in February 2016. In 2015, the Company redeemed 200,000 shares of Class A common stock for an aggregate purchase price of $0.7 million payable in equal monthly installments of principal and interest over three years. At December 31, 2017 and 2016, respectively, the Company had obligations to related parties for the redemptions summarized above in the amounts of $0.1 million and $1.0 million recorded in other accrued expenses and current liabilities, and nil and $0.1 million recorded in other long-term liabilities. At December 31, 2017 and 2016, respectively, the Company had receivables from an equity investment for $0.5 million and $0.2 million recorded in other long-term assets.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

18. Commitments and contingencies

MSC Litigation

In July 2007, MSC Software Corporation filed a lawsuit against the Company alleging misappropriation of trade secrets, breach of confidentiality and other claims. On April 10, 2014, a jury returned a verdict against the Company. The Company challenged the verdict and on November 13, 2014, a judge vacated all but $0.4 million of the judgment and ordered a new trial on damages. On August 21, 2017, the court granted Altair’s motion to strike the testimony of MSC’s damage expert and on October 11, 2017, the court mooted the remaining pre-trial motions and allowed the Company to file a motion for summary judgment on the issue of whether MSC can prove damages. On December 13, 2017, the court granted Altair’s motion for summary judgment and dismissed MSC’s claim of trade secret misappropriation. On January 5, 2018, MSC filed a notice of appeal of the final judgment entered on December 13, 2017 and prior orders in this action to the Sixth Circuit Court of Appeals. On January 19, 2018, Altair filed a cross-appeal. No briefing schedule or argument date has been set by the Appeals Court. The Company cannot be certain of the outcome of this matter. The Company has estimated and recorded a liability for the probable loss.

Legal proceedings

From time to time, the Company may be subject to legal proceedings and claims in the ordinary course of business. The Company has received, and may in the future continue to receive, claims from third parties asserting, among other things, infringement of their intellectual property rights. Future litigation may be necessary to defend the Company, its partners and its customers by determining the scope, enforceability and validity of third party proprietary rights, or to establish and enforce the Company’s proprietary rights. The results of any current or future litigation cannot be predicted with certainty and regardless of the outcome, litigation can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources and other factors.

Royalty agreements

The Company has entered into various renewable, nonexclusive license agreements under which the Company has been granted access to the licensor’s technology and the right to sell or use the technology in the Company’s products. Royalties are payable to developers of the software at various rates and amounts, which generally are based upon unit sales or revenue. Royalty fees were $9.3 million, $7.9 million, and $7.1 million for the years ended December 31, 2017, 2016 and 2015, respectively, and are reported in Cost of revenue-software and Cost of revenue—other.

Leases

The Company leases office space, vehicles, and computer equipment. Such leases, some of which are noncancelable, are set to expire at various dates. Certain of these lease arrangements contain escalation clauses whereby monthly rent increases over time.

The future minimum annual lease payments under noncancelable operating leases with an initial term in excess of one year and future minimum capital lease payments at December 31, 2017, are as follows (in thousands):


	Capital leases		Operating leases
Year Ending December 31,
2018	$	106	$	8,946
2019		60		6,919
2020		36		4,797
2021		5		2,892
2022		—		1,933
Thereafter		—		2,367

Total minimum lease payments		207	$	27,854

Less: current installments under capital lease obligations		106

Total long-term portion	$	101

Rent expense for operating leases was $9.9 million, $8.5 million and $7.7 million for the years ended December 31, 2017, 2016 and 2015, respectively.

Segment Information

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Segment Information

19. Segment information

The Company defines its operating segments as components of its business where separate financial information is available and used by the chief operating decision maker (“CODM”) in deciding how to allocate resources to its segments and in assessing performance. The Company’s CODM is its Chief Executive Officer.

The Company has identified two reportable segments for financial reporting purposes: Software and Client Engineering Services. The primary measure of segment operating performance is Adjusted EBITDA, which is defined as net (loss) income adjusted for income tax expense (benefit), interest expense, interest income and other, depreciation and amortization, stock-based compensation expense, restructuring charges, asset impairment charges and other special items as determined by management. Adjusted EBITDA includes an allocation of corporate headquarters costs.

The Software reportable segment derives revenue from the sale and lease of licenses for software products focused on the development and application of simulation technology to synthesize and optimize designs, processes and decisions for improved business performance. The Software segment also derives revenue from software support, upgrades, training and consulting services focused on product design and development expertise and analysis support from the component level up to complete product engineering at any stage of the lifecycle.

The Client Engineering Services reportable segment provides support to its customers with long-term ongoing product design and development expertise in its market segments of Solvers & Optimization, Modeling & Visualization, Industrial and Concept Design, and high-performance computing. The Company hires simulation specialists, industrial designers, design engineers, materials experts, development and test specialists, manufacturing engineers and information technology specialists for placement at customer sites for specific customer-directed assignments.

The “All other” represents innovative services and products, including toggled^®, the Company’s LED lighting business. toggled^® is focused on developing and selling next-generation solid state lighting technology along with communication and control protocols based on intellectual property for the direct replacement of fluorescent light tubes with LED lamps. Potential services and product concepts that are still in their development stages are also included in “All other.”

Inter-segment sales are not significant for any period presented. The CODM does not review asset information by segment when assessing performance, therefore no asset information is provided for reportable segments. The accounting policies of the segments are the same as those described in Note 2—Summary of significant accounting policies. The following tables are in thousands:


Year ended December 31, 2017	Software		CES		All other			Total
Revenue	$	280,214	$	46,510	$	6,609		$	333,333
Adjusted EBITDA	$	22,864	$	4,966	$	(5,313	)	$	22,517


Year ended December 31, 2016	Software		CES		All other			Total
Revenue	$	259,588	$	47,702	$	5,950		$	313,240
Adjusted EBITDA	$	29,411	$	5,425	$	(4,006	)	$	30,830


Year ended December 31, 2015	Software		CES		All other			Total
Revenue	$	242,861	$	45,075	$	6,193		$	294,129
Adjusted EBITDA	$	23,149	$	4,776	$	(4,976	)	$	22,949


	Year ended December 31,
	2017			2016			2015
Reconciliation of Adjusted EBITDA to GAAP (Loss) income before income taxes:
Adjusted EBITDA	$	22,517		$	30,830		$	22,949
Stock-based compensation expense		(47,281	)		(5,132	)		(597	)
Interest expense		(2,160	)		(2,265	)		(2,416	)
Interest income and other⁽¹⁾		2,260			249			191
Depreciation and amortization		(11,747	)		(9,980	)		(8,378	)

(Loss) income before income taxes	$	(36,411	)	$	13,702		$	11,749

₍₁₎	Includes a non-recurring adjustment for a change in estimated legal expenses resulting in $2.0 million of income for the year ended December 31, 2017.

Revenue is attributed to geographic areas based on the country of origin. The following table provides sales to external customers and long-lived assets for each of the geographic areas in which the Company operates (in thousands):


	Revenue						Long-lived assets⁽¹⁾
	Year ended December 31,						December 31,
	2017		2016		2015		2017		2016
United States	$	142,679	$	139,079	$	130,791	$	38,729	$	25,901
Other countries		6,404		6,032		4,841		116		120

Total Americas		149,083		145,111		135,632		38,845		26,021

Germany		43,751		39,470		37,549		2,802		2,660
France		18,128		15,729		14,057		2,176		2,175
Other countries		40,050		34,909		35,933		4,534		4,317

Total Europe, Middle East and Africa		101,929		90,108		87,539		9,512		9,152

Japan		33,686		33,198		26,795		2,237		879
Other countries		48,635		44,823		44,163		2,574		2,999

Total Asia Pacific		82,321		78,021		70,958		4,811		3,878

Total	$	333,333	$	313,240	$	294,129	$	53,168	$	39,051

₍₁₎	Includes property and equipment, net and definite-lived intangible assets, net.

Supplemental Quarterly Financial Information (Unaudited)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Supplemental Quarterly Financial Information (Unaudited)

20. Supplemental quarterly financial information (unaudited)

The following tables set forth selected unaudited quarterly information. The information for each of these quarters has been prepared on the same basis as the audited annual consolidated financial statements and, in the opinion of management, includes all adjustments, which consist only of normal recurring adjustments, necessary for the fair presentation of the results of operations for these periods in accordance with GAAP. This data should be read in conjunction with the Company’s audited consolidated financial statements and related notes. These quarterly operating results are not necessarily indicative of the Company’s operating results for a full year or any future period.


	Three months ended
(in thousands, except per share data)	March 31, 2017			June 30, 2017			September 30, 2017			December 31, 2017
Total revenue	$	76,882		$	81,646		$	84,938		$	89,867
Gross profit	$	50,128		$	54,728		$	58,636		$	63,250
Operating loss	$	(1,990	)	$	(7,158	)	$	(20,928	)	$	(3,181	)
Net loss	$	(2,188	)	$	(7,246	)	$	(29,626	)	$	(60,347	)
Loss per share, basic	$	(0.04	)	$	(0.14	)	$	(0.59	)	$	(1.03	)
Loss per share, diluted	$	(0.04	)	$	(0.14	)	$	(0.59	)	$	(1.03	)

	Three months ended
(in thousands, except per share data)	March 31, 2016			June 30, 2016			September 30, 2016			December 31, 2016
Total revenue	$	74,829		$	77,511		$	78,052		$	82,848
Gross profit	$	49,411		$	52,171		$	52,431		$	56,627
Operating income	$	3,632		$	3,615		$	224		$	7,976
Net income	$	1,481		$	2,472		$	314		$	5,896
Earnings per share, basic	$	0.03		$	0.05		$	0.01		$	0.12
Earnings per share, diluted	$	0.03		$	0.04		$	0.01		$	0.10

In the second, third and fourth quarters of 2017, the Company recognized stock-based compensation expense of $11.2 million, $25.3 million, and $8.0 million, respectively.

Income tax expense increased by $56.6 million for the quarter ended December 31, 2017. This increase is primarily due to a $47.0 million increase in tax expense related to the recording of a valuation allowance on the U.S. deferred tax assets, a $15.4 million increase due to the remeasurement of net deferred tax assets and liabilities as part of the Tax Act offset by other tax accounting benefits in the U.S. in the quarter.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Principles of Consolidation

Principles of consolidation

Reclassifications

Reclassifications

Certain prior period amounts included in the 2016 consolidated balance sheet and 2016 consolidated statement of cash flows have been reclassified to conform to the current year presentation.

Use of Estimates

Use of estimates

Delaware Conversion

Delaware Conversion

Foreign Currency Translation

Foreign currency translation

Revenue Recognition

Revenue recognition

Software revenue

Software component

Software related services component

Client engineering services revenue

Other revenue

Cost of Revenue

Cost of revenue

Cost of software

Cost of client engineering services

Cost of engineering services revenue consist primarily of employee compensation costs.

Cost of other

Deferred Revenue

Deferred revenue

Deferred revenue consists of customer billings or payments received in advance of the recognition of revenue and is recognized as revenue when revenue recognition criteria are met.

Cash, Cash Equivalents and Restricted Cash

Cash, cash equivalents and restricted cash


	December 31,
	2017		2016
Cash and cash equivalents	$	39,213	$	16,874
Restricted cash included in other long-term assets		365		265

Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$	39,578	$	17,139

Restricted cash represents amounts required for a contractual agreement with an insurer for the payment of potential health insurance claims, and term deposits for bank guarantees.

Accounts Receivable, Net

Accounts receivable, net


	For the year ended December 31,
	2017			2016			2015
Balance, beginning of year	$	(565	)	$	(937	)	$	(1,439	)
Provision charged to expense		(610	)		(291	)		(145	)
Write-offs, net of recoveries		414			638			536
Effects of foreign currency translation		(37	)		25			111

Balance, end of year	$	(798	)	$	(565	)	$	(937	)

Concentrations of Credit Risk

Concentrations of credit risk

Inventory

Inventory

Inventory consisted of the following (in thousands):


	December 31,
	2017		2016
Raw materials	$	—	$	52
Finished goods		1,980		1,175

Total inventory – net	$	1,980	$	1,227

Property and Equipment, Net

Property and equipment, net

Software Development Costs

Software development costs

Impairment of Long-Lived Assets

Impairment of long-lived assets

Goodwill and Other Indefinite-Lived Intangible Assets

Goodwill and other indefinite-lived intangible assets

Receivable for R&D Credit

Receivable for R&D credit

Valuation of Common Stock Prior to IPO

Valuation of common stock prior to IPO

Derivative Financial Instruments

Derivative financial instruments

Income Taxes

Income taxes

Research and Development Costs

Research and development costs

Advertising Costs

Advertising costs

Advertising costs are expensed as incurred. Advertising expenses were $3.5 million, $2.5 million and $2.2 million for the years ended December 31, 2017, 2016, and 2015, respectively.

Mezzanine Equity

Mezzanine equity

Stock-Based Compensation

Stock-based compensation

Recent Accounting Guidance

Recent accounting guidance

Accounting standards adopted

Accounting standards not yet adopted

Fair Value Measurements


Level 1—		Quoted prices in active markets for identical assets and liabilities at the measurement date;

Level 2—		Observable inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and

Level 3—		Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Reconciliation of Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported in the consolidated balance sheets that sum to the total of the amounts reported in the consolidated statements of cash flows (in thousands):


	December 31,
	2017		2016
Cash and cash equivalents	$	39,213	$	16,874
Restricted cash included in other long-term assets		365		265

Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$	39,578	$	17,139

Schedule of Allowance for Doubtful Accounts

Activity in the allowance for doubtful accounts was as follows (in thousands):


	For the year ended December 31,
	2017			2016			2015
Balance, beginning of year	$	(565	)	$	(937	)	$	(1,439	)
Provision charged to expense		(610	)		(291	)		(145	)
Write-offs, net of recoveries		414			638			536
Effects of foreign currency translation		(37	)		25			111

Balance, end of year	$	(798	)	$	(565	)	$	(937	)

Schedule of Inventory

Inventory consisted of the following (in thousands):


	December 31,
	2017		2016
Raw materials	$	—	$	52
Finished goods		1,980		1,175

Total inventory – net	$	1,980	$	1,227

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Summary of Changes in the Fair Value of Company's Level 3 Financial Liabilities

The following table sets forth a summary of the changes in the fair value of the Company’s Level 3 financial liabilities (in thousands):


	Liability for Class A redeemable common shares			Liability for stock-based compensation awards
Balance at December 31, 2015		6,692			11,033
Shares issued upon exercise of stock options		1,841			—
Repurchase of shares		(79	)		—
Exercise of stock options		—			(2,084	)
Forfeitures of stock options		—			(110	)
Change in fair value		2,178			2,765

Balance at December 31, 2016		10,632			11,604
Exercise of stock options		432			(411	)
Forfeitures of stock options		—			(157	)
Change in fair value		19,223			25,191
Modification to stock options as a result of the Company’s IPO⁽¹⁾		(30,287	)		(36,227	)

Balance at December 31, 2017	$	—		$	—

₍₁₎

Acquisitions (Tables)

12 Months Ended

Dec. 31, 2017

Runtime [Member]

Summary of Amounts of Identified Assets Acquired and Liabilities Assumed at the Acquisition Date

The following table summarizes the consideration transferred to acquire Runtime and the amounts of identified assets acquired and liabilities assumed at the acquisition date (in thousands):


Fair value of consideration transferred	$	25,691

Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash		564
Accounts receivable		2,257
Deferred tax assets		1,713
Other assets		257
Trade names		440
Developed technology (4-year life)		7,870
Customer relationships (7-year life)		2,490
Accounts payable and other liabilities		(1,000	)
Deferred revenue		(1,925	)
Deferred tax liabilities		(4,454	)

Total net identifiable assets acquired and liabilities assumed		8,212

Goodwill	$	17,479

Carriots [Member]

Summary of Amounts of Identified Assets Acquired and Liabilities Assumed at the Acquisition Date

The following table summarizes the consideration transferred to acquire Carriots and the amounts of identified assets acquired and liabilities assumed at the acquisition date (in thousands):


Fair value of consideration transferred	$	6,657

Recognized amounts of identifiable assets acquired and liabilities assumed:
Deferred tax assets		394
Other assets		472
Trade names		252
Developed technology (4-year life)		1,317
Customer relationships (7-year life)		296
Accounts payable and other liabilities		(1,015	)

Total net identifiable assets acquired and liabilities assumed		1,716

Goodwill	$	4,941

CEDRAT [Member]

Summary of Amounts of Identified Assets Acquired and Liabilities Assumed at the Acquisition Date

The following table summarizes the consideration transferred to acquire CEDRAT and the amounts of identified assets acquired and liabilities assumed at the acquisition date (in thousands):


Fair value of consideration transferred	$	5,122

Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash	$	363
Accounts receivable		542
Income tax receivable		995
Other assets		206
Trade names		269
Developed technology (4-year life)		1,085
Customer relationships (7-year life)		938
Accounts payable and other liabilities		(2,742	)
Deferred revenue		(290	)

Total net identifiable assets acquired and liabilities assumed		1,366

Goodwill⁽¹⁾	$	3,756

₍₁₎	The goodwill included $3.5 million that was tax deductible.

Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Summary of Property and Equipment

Property and equipment consists of the following (in thousands):


	Estimated useful lives		December 31,
	Estimated useful lives		2017			2016
Land		Indefinite	$	7,994		$	7,994
Building and improvements		5-39 years		15,185			14,956
Computer equipment and software		3-5 years		32,103			27,461
Office furniture and equipment		5-15 years		6,751			5,306
Leasehold improvements		⁽¹⁾		6,467			5,397

Total property and equipment				68,500	⁽²⁾		61,114	⁽²⁾
Less: accumulated depreciation and amortization				37,054			31,406

Property and equipment, net			$	31,446		$	29,708

₍₁₎	Shorter of lease term or estimated useful life, generally ranging from five to ten years.

₍₂₎	Equipment under capital lease obligations had an original carrying value of approximately $1.1 million and $1.4 million at December 31, 2017 and 2016, respectively.

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill Attributable to Software Reporting Segment

The changes in the carrying amount of goodwill, which is attributable to the Software reporting segment, are as follows (in thousands):


Balance at December 31, 2014	$	28,859
Acquisitions		2,897
Effects of foreign currency translation		(2,516	)

Balance at December 31, 2015		29,240
Acquisitions		7,855
Effects of foreign currency translation		(470	)

Balance at December 31, 2016		36,625
Acquisitions		22,420
Effects of foreign currency translation		3,661

Balance at December 31, 2017	$	62,706

Summary of Other Intangible Assets

A summary of other intangible assets is shown below (in thousands):


	December 31, 2017
	Weighted average amortization period		Gross carrying amount		Accumulated amortization		Net carrying amount
Definite-lived intangible assets:
Developed technology		4 years	$	25,947	$	9,909	$	16,038
Customer relationships		7 years		11,794		6,195		5,599
Noncompete agreements		5 years		824		824		—
Other intangibles		10 years		143		57		86

Total definite-lived intangible assets				38,708		16,985		21,723

Indefinite-lived intangible assets:
Trade names				2,738				2,738

Total other intangible assets			$	41,446	$	16,985	$	24,461


	December 31, 2016
	Weighted average amortization period		Gross carrying amount		Accumulated amortization		Net carrying amount
Definite-lived intangible assets:
Developed technology		4 years	$	10,631	$	5,034	$	5,597
Customer relationships		7 years		8,646		4,977		3,669
Noncompete agreements		5 years		824		824		—
Other intangibles		10 years		117		40		77

Total definite-lived intangible assets				20,218		10,875		9,343

Indefinite-lived intangible assets:
Trade names				1,825				1,825

Total other intangible assets			$	22,043	$	10,875	$	11,168

Summary of Estimated Amortization Expense

Estimated amortization expense for the next five years as of December 31, 2017 is as follows (in thousands):


Year ending
December 31, 2018	$	6,692
December 31, 2019	$	5,653
December 31, 2020	$	5,015
December 31, 2021	$	2,931
December 31, 2022	$	639

Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Carrying Value of Debt

The carrying value of debt is as follows (in thousands):


	December 31,
	2017		2016
Prior Credit Agreement:
Revolving Credit Facility	$	—	$	27,355
Term Loan A		—		57,500
Obligations held under capital leases (Note 18)		207		196
Other borrowings		203		330

Total debt		410		85,381
Less: unamortized debt issuance costs		—		140
Less: current portion of long-term debt		232		10,435

Long-term debt, net of current portion	$	178	$	74,806

Scheduled Maturities of Long Term Debt

At December 31, 2017, future maturities of long-term debt, excluding capital leases, were as follows (in thousands):


Year ending December 31,
2018	$	126
2019		77
2020		—
2021		—
2022		—

Total	$	203

Other Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Other Liabilities Disclosure [Abstract]

Summary of Other Accrued Expenses and Current Liabilities

The following table provides the details of other accrued expenses and current liabilities (in thousands):


	December 31,
	2017		2016
Accrued VAT	$	3,916	$	3,928
Income taxes payable		3,724		2,156
Accrued professional fees		2,500		1,389
Accrued royalties		2,037		1,583
Non-income tax liabilities		1,343		739
Defined contribution plan liabilities		1,274		1,139
Billings in excess of cost		832		1,021
Related party liabilities		119		1,045
Other current liabilities		5,999		3,296

Total	$	21,744	$	16,296

Summary of Other Long-term Liabilities

The following table provides the details of other long-term liabilities (in thousands):


	December 31,
	2017		2016
Pension and other post retirement liabilities	$	7,670	$	5,959
Deferred tax liabilities		1,620		1,379
Other liabilities		8,357		9,776

Total	$	17,647	$	17,114

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Weighted Average Assumptions to Calculate Fair Value of Options Granted


	2017 grants		2016 grants		2015 grants
Weighted average grant date fair value per share	$	1.86-$1.94	$	1.42-$1.65	$	1.43
Expected volatility		34%		37%		37%
Expected term (in years)		5.75-6.25		5.75-6.25		6.25
Risk-free interest rate		2.02%		1.37%-1.79%		1.98%
Expected dividend yield		0%		0%		0%

Summary of Stock-Based Compensation Expense

The stock-based compensation expense was recorded as follows (in thousands):


	Year ended December 31,
	2017		2016		2015
Cost of revenue-software	$	350	$	22	$	44
Research and development		12,540		1,370		149
Sales and marketing		7,693		775		109
General and administrative		26,698		2,965		295

Total stock-based compensation expense	$	47,281	$	5,132	$	597

NSO Plan [Member]

Summary of Stock Option Activity

The following table summarizes the stock option activity under the NSO Plan:


	Number of options			Weighted average exercise price per share		Weighted average remaining contractual term (years)
Outstanding at January 1, 2017		6,458,472		$	0.000025		20 years
Granted		—			—
Exercised		(16,500	)	$	—
Forfeited		—		$	—

Outstanding at December 31, 2017		6,441,972		$	0.000025		19 years

Exercisable at December 31, 2017		6,441,972		$	0.000025		19 years

ISO Plan [Member]

Summary of Stock Option Activity

The following table summarizes the stock option activity under the 2001 Stock-based compensation plans for the periods indicated as follows:


	Number of options			Weighted average exercise price per share		Weighted average remaining contractual term (years)
Outstanding at January 1, 2017		2,972,744		$	0.64		3.4
Granted		—			—
Exercised⁽¹⁾		(2,070,916	)	$	0.63
Forfeited		(12,964	)	$	0.53

Outstanding at December 31, 2017		888,864		$	0.67		2.5

Exercisable at December 31, 2017		888,864		$	0.67		2.5

₍₁₎	Includes 1.7 million stock options exercised in connection with the Company’s IPO.

2012 Plan [Member]

Summary of Stock Option Activity

The following table summarizes the stock option activity under the 2012 Plan for the periods indicated as follows:


	Number of options			Weighted average exercise price per share		Weighted average remaining contractual term (years)
Outstanding at January 1, 2017		1,797,252		$	3.13		7.5
Granted		608,948		$	5.18
Exercised		(189,492	)	$	2.60
Forfeited		(33,581	)	$	3.89

Outstanding at December 31, 2017		2,183,127		$	3.74		7.3

Exercisable at December 31, 2017		1,240,692		$	3.01		6.2

Other Expense (Income), Net (Tables)

12 Months Ended

Dec. 31, 2017

Other Income and Expenses [Abstract]

Schedule of Other Expense (Income), Net

Other expense (income), net consists of the following (in thousands):


	Year ended December 31,
	2017			2016			2015
Foreign exchange (gain) loss	$	1,254		$	(271	)	$	973
Other		(260	)		(249	)		(191	)

Other expense (income), net	$	994		$	(520	)	$	782

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Components of (Loss) Income Before Income Taxes

The components of (loss) income before income taxes are as follows (in thousands):


	Year ended December 31,
	2017			2016			2015
U.S.	$	(49,761	)	$	(2,225	)	$	(6,861	)
Non-U.S.		13,350			15,927			18,610

	$(36,411)			$13,702			$11,749

Schedule of Significant Components of Income Tax Expense

The significant components of the income tax expense are as follows (in thousands):


	Year ended December 31,
	2017			2016			2015
Current
U.S. Federal	$	—		$	—		$	—
Non-U.S.		10,290			9,413			9,893
U.S. State and Local		135			202			56

Total current		10,425			9,615			9,949

Deferred
U.S. Federal		54,130			(5,358	)		(8,445	)
Non-U.S.		(1,306	)		(610	)		(587	)
U.S. State and Local		(253	)		(108	)		(99	)

Total deferred		52,571			(6,076	)		(9,131	)

Income tax expense	$	62,996		$	3,539		$	818

Reconciliation of Income Taxes Calculated at U.S. Federal Statutory Income Tax Rate

The reconciliation of income taxes calculated at the U.S. Federal statutory income tax rate of 35% to income tax expense is as follows (in thousands):


	Year ended December 31,
	2017			2016			2015
Income taxes at U.S. federal statutory rate	$	(12,744	)	$	4,796		$	4,117
Foreign income taxes at rates other than the federal statutory rate		373			(584	)		(10	)
U.S. state and local income taxes, net of U.S. federal tax benefit		(155	)		94			(47	)
U.S. Tax Cut and Jobs Act: transition tax, net of foreign tax credits		4,187			—			—
Change in valuation allowance		47,429			—			—
Foreign withholding taxes		4,181			4,235			3,790
Foreign dividends		—			5,077			4,152
U.S. foreign tax credit		(4,154	)		(8,786	)		(9,808	)
Research and development tax credit		(2,999	)		(2,696	)		(1,608	)
Domestic production activities deduction		—			(840	)		(833	)
Non-deductible stock-based compensation		10,871			2,064			234
Meals & entertainment		358			235			258
Other		(163	)		(91	)		125
Deferred tax on investment in subsidiary		—			(264	)		(214	)
Uncertain tax position		446			299			662
Tax law changes		15,366			—			—

Income tax expense	$	62,996		$	3,539		$	818

Schedule of Deferred Tax Assets and Liabilities


	December 31,
	2017			2016
Deferred tax assets:
Deferred revenue	$	19,569		$	16,966
Net operating loss carryforwards		7,601			3,550
Tax credit carryforwards		22,191			17,839
Stock-based compensation		8,922			15,825
Capitalized research and development		8,798			12,492
Accrued expenses		648			1,775
Employee benefits		3,931			3,995
Other		1,905			2,527

Total gross deferred tax assets		73,565			74,969
Less: valuation allowances		(54,331	)		(4,153	)

Net deferred tax assets⁽¹⁾		19,234			70,816
Deferred tax liabilities:
Prepaid royalties		6,925			5,821
Property and equipment and intangibles		4,567			2,394
Deferred tax on investment in subsidiary		272			272
Other		739			812

Total deferred tax liabilities		12,503			9,299

Total net deferred tax assets	$	6,731		$	61,517

₍₁₎	Reflects gross amount before jurisdictional netting of deferred tax assets and liabilities.

Summary of Changes to Valuation Allowance Balance

The following table summarizes the changes to the valuation allowance balance at December 31, 2017, 2016 and 2015 (in thousands):


	December 31,
	2017		2016			2015
Beginning balance	$	4,153	$	2,452		$	2,858
Additions charged to expense		47,429		177			—
Deductions		—		(207	)		(270	)
Other		2,749		1,731			(136	)

Ending balance	$	54,331	$	4,153		$	2,452

Summary of Tax Credit Carryforwards

The following table summarizes the amount and expiration dates of operating loss and tax credit carryforwards at December 31, 2017 (in thousands):


	Expiration dates		Amounts
U.S. general business credits and loss carryforwards		2018-2037	$	24,564
Foreign loss carryforwards		indefinite		2,879
U.S. foreign tax credits		2027		2,349

Total operating loss and tax credit carryforwards			$	29,792

Summary of Operating Loss Carryforwards

The following table summarizes the amount and expiration dates of operating loss and tax credit carryforwards at December 31, 2017 (in thousands):


	Expiration dates		Amounts
U.S. general business credits and loss carryforwards		2018-2037	$	24,564
Foreign loss carryforwards		indefinite		2,879
U.S. foreign tax credits		2027		2,349

Total operating loss and tax credit carryforwards			$	29,792

Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows (in thousands):


	Year ended December 31,
	2017			2016		2015
Unrecognized tax benefits—January 1	$	5,604		$	5,305	$	4,712
Increase in unrecognized tax benefits as a result of:
Additions for tax positions of current period		634			299		826
Reductions for tax positions of prior periods		(81	)		—		(233	)

Unrecognized tax benefits—December 31	$	6,157		$	5,604	$	5,305

(Loss) Income Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Computation of Numerators and Denominators Used Basic and Diluted (Loss) Income Per Share Amounts

The following table sets forth the computation of the numerators and denominators used in the basic and diluted (loss) income per share amounts (in thousands, except per share data):


	Year ended December 31,
	2017			2016		2015
Numerator:
Net (loss) income	$	(99,407	)	$	10,163	$	10,931

Denominator:
Denominator for basic (loss) income per share—weighted average shares		52,466			48,852		46,609
Effect of dilutive securities, stock options		—			9,004		12,100

Denominator for dilutive (loss) income per share		52,466			57,856		58,709

Net (loss) income per share attributable to common stockholders, basic	$	(1.89	)	$	0.21	$	0.23

Net (loss) income per share attributable to common stockholders, diluted	$	(1.89	)	$	0.18	$	0.19

Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Schedule of Pension Benefits Obligation Recorded in Consolidated Balance Sheets

A summary of the components of the pension benefits obligation recorded in the consolidated balance sheets are as follows (in thousands):


	December 31,
	2017		2016
Accrued compensation and benefits	$	368	$	332
Other long-term liabilities		7,670		5,959

	$	8,038	$	6,291

Schedule of Estimated Future Benefit Payments

The estimated future benefit payments, which reflect expected future service, that are expected to be paid for each of the next five years are as follows (in thousands):


Year ending
December 31, 2018	$	393
December 31, 2019	$	282
December 31, 2020	$	342
December 31, 2021	$	211
December 31, 2022	$	261
Next five years	$	2,217

Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Components of Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss are as follows (in thousands):


	Foreign currency translation			Retirement related benefit plans			Total
Balance at December 31, 2014	$	(3,631	)	$	(710	)	$	(4,341	)
Other comprehensive loss before reclassification		(3,068	)		(217	)		(3,285	)
Tax effects		953			(36	)		917

Other comprehensive loss		(2,115	)		(253	)		(2,368	)
Less: Other comprehensive income (loss) attributable to noncontrolling interest		(1	)		—			(1	)

Balance at December 31, 2015		(5,745	)		(963	)		(6,708	)
Other comprehensive loss before reclassification		80			(771	)		(691	)
Tax effects		(60	)		195			135

Other comprehensive income (loss)		20			(576	)		(556	)
Balance at December 31, 2016		(5,725	)		(1,539	)		(7,264	)
Other comprehensive income (loss) before reclassification		2,351			(213	)		2,138
Amounts reclassified from accumulated other comprehensive loss		—			54			54
Tax effects		—			—			—

Other comprehensive income (loss)		2,351			(159	)		2,192

Balance at December 31, 2017	$	(3,374	)	$	(1,698	)	$	(5,072	)

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Payments under Noncancelable Operating Leases


	Capital leases		Operating leases
Year Ending December 31,
2018	$	106	$	8,946
2019		60		6,919
2020		36		4,797
2021		5		2,892
2022		—		1,933
Thereafter		—		2,367

Total minimum lease payments		207	$	27,854

Less: current installments under capital lease obligations		106

Total long-term portion	$	101

Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

The following tables are in thousands:


Year ended December 31, 2017	Software		CES		All other			Total
Revenue	$	280,214	$	46,510	$	6,609		$	333,333
Adjusted EBITDA	$	22,864	$	4,966	$	(5,313	)	$	22,517


Year ended December 31, 2016	Software		CES		All other			Total
Revenue	$	259,588	$	47,702	$	5,950		$	313,240
Adjusted EBITDA	$	29,411	$	5,425	$	(4,006	)	$	30,830


Year ended December 31, 2015	Software		CES		All other			Total
Revenue	$	242,861	$	45,075	$	6,193		$	294,129
Adjusted EBITDA	$	23,149	$	4,776	$	(4,976	)	$	22,949

Reconciliation of U.S. Gaap (Loss) Income Before Income Taxes to Adjusted EBITDA


	Year ended December 31,
	2017			2016			2015
Reconciliation of Adjusted EBITDA to GAAP (Loss) income before income taxes:
Adjusted EBITDA	$	22,517		$	30,830		$	22,949
Stock-based compensation expense		(47,281	)		(5,132	)		(597	)
Interest expense		(2,160	)		(2,265	)		(2,416	)
Interest income and other⁽¹⁾		2,260			249			191
Depreciation and amortization		(11,747	)		(9,980	)		(8,378	)

(Loss) income before income taxes	$	(36,411	)	$	13,702		$	11,749

₍₁₎	Includes a non-recurring adjustment for a change in estimated legal expenses resulting in $2.0 million of income for the year ended December 31, 2017.

Summary of Sales to External Customers and Long-Lived Assets by Geographical Areas


	Revenue						Long-lived assets⁽¹⁾
	Year ended December 31,						December 31,
	2017		2016		2015		2017		2016
United States	$	142,679	$	139,079	$	130,791	$	38,729	$	25,901
Other countries		6,404		6,032		4,841		116		120

Total Americas		149,083		145,111		135,632		38,845		26,021

Germany		43,751		39,470		37,549		2,802		2,660
France		18,128		15,729		14,057		2,176		2,175
Other countries		40,050		34,909		35,933		4,534		4,317

Total Europe, Middle East and Africa		101,929		90,108		87,539		9,512		9,152

Japan		33,686		33,198		26,795		2,237		879
Other countries		48,635		44,823		44,163		2,574		2,999

Total Asia Pacific		82,321		78,021		70,958		4,811		3,878

Total	$	333,333	$	313,240	$	294,129	$	53,168	$	39,051

₍₁₎	Includes property and equipment, net and definite-lived intangible assets, net.

Supplemental Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Summary of Quarterly Financial Information


	Three months ended
(in thousands, except per share data)	March 31, 2017			June 30, 2017			September 30, 2017			December 31, 2017
Total revenue	$	76,882		$	81,646		$	84,938		$	89,867
Gross profit	$	50,128		$	54,728		$	58,636		$	63,250
Operating loss	$	(1,990	)	$	(7,158	)	$	(20,928	)	$	(3,181	)
Net loss	$	(2,188	)	$	(7,246	)	$	(29,626	)	$	(60,347	)
Loss per share, basic	$	(0.04	)	$	(0.14	)	$	(0.59	)	$	(1.03	)
Loss per share, diluted	$	(0.04	)	$	(0.14	)	$	(0.59	)	$	(1.03	)

	Three months ended
(in thousands, except per share data)	March 31, 2016			June 30, 2016			September 30, 2016			December 31, 2016
Total revenue	$	74,829		$	77,511		$	78,052		$	82,848
Gross profit	$	49,411		$	52,171		$	52,431		$	56,627
Operating income	$	3,632		$	3,615		$	224		$	7,976
Net income	$	1,481		$	2,472		$	314		$	5,896
Earnings per share, basic	$	0.03		$	0.05		$	0.01		$	0.12
Earnings per share, diluted	$	0.03		$	0.04		$	0.01		$	0.10

Description of Business - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2017	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Aggregate proceeds from IPO		$ 119,268
IPO [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Entity incorporation state		Delaware
Number of shares issued and sold	9,865,004
Price per share	$ 13.00
Aggregate proceeds from IPO	$ 119,300
Stock issuance, offering costs	$ 4,800
Number of shares of common stock sold	3,934,996
IPO [Member] \| Class A Common Stock [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Shares issued upon conversion	2,200,000
IPO [Member] \| Class A Common Stock [Member] \| Chief Executive Officer [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of stock options exercised	1,734,996

Summary of Significant Accounting Policies - Additional Information (Detail)			3 Months Ended	12 Months Ended
	Oct. 05, 2017 $ / shares shares	Apr. 03, 2017 shares	Jun. 30, 2017 $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Accounting Policies [Line Items]
Stock split ratio	4
Common stock, par value \| $ / shares	$ 0.0001
Common stock conversion description				On October 5, 2017, the Company became a Delaware corporation and effected a four-for-one stock split of its common stock. On the effective date of the Company becoming a Delaware corporation, (i) each share of outstanding common stock was increased to four shares of common stock, par value $0.0001 per share, (ii) the number of shares of common stock issuable under each outstanding option to purchase common stock was increased on a four-for-one basis, (iii) the exercise price of each outstanding option to purchase common stock was reduced on a four-for-one basis, and (iv) the redemption price of each outstanding put option was reduced on a four-for-one basis. All share and per share information referenced throughout the consolidated financial statements and notes thereto have been retroactively adjusted to reflect this stock split.
Software license arrangement term				12 months
Allowance for doubtful accounts \| $				$ 798,000	$ 565,000	$ 937,000	$ 1,439,000
Number of individual customer accounted for 10% or more of revenue				0	0	0
Impairment losses \| $				$ 0	$ 0	$ 0
Advertising expenses \| $				$ 3,500,000	$ 2,500,000	$ 2,200,000
Ministry of the Economy, Finance and Industry, France [Member] \| Research and Development Tax Credit Carryforward [Member]
Accounting Policies [Line Items]
Tax credit carryforward, period				3 years
Tax credit carryforward \| $				$ 10,200,000
Income tax receivable [Member] \| Ministry of the Economy, Finance and Industry, France [Member] \| Research and Development Tax Credit Carryforward [Member]
Accounting Policies [Line Items]
Tax credit carryforward \| $				3,300,000
Other long-term assets [Member] \| Ministry of the Economy, Finance and Industry, France [Member] \| Research and Development Tax Credit Carryforward [Member]
Accounting Policies [Line Items]
Tax credit carryforward \| $				$ 6,900,000
Preferred Stock [Member]
Accounting Policies [Line Items]
Capital units authorized \| shares	45,000,000
Product Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Automotive Industry [Member]
Accounting Policies [Line Items]
Concentration of credit risk, percentage				50.00%	50.00%	51.00%
Class B Common Stock [Member]
Accounting Policies [Line Items]
Common stock, par value \| $ / shares				$ 0.0001	$ 0.0001
Common stock conversion \| shares	2,495,752	1
Capital units authorized \| shares	41,203,428			41,203,428
Class B Common Stock [Member] \| Maximum [Member]
Accounting Policies [Line Items]
Percentage of stock held by holders	3.00%
Class A Common Stock [Member]
Accounting Policies [Line Items]
Common stock, par value \| $ / shares				$ 0.0001	$ 0.0001
Common stock conversion \| shares		1
Capital units authorized \| shares	513,796,572			513,796,572
Put right exercise period from date of purchase			5 years
Class A Common Stock [Member] \| Put Option [Member]
Accounting Policies [Line Items]
Shares issued \| shares			200,000
Put right, exercise price \| $ / shares			$ 12.50

Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Cash and cash equivalents	$ 39,213	$ 16,874
Restricted cash included in other long-term assets	365	265
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$ 39,578	$ 17,139	$ 14,013	$ 17,541

Summary of Significant Accounting Policies - Schedule of Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Balance, beginning of year	$ (565)	$ (937)	$ (1,439)
Provision charged to expense	(610)	(291)	(145)
Write-offs, net of recoveries	414	638	536
Effects of foreign currency translation	(37)	25	111
Balance, end of year	$ (798)	$ (565)	$ (937)

Summary of Significant Accounting Policies - Schedule of Inventory (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials		$ 52
Finished goods	$ 1,980	1,175
Total inventory - net	$ 1,980	$ 1,227

Fair Value Measurements - Summary of Changes in the Fair Value of Company's Level 3 Financial Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Liability for Class A Redeemable Common Shares [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 10,632	$ 6,692
Shares issued upon exercise of stock options		1,841
Repurchase of shares		(79)
Exercise of stock options	432
Change in fair value	19,223	2,178
Modification to stock options as a result of the Company's IPO	(30,287)
Ending Balance		10,632
Liability for Stock-Based Compensation Awards [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	11,604	11,033
Exercise of stock options	(411)	(2,084)
Forfeitures of stock options	(157)	(110)
Change in fair value	25,191	2,765
Modification to stock options as a result of the Company's IPO	$ (36,227)
Ending Balance		$ 11,604

Fair Value Measurements - Summary of Changes in the Fair Value of Company's Level 3 Financial Liabilities (Parenthetical) (Detail) - Liability for Class A Redeemable Common Shares [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities		$ 10,632	$ 6,692
2001 ISO and NQSO Plan [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities	$ 66,500

Acquisitions - Additional Information (Detail) - USD ($)		1 Months Ended		12 Months Ended
	Sep. 28, 2017	May 31, 2017	Apr. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Business acquisition, cash paid				$ 15,582,000	$ 6,499,000	$ 2,757,000
Goodwill				$ 62,706,000	36,625,000	29,240,000	$ 28,859,000
Runtime [Member]
Business Acquisition [Line Items]
Business acquisition, percentage of interest acquired	100.00%
Business acquisition, cash paid	$ 19,400,000
Business acquisition, notes payable	9,400,000
Business acquisition, working capital adjustment	700,000
Fair value of consideration transferred	25,691,000
Goodwill	$ 17,479,000
Runtime [Member] \| Class A Common Stock [Member]
Business Acquisition [Line Items]
Business acquisition, shares issued	708,000
Carriots [Member]
Business Acquisition [Line Items]
Business acquisition, percentage of interest acquired		100.00%
Business acquisition, cash paid		$ 3,600,000
Business acquisition, notes payable		2,700,000
Fair value of consideration transferred		6,657,000
Goodwill		$ 4,941,000
Carriots [Member] \| Class A Common Stock [Member]
Business Acquisition [Line Items]
Business acquisition, shares issued		80,000
CEDRAT [Member]
Business Acquisition [Line Items]
Business acquisition, cash paid			$ 3,700,000
Business acquisition, notes payable			1,400,000
Fair value of consideration transferred			5,122,000
Goodwill			3,756,000
Goodwill deductible for tax purposes			$ 3,500,000
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Business acquisition, cash paid					3,100,000
Business acquisition, notes payable					2,900,000
Fair value of consideration transferred					6,000,000
Intangibles					2,300,000
Goodwill					4,100,000
Goodwill deductible for tax purposes					$ 0
2015 Acquisitions [Member]
Business Acquisition [Line Items]
Business acquisition, cash paid						2,900,000
Business acquisition, notes payable						800,000
Fair value of consideration transferred						4,400,000
Intangibles						1,900,000
Goodwill						2,900,000
Goodwill deductible for tax purposes						1,000,000
Business acquisition, equity payable						$ 700,000

Acquisitions - Summary of Amounts of Identified Assets Acquired and Liabilities Assumed at the Acquisition Date (Detail) - USD ($) $ in Thousands		1 Months Ended
	Sep. 28, 2017	May 31, 2017	Apr. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill				$ 62,706	$ 36,625	$ 29,240	$ 28,859
Runtime [Member]
Business Acquisition [Line Items]
Fair value of consideration transferred	$ 25,691
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash	564
Accounts receivable	2,257
Deferred tax assets	1,713
Other assets	257
Accounts payable and other liabilities	(1,000)
Deferred revenue	(1,925)
Deferred tax liabilities	(4,454)
Total net identifiable assets acquired and liabilities assumed	8,212
Goodwill	17,479
Runtime [Member] \| Trade Names [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Indefinite-lived intangibles	440
Runtime [Member] \| Developed Technology [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Finite-lived intangibles	7,870
Runtime [Member] \| Customer Relationships [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Finite-lived intangibles	$ 2,490
Carriots [Member]
Business Acquisition [Line Items]
Fair value of consideration transferred		$ 6,657
Recognized amounts of identifiable assets acquired and liabilities assumed:
Deferred tax assets		394
Other assets		472
Accounts payable and other liabilities		(1,015)
Total net identifiable assets acquired and liabilities assumed		1,716
Goodwill		4,941
Carriots [Member] \| Trade Names [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Indefinite-lived intangibles		252
Carriots [Member] \| Developed Technology [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Finite-lived intangibles		1,317
Carriots [Member] \| Customer Relationships [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Finite-lived intangibles		$ 296
CEDRAT [Member]
Business Acquisition [Line Items]
Fair value of consideration transferred			$ 5,122
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash			363
Accounts receivable			542
Income tax receivable			995
Other assets			206
Accounts payable and other liabilities			(2,742)
Deferred revenue			(290)
Total net identifiable assets acquired and liabilities assumed			1,366
Goodwill			3,756
CEDRAT [Member] \| Trade Names [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Indefinite-lived intangibles			269
CEDRAT [Member] \| Developed Technology [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Finite-lived intangibles			1,085
CEDRAT [Member] \| Customer Relationships [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Finite-lived intangibles			$ 938

Acquisitions - Summary of Amounts of Identified Assets Acquired and Liabilities Assumed at the Acquisition Date (Parenthetical) (Detail) - USD ($) $ in Millions		1 Months Ended		12 Months Ended
	Sep. 28, 2017	May 31, 2017	Apr. 30, 2016	Dec. 31, 2017	Dec. 31, 2016
CEDRAT [Member]
Business Acquisition [Line Items]
Goodwill deductible for tax purposes			$ 3.5
Developed Technology [Member]
Business Acquisition [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets				4 years	4 years
Developed Technology [Member] \| Runtime [Member]
Business Acquisition [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets	4 years
Developed Technology [Member] \| Carriots [Member]
Business Acquisition [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets		4 years
Developed Technology [Member] \| CEDRAT [Member]
Business Acquisition [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets			4 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets				7 years	7 years
Customer Relationships [Member] \| Runtime [Member]
Business Acquisition [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets	7 years
Customer Relationships [Member] \| Carriots [Member]
Business Acquisition [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets		7 years
Customer Relationships [Member] \| CEDRAT [Member]
Business Acquisition [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets			7 years

Property and Equipment, Net - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 68,500	$ 61,114
Less: accumulated depreciation and amortization	37,054	31,406
Property and equipment, net	$ 31,446	29,708
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	Indefinite
Total property and equipment	$ 7,994	7,994
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 15,185	14,956
Building and Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	5 years
Building and Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	39 years
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 32,103	27,461
Computer Equipment and Software [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Computer Equipment and Software [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	5 years
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 6,751	5,306
Office Furniture and Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	5 years
Office Furniture and Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	15 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 6,467	$ 5,397
Leasehold Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	5 years
Leasehold Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	10 years

Property and Equipment, Net - Summary of Property and Equipment (Parenthetical) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Leasehold Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	5 years
Leasehold Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	10 years
Equipment [Member]
Property, Plant and Equipment [Line Items]
Carrying value of equipment under capital lease obligation	$ 1.1	$ 1.4

Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Purchase of property, plant and equipment	$ 4.0
Depreciation expense, including amortization of assets under capital lease		$ 6.3	$ 6.7	$ 5.8

Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill Attributable to Software Reporting Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning Balance	$ 36,625	$ 29,240	$ 28,859
Acquisitions	22,420	7,855	2,897
Effects of foreign currency translation	3,661	(470)	(2,516)
Ending Balance	$ 62,706	$ 36,625	$ 29,240

Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Summary Of Other Intangible Assets [Line Items]
Gross carrying amount	$ 41,446	$ 22,043
Accumulated amortization	16,985	10,875
Net carrying amount	24,461	11,168
Gross carrying amount	38,708	20,218
Accumulated amortization	16,985	10,875
Net carrying amount	$ 21,723	$ 9,343
Developed Technology [Member]
Summary Of Other Intangible Assets [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets	4 years	4 years
Gross carrying amount	$ 25,947	$ 10,631
Accumulated amortization	9,909	5,034
Net carrying amount	$ 16,038	$ 5,597
Customer Relationships [Member]
Summary Of Other Intangible Assets [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets	7 years	7 years
Gross carrying amount	$ 11,794	$ 8,646
Accumulated amortization	6,195	4,977
Net carrying amount	$ 5,599	$ 3,669
Noncompete Agreements [Member]
Summary Of Other Intangible Assets [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets	5 years	5 years
Gross carrying amount	$ 824	$ 824
Accumulated amortization	$ 824	$ 824
Other Intangibles [Member]
Summary Of Other Intangible Assets [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets	10 years	10 years
Gross carrying amount	$ 143	$ 117
Accumulated amortization	57	40
Net carrying amount	86	77
Trade Names [Member]
Summary Of Other Intangible Assets [Line Items]
Net carrying amount	$ 2,738	$ 1,825

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 5,448	$ 3,322	$ 2,624

Goodwill and Other Intangible Assets - Summary of Estimated Amortization Expense (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
December 31, 2018	$ 6,692
December 31, 2019	5,653
December 31, 2020	5,015
December 31, 2021	2,931
December 31, 2022	$ 639

Debt - Schedule of Carrying Value of Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total debt	$ 410	$ 85,381
Less: unamortized debt issuance costs		140
Less: current portion of long-term debt	232	10,435
Long-term debt, net of current portion	178	74,806
Term Loan A [Member]
Debt Instrument [Line Items]
Total debt		57,500
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Total debt	207	196
Other Borrowings [Member]
Debt Instrument [Line Items]
Total debt	$ 203	330
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt		$ 27,355

Debt - Additional Information (Detail) - USD ($)			12 Months Ended
Debt - Additional Information (Detail) - USD ($)	Nov. 03, 2017	Oct. 19, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Oct. 18, 2017
Debt Instrument [Line Items]
Payments on long-term debt			$ 59,869,000	$ 16,232,000	$ 15,950,000
Overdraft and Line of Credit [Member]
Debt Instrument [Line Items]
Amount available under secured credit agreement			3,500,000	3,500,000
Loan outstanding			0	0
Secured Credit Agreement [Member]
Debt Instrument [Line Items]
Payments on long-term debt	$ 93,100,000
Secured Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member]
Debt Instrument [Line Items]
Loan outstanding			0
Amount available for future borrowing			100,000,000
Secured Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member] \| Term Loan A [Member]
Debt Instrument [Line Items]
Amount available under secured credit agreement						$ 65,000,000
Loan outstanding				$ 57,500,000
Interest rate				2.60%
Quarterly principal payments			$ 2,500,000
Maturity date			Apr. 18, 2019
Frequency of periodic payment			Quarterly
Secured Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount available under secured credit agreement						60,000,000
Loan outstanding				$ 27,400,000
Amount available for future borrowing				$ 32,600,000
Termination date				2019-04
Weighted-average interest rate				2.60%
Secured Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member] \| Revolving Credit Facility [Member] \| Swingline Subfacility and Letter of Credit Subfacility [Member]
Debt Instrument [Line Items]
Amount available under secured credit agreement						$ 5,000,000
2017 Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member]
Debt Instrument [Line Items]
Aggregate commitment amount under credit facility		$ 100,000,000
Maturity date		Oct. 18, 2022
Amount available under secured credit agreement		$ 150,000,000
Increase in line of credit borrowing capacity		$ 50,000,000
Maximum leverage ratio		3.00%
Increase in unrestricted domestic cash		$ 20,000,000
2017 Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member] \| Swingline Loans [Member]
Debt Instrument [Line Items]
Aggregate commitment amount under credit facility		$ 5,000,000
2017 Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member] \| Federal Funds Effective Swap Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		0.50%
2017 Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.00%
2017 Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Commitment fees on unused portion of the Revolving Credit Facility			0.15%
EBITDA to cash Consolidated Interest Expense ratio		3.00%
2017 Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member] \| Minimum [Member] \| Swingline Loans [Member]
Debt Instrument [Line Items]
Applicable margin for borrowings under new credit facility		0.25%
2017 Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member] \| Minimum [Member] \| Eurodollar Loans [Member]
Debt Instrument [Line Items]
Applicable margin for borrowings under new credit facility		1.25%
2017 Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Commitment fees on unused portion of the Revolving Credit Facility			0.30%
2017 Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member] \| Maximum [Member] \| Swingline Loans [Member]
Debt Instrument [Line Items]
Applicable margin for borrowings under new credit facility		1.00%
2017 Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member] \| Maximum [Member] \| Eurodollar Loans [Member]
Debt Instrument [Line Items]
Applicable margin for borrowings under new credit facility		2.00%
2017 Credit Agreement [Member] \| JPMorgan Chase Bank, N.A. [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Aggregate commitment amount under credit facility		$ 5,000,000

Debt - Scheduled Maturities of Long Term Debt (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Maturities of Long-term Debt [Abstract]
2018	$ 126
2019	77
2020	0
2021	0
2022	0
Total	$ 203

Other Liabilities - Summary of Other Accrued Expenses and Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Accrued VAT	$ 3,916	$ 3,928
Income taxes payable	3,724	2,156
Accrued professional fees	2,500	1,389
Accrued royalties	2,037	1,583
Non-income tax liabilities	1,343	739
Defined contribution plan liabilities	1,274	1,139
Billings in excess of cost	832	1,021
Related party liabilities	119	1,045
Other current liabilities	5,999	3,296
Total	$ 21,744	$ 16,296

Other Liabilities - Summary of Other Long-term Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Pension and other post retirement liabilities	$ 7,670	$ 5,959
Deferred tax liabilities	1,620	1,379
Other liabilities	8,357	9,776
Total	$ 17,647	$ 17,114

Financial Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Other Long-term Liabilities [Member]
Derivative [Line Items]
Fair value of derivative instruments liability	$ 200,000	$ 300,000
Interest Rate Swap [Member]
Derivative [Line Items]
Derivatives outstanding notional value	$ 4,500,000	4,500,000
Derivatives maturity date	Dec. 23, 2019
Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivatives outstanding notional value	$ 0	$ 0

Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
	Oct. 05, 2017 $ / shares shares	Apr. 03, 2017 Vote shares	Feb. 29, 2016 USD ($)	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares	Apr. 04, 2017 $ / shares shares
Class of Stock [Line Items]
Preferred stock, shares authorized				45,000,000	0
Preferred stock, par value \| $ / shares				$ 0.0001	$ 0.0000
Preferred stock, shares issued				0	0
Preferred stock, shares outstanding				0	0
Common stock, par value \| $ / shares	$ 0.0001
Common stock dividends \| $ / shares				$ 0	$ 0	$ 0
Business acquisition, cash paid \| $				$ 15,582	$ 6,499	$ 2,757
Altair Bellingham Llc [Member]
Class of Stock [Line Items]
Business acquisition, cash paid \| $			$ 700
Class B Common Stock [Member]
Class of Stock [Line Items]
Capital units authorized	41,203,428			41,203,428
Common stock, par value \| $ / shares				$ 0.0001	$ 0.0001
Common stock voting rights description				Each share of the Company's Class A voting common stock, or old Class A shares, automatically converted into one share of new Class B voting common stock entitled to ten votes per share
Number of votes entitled per share				10
Conversion of stock, shares converted	2,495,752	1
Number of votes entitled to common stockholders per share \| Vote		10
Common stock, shares authorized				41,203,000	44,000,000		44,000,000
Common stock, no par value \| $ / shares
Class B Common Stock [Member] \| Prior Recapitalization [Member]
Class of Stock [Line Items]
Common stock, shares authorized		25,153,872
Common stock, no par value \| $ / shares				$ 0
Class A Common Stock [Member]
Class of Stock [Line Items]
Capital units authorized	513,796,572			513,796,572
Common stock, par value \| $ / shares				$ 0.0001	$ 0.0001
Common stock voting rights description				Each share of the Company's Class B non-voting common stock, or old Class B shares, automatically converted into one share of new Class A voting common stock entitled to one vote per share, in each case, without any further action on the part of the holders thereof.
Number of votes entitled per share				1
Conversion of stock, shares converted		1
Number of votes entitled to common stockholders per share \| Vote		1
Common stock, shares authorized				513,797,000	76,000,000		76,000,000
Common stock, no par value \| $ / shares
Class A Common Stock [Member] \| Prior Recapitalization [Member]
Class of Stock [Line Items]
Common stock, shares authorized		99,279,884
Common stock, no par value \| $ / shares				$ 0

Stock-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 27, 2017	Dec. 31, 2012	Dec. 31, 2001
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense yet to be recognized related to nonvested awards	$ 1,500		$ 1,500
Expense recognition period related to nonvested awards			2 years 9 months 18 days
Business combination, estimated post combination expense		$ 2,000
Liability for Class A Redeemable Common Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Financial liabilities				$ 10,632	$ 6,692
Class A Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding	26,725,000		26,725,000	8,900,000
NSO Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, outstanding	6,441,972		6,441,972	6,458,472				6,441,972
Exercise price stock options outstanding	$ 0.000025		$ 0.000025	$ 0.000025
Contractual term			35 years
ISO Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, outstanding	888,864		888,864	2,972,744
Exercise price stock options outstanding	$ 0.67		$ 0.67	$ 0.64
Contractual term			10 years
Shares outstanding				2,340,596
Total intrinsic value of ISO Plan stock options exercised			$ 25,600	$ 2,700
ISO Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period			2 years
ISO Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period			3 years
ISO Plan [Member] \| Class A Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized								11,153,872
2012 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, outstanding	2,183,127		2,183,127	1,797,252
Exercise price stock options outstanding	$ 3.74		$ 3.74	$ 3.13
Contractual term			10 years
Total requisite service period of awards			4 years
Compensation expense			$ 700	$ 600	$ 600
2012 Plan [Member] \| Old Class B Nonvoting Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized							5,200,000
2017 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under the plan	0
2017 Plan [Member] \| Class A Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance						6,207,976
2001 ISO and NQSO Plan [Member] \| Liability for Class A Redeemable Common Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Financial liabilities	$ 66,500		$ 66,500

Stock-based Compensation - Summary of Stock Option Activity under NSO Plan (Detail) - NSO Plan [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of options, Outstanding, Beginning Balance	6,458,472
Number of options, Granted	0
Number of options, Exercised	(16,500)
Number of options, Forfeited	0
Number of options, Outstanding, Ending Balance	6,441,972	6,458,472
Number of options, Exercisable	6,441,972
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price per share, Outstanding, Beginning Balance	$ 0.000025
Weighted average exercise price per share, Granted	0
Weighted average exercise price per share, Exercised	0
Weighted average exercise price per share, Forfeited	0
Weighted average exercise price per share, Outstanding, Ending Balance	0.000025	$ 0.000025
Weighted average exercise price per share, Exercisable	$ 0.000025
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual term (years), Outstanding	19 years	20 years
Weighted average remaining contractual term (years), Exercisable	19 years

Stock-based Compensation - Summary of Stock Option Activity under ISO Plan (Detail) - ISO Plan [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of options, Outstanding, Beginning Balance	2,972,744
Number of options, Granted	0
Number of options, Exercised	(2,070,916)
Number of options, Forfeited	(12,964)
Number of options, Outstanding, Ending Balance	888,864	2,972,744
Number of options, Exercisable	888,864
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price per share, Outstanding, Beginning Balance	$ 0.64
Weighted average exercise price per share, Granted	0
Weighted average exercise price per share, Exercised	0.63
Weighted average exercise price per share, Forfeited	0.53
Weighted average exercise price per share, Outstanding, Ending Balance	0.67	$ 0.64
Weighted average exercise price per share, Exercisable	$ 0.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual term (years), Outstanding	2 years 6 months	3 years 4 months 24 days
Weighted average remaining contractual term (years), Exercisable	2 years 6 months

Stock-based Compensation - Summary of Stock Option Activity under ISO Plan (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock options exercised	$ 1,792

Stock-based compensation - Summary of Stock Option Activity under 2012 Plan (Detail) - 2012 Plan [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of options, Outstanding, Beginning Balance	1,797,252
Number of options, Granted	608,948
Number of options, Exercised	(189,492)
Number of options, Forfeited	(33,581)
Number of options, Outstanding, Ending Balance	2,183,127	1,797,252
Number of options, Exercisable	1,240,692
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price per share, Outstanding, Beginning Balance	$ 3.13
Weighted average exercise price per share, Granted	5.18
Weighted average exercise price per share, Exercised	2.60
Weighted average exercise price per share, Forfeited	3.89
Weighted average exercise price per share, Outstanding, Ending Balance	3.74	$ 3.13
Weighted average exercise price per share, Exercisable	$ 3.01
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual term (years), Outstanding	7 years 3 months 19 days	7 years 6 months
Weighted average remaining contractual term (years), Exercisable	6 years 2 months 12 days

Stock-based Compensation - Weighted Average Assumptions To Calculate Fair Value of Options Granted (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value per share			$ 1.43
Expected volatility	34.00%	37.00%	37.00%
Expected term (in years)			6 years 2 months 30 days
Risk-free interest rate	2.02%		1.98%
Expected dividend yield	0.00%	0.00%	0.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value per share	$ 1.86	$ 1.42
Expected term (in years)	5 years 9 months	5 years 9 months
Risk-free interest rate		1.37%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value per share	$ 1.94	$ 1.65
Expected term (in years)	6 years 2 months 30 days	6 years 2 months 30 days
Risk-free interest rate		1.79%

Stock-based Compensation - Summary of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 8,000	$ 25,300	$ 11,200	$ 47,281	$ 5,132	$ 597
Cost of Revenue - Software [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense				350	22	44
Research and development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense				12,540	1,370	149
Sales and marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense				7,693	775	109
General and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense				$ 26,698	$ 2,965	$ 295

Other Expense (Income), Net - Schedule of Other Expense (Income), Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Income and Expenses [Abstract]
Foreign exchange (gain) loss	$ 1,254	$ (271)	$ 973
Other	(260)	(249)	(191)
Other expense (income), net	$ 994	$ (520)	$ 782

Income Taxes - Components of (Loss) Income Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S	$ (49,761)	$ (2,225)	$ (6,861)
Non-U.S	13,350	15,927	18,610
(Loss) income before income taxes	$ (36,411)	$ 13,702	$ 11,749

Income Taxes - Significant Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current
U.S. Federal	$ 0	$ 0	$ 0
Non-U.S.	10,290	9,413	9,893
U.S. State and Local	135	202	56
Total current	10,425	9,615	9,949
Deferred
U.S. Federal	54,130	(5,358)	(8,445)
Non-U.S.	(1,306)	(610)	(587)
U.S. State and Local	(253)	(108)	(99)
Total deferred	52,571	(6,076)	(9,131)
Income tax expense	$ 62,996	$ 3,539	$ 818

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Line Items]
U.S. Federal statutory income tax rate		35.00%
Tax cuts and job act, increase tax expense		$ 15,400
Tax cuts and job act, offset of foreign tax credits		4,200
Deferred tax assets, valuation allowance		47,429
Tax cuts and job act, deferred tax benefit		(1,300)
Tax cuts and job act, transition tax liability, net of foreign tax credits		4,187
Gross unrecognized tax benefits recognized would affect the effective tax rate		6,200
Unrecognized tax benefits related to accrued interest and penalties		100
Valuation Allowance of Deferred Tax Assets [Member]
Income Tax Disclosure [Line Items]
Additions charged to expense		$ 47,429	$ 177
Scenario, Plan [Member]
Income Tax Disclosure [Line Items]
U.S. Federal statutory income tax rate	21.00%

Income Taxes - Reconciliation of Income Taxes Calculated at U.S. Federal Statutory Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income taxes at U.S. federal statutory rate	$ (12,744)	$ 4,796	$ 4,117
Foreign income taxes at rates other than the federal statutory rate	373	(584)	(10)
U.S. state and local income taxes, net of U.S. federal tax benefit	(155)	94	(47)
U.S. Tax Cut and Jobs Act: transition tax, net of foreign tax credits	4,187
Change in valuation allowance	47,429
Foreign withholding taxes	4,181	4,235	3,790
Foreign dividends		5,077	4,152
U.S. foreign tax credit	(4,154)	(8,786)	(9,808)
Research and development tax credit	(2,999)	(2,696)	(1,608)
Domestic production activities deduction		(840)	(833)
Non-deductible stock-based compensation	10,871	2,064	234
Meals & entertainment	358	235	258
Other	(163)	(91)	125
Deferred tax on investment in subsidiary		(264)	(214)
Uncertain tax position	446	299	662
Tax law changes	15,366
Income tax expense	$ 62,996	$ 3,539	$ 818

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Deferred revenue	$ 19,569	$ 16,966
Net operating loss carryforwards	7,601	3,550
Tax credit carryforwards	22,191	17,839
Stock-based compensation	8,922	15,825
Capitalized research and development	8,798	12,492
Accrued expenses	648	1,775
Employee benefits	3,931	3,995
Other	1,905	2,527
Total gross deferred tax assets	73,565	74,969
Less: valuation allowances	(54,331)	(4,153)
Net deferred tax assets	19,234	70,816
Deferred tax liabilities:
Prepaid royalties	6,925	5,821
Property and equipment and intangibles	4,567	2,394
Deferred tax on investment in subsidiary	272	272
Other	739	812
Total deferred tax liabilities	12,503	9,299
Total net deferred tax assets	$ 6,731	$ 61,517

Income Taxes - Summary of Changes to Valuation Allowance Balance (Detail) - Valuation Allowance of Deferred Tax Assets [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation Allowance [Line Items]
Beginning balance	$ 4,153	$ 2,452	$ 2,858
Additions charged to expense	47,429	177
Deductions		(207)	(270)
Other	2,749	1,731	(136)
Ending balance	$ 54,331	$ 4,153	$ 2,452

Income Taxes - Operating Loss and Tax Credit Carryforwards (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Operating Loss and Tax Credit Carryforward [Line Items]
Foreign loss carryforwards, expiration year	indefinite
U.S. foreign tax credits, expiration year	2027
U.S. foreign tax credits	$ 2,349
Total operating loss and tax credit carryforwards	29,792
Foreign Tax Authority [Member]
Operating Loss and Tax Credit Carryforward [Line Items]
Foreign loss carryforwards	$ 2,879
General Business Tax Credit Carryforward [Member]
Operating Loss and Tax Credit Carryforward [Line Items]
U.S. general business credits and loss carryforwards, expiration year	2018-2037
Foreign loss carryforwards	$ 24,564

Income Taxes - Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Unrecognized tax benefits-January 1	$ 5,604	$ 5,305	$ 4,712
Additions for tax positions of current period	634	299	826
Reductions for tax positions of prior periods	(81)		(233)
Unrecognized tax benefits-December 31	$ 6,157	$ 5,604	$ 5,305

(Loss) Income Per Share - Computation of Numerators and Denominators Used Basic and Diluted (Loss) Income Per Share Amounts (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net (loss) income	$ (60,347)	$ (29,626)	$ (7,246)	$ (2,188)	$ 5,896	$ 314	$ 2,472	$ 1,481	$ (99,407)	$ 10,163	$ 10,931
Denominator:
Denominator for basic (loss) income per share-weighted average shares									52,466	48,852	46,609
Effect of dilutive securities, stock options										9,004	12,100
Denominator for dilutive (loss) income per share									52,466	57,856	58,709
Net (loss) income per share attributable to common stockholders, basic	$ (1.03)	$ (0.59)	$ (0.14)	$ (0.04)	$ 0.12	$ 0.01	$ 0.05	$ 0.03	$ (1.89)	$ 0.21	$ 0.23
Net (loss) income per share attributable to common stockholders, diluted	$ (1.03)	$ (0.59)	$ (0.14)	$ (0.04)	$ 0.10	$ 0.01	$ 0.04	$ 0.03	$ (1.89)	$ 0.18	$ 0.19

(Loss) Income Per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Anti-dilutive shares excluded from computation of (loss) income per share	10,200,000	0	800,000

Retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Retirement Benefits [Abstract]
Funded percentage	80.00%
Defined Benefit Plan, Contributions by Employer	$ 1.1	$ 1.1	$ 0.9
Net benefit cost	1.2	0.9	0.6
Benefit obligation benefits paid	0.2	0.2	$ 0.1
Accumulated benefit obligation	5.5	3.0
Defined benefit plan assets	0.9	0.7
Defined benefit plan funded	$ 8.0	$ 6.3

Retirement Benefits - Schedule of Pension Benefits Obligation (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Accrued compensation and benefits	$ 368	$ 332
Other long-term liabilities	7,670	5,959
Components of pension benefits	$ 8,038	$ 6,291

Retirement Benefits - Schedule of Estimated Future Benefit Payments (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
December 31, 2018	$ 393
December 31, 2019	282
December 31, 2020	342
December 31, 2021	211
December 31, 2022	261
Next five years	$ 2,217

Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (7,264)
Other comprehensive income (loss) before reclassification	2,138	$ (691)	$ (3,285)
Amounts reclassified from accumulated other comprehensive loss	54
Tax effects		135	917
Other comprehensive income (loss)	2,192	(556)	(2,368)
Less: Other comprehensive income (loss) attributable to noncontrolling interest			(1)
Ending balance	(5,072)	(7,264)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(5,725)	(5,745)	(3,631)
Other comprehensive income (loss) before reclassification	2,351	80	(3,068)
Tax effects		(60)	953
Other comprehensive income (loss)	2,351	20	(2,115)
Less: Other comprehensive income (loss) attributable to noncontrolling interest			(1)
Ending balance	(3,374)	(5,725)	(5,745)
Retirement Related Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,539)	(963)	(710)
Other comprehensive income (loss) before reclassification	(213)	(771)	(217)
Amounts reclassified from accumulated other comprehensive loss	54
Tax effects		195	(36)
Other comprehensive income (loss)	(159)	(576)	(253)
Ending balance	(1,698)	(1,539)	(963)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(7,264)	(6,708)	(4,341)
Ending balance	$ (5,072)	$ (7,264)	$ (6,708)

Related Party Transactions - Additional Information (Detail) $ in Thousands	1 Months Ended					12 Months Ended
	Feb. 28, 2017 USD ($)	Dec. 31, 2016 USD ($) Installment shares	Jun. 30, 2016 USD ($) Installment shares	Feb. 28, 2016 USD ($)	Jan. 31, 2016 USD ($) Installment shares	Dec. 31, 2017 USD ($)	Dec. 31, 2015 USD ($) Installment shares
Related Party Transaction [Line Items]
Purchase of noncontrolling interests						$ 29
Obligations to related parties, current		$ 1,045				119
Other accrued expenses and current liabilities [Member]
Related Party Transaction [Line Items]
Obligations to related parties, current		1,000				100
Other Long-term Liabilities [Member]
Related Party Transaction [Line Items]
obligations to related parties, non-current		100
Other long-term assets [Member]
Related Party Transaction [Line Items]
Receivables from equity investment		$ 200				$ 500
Founder Stockholders [Member]
Related Party Transaction [Line Items]
Purchase of noncontrolling interests	$ 29
Founder Stockholders [Member] \| Class B Common Stock [Member]
Related Party Transaction [Line Items]
Stock redeemed in shares \| shares		113,388
Stock redeemed aggregate purchase price		$ 600
Number of installments \| Installment		9
Founder Stockholders [Member] \| Class A Common Stock [Member]
Related Party Transaction [Line Items]
Stock redeemed in shares \| shares		59,108			350,400		200,000
Stock redeemed aggregate purchase price		$ 300			$ 1,300		$ 700
Number of installments \| Installment		12			12		36
Related Party [Member] \| Class A Common Stock [Member]
Related Party Transaction [Line Items]
Stock redeemed in shares \| shares			137,268
Stock redeemed aggregate purchase price			$ 500
Number of installments \| Installment			2
Altair Bellingham Llc [Member]
Related Party Transaction [Line Items]
Payment to acquire business				$ 700

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
	Nov. 13, 2014	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies [Line Items]
Damages amount on MSC litigation	$ 0.4
Rent expense for operating leases		$ 9.9	$ 8.5	$ 7.7
Minimum [Member]
Commitments and Contingencies [Line Items]
Operating lease term		1 year
Software Development [Member]
Commitments and Contingencies [Line Items]
Royalty revenues		$ 9.3	$ 7.9	$ 7.1

Commitments and Contingencies - Schedule of Future Minimum Capital Lease Payments and under Noncancelable Operating Leases (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity
Capital leases, 2018	$ 106
Capital leases, 2019	60
Capital leases, 2020	36
Capital leases, 2021	5
Capital leases, 2022	0
Capital leases, Thereafter	0
Total minimum lease payments	207
Less: current installments under capital lease obligations	106
Total long-term portion	101
Total minimum lease payments	207
Year Ending December 31,
Operating leases, 2018	8,946
Operating leases, 2019	6,919
Operating leases, 2020	4,797
Operating leases, 2021	2,892
Operating leases, 2022	1,933
Operating leases, Thereafter	2,367
Total minimum lease payments	$ 27,854

Segment Information - Additional Information (Detail)	12 Months Ended
Segment Information - Additional Information (Detail)	Dec. 31, 2017 Segment
Segment Reporting [Abstract]
Number of reportable segments	2

Segment Information - Schedule of Segment Reporting Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 89,867	$ 84,938	$ 81,646	$ 76,882	$ 82,848	$ 78,052	$ 77,511	$ 74,829	$ 333,333	$ 313,240	$ 294,129
Adjusted EBITDA									22,517	30,830	22,949
Software [Member]
Segment Reporting Information [Line Items]
Revenue									280,214	259,588	242,861
Adjusted EBITDA									22,864	29,411	23,149
Client Engineering Services [Member]
Segment Reporting Information [Line Items]
Revenue									46,510	47,702	45,075
Adjusted EBITDA									4,966	5,425	4,776
All Other [Member]
Segment Reporting Information [Line Items]
Revenue									6,609	5,950	6,193
Adjusted EBITDA									$ (5,313)	$ (4,006)	$ (4,976)

Segment Information - Reconciliation of U.S. Gaap (Loss) Income Before Income Taxes to Adjusted EBITDA (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting [Abstract]
Adjusted EBITDA				$ 22,517	$ 30,830	$ 22,949
Stock-based compensation expense	$ (8,000)	$ (25,300)	$ (11,200)	(47,281)	(5,132)	(597)
Interest expense				(2,160)	(2,265)	(2,416)
Interest income and other				2,260	249	191
Depreciation and amortization				(11,747)	(9,980)	(8,378)
(Loss) income before income taxes				$ (36,411)	$ 13,702	$ 11,749

Segment Information - Reconciliation of U.S. Gaap (Loss) Income Before Income Taxes to Adjusted EBITDA (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Segment Reporting [Abstract]
Income recognized in non-recurring adjustment for change in estimated legal expenses	$ 2.0

Segment Information - Summary of Sales to External Customers and Long-Lived Assets by Geographical Areas (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 89,867	$ 84,938	$ 81,646	$ 76,882	$ 82,848	$ 78,052	$ 77,511	$ 74,829	$ 333,333	$ 313,240	$ 294,129
Long-lived assets	53,168				39,051				53,168	39,051
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									142,679	139,079	130,791
Long-lived assets	38,729				25,901				38,729	25,901
Other American Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									6,404	6,032	4,841
Long-lived assets	116				120				116	120
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									149,083	145,111	135,632
Long-lived assets	38,845				26,021				38,845	26,021
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									43,751	39,470	37,549
Long-lived assets	2,802				2,660				2,802	2,660
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									18,128	15,729	14,057
Long-lived assets	2,176				2,175				2,176	2,175
Other Europe, Middle East and Africa Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									40,050	34,909	35,933
Long-lived assets	4,534				4,317				4,534	4,317
Europe Middle East And Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									101,929	90,108	87,539
Long-lived assets	9,512				9,152				9,512	9,152
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									33,686	33,198	26,795
Long-lived assets	2,237				879				2,237	879
Other Asia Pacific Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									48,635	44,823	44,163
Long-lived assets	2,574				2,999				2,574	2,999
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									82,321	78,021	$ 70,958
Long-lived assets	$ 4,811				$ 3,878				$ 4,811	$ 3,878

Supplemental Quarterly Financial Information (Unaudited) - Summary of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 89,867	$ 84,938	$ 81,646	$ 76,882	$ 82,848	$ 78,052	$ 77,511	$ 74,829	$ 333,333	$ 313,240	$ 294,129
Gross profit	63,250	58,636	54,728	50,128	56,627	52,431	52,171	49,411	226,742	210,640	194,921
Operating income	(3,181)	(20,928)	(7,158)	(1,990)	7,976	224	3,615	3,632	(33,257)	15,447	14,947
Net(loss)income	$ (60,347)	$ (29,626)	$ (7,246)	$ (2,188)	$ 5,896	$ 314	$ 2,472	$ 1,481	$ (99,407)	$ 10,163	$ 10,931
Earnings per share, basic	$ (1.03)	$ (0.59)	$ (0.14)	$ (0.04)	$ 0.12	$ 0.01	$ 0.05	$ 0.03	$ (1.89)	$ 0.21	$ 0.23
Earnings per share, diluted	$ (1.03)	$ (0.59)	$ (0.14)	$ (0.04)	$ 0.10	$ 0.01	$ 0.04	$ 0.03	$ (1.89)	$ 0.18	$ 0.19

Supplemental Quarterly Financial Information (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Stock-based compensation expense	$ 8,000	$ 25,300	$ 11,200	$ 47,281	$ 5,132	$ 597
Increase in income tax expense	$ 56,600
Tax cuts and job act, valuation allowance				47,429
Tax cuts and job act, increase tax expense				$ 15,400