0001564590-20-022951 | 10-Q | XBRL Viewer

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Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2017	Dec. 31, 2019
Accounting Policies [Line Items]
Inventory	$ 1,800		$ 2,400
Income tax receivable, current	$ 5,884		7,264
Class A Common Stock [Member] \| Put Option [Member]
Accounting Policies [Line Items]
Shares issued		200,000
Put right, exercise price		$ 12.50
Put right exercise period from date of purchase		5 years
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
Income tax receivable	$ 12,700		12,100
Income tax receivable, current	2,400		2,500
Income tax receivable, noncurrent	$ 10,300		$ 9,600

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 247,145	$ 223,117
Accounts receivable, net	87,665	104,984
Income tax receivable	5,884	7,264
Prepaid expenses and other current assets	16,777	17,092
Total current assets	357,471	352,457
Property and equipment, net	35,449	36,297
Operating lease right of use assets	25,321	28,134
Goodwill	229,795	233,683
Other intangible assets, net	61,358	67,075
Deferred tax assets	5,620	5,791
Other long-term assets	19,640	19,708
TOTAL ASSETS	734,654	743,145
CURRENT LIABILITIES:
Current portion of long-term debt	430	430
Accounts payable	5,625	8,585
Accrued compensation and benefits	27,623	30,676
Current portion of operating lease liabilities	8,635	9,141
Other accrued expenses and current liabilities	35,760	28,603
Deferred revenue	72,567	75,431
Total current liabilities	150,640	152,866
Long-term debt, net of current portion	180,777	178,238
Operating lease liabilities, net of current portion	17,796	20,174
Deferred revenue, non-current	7,472	8,136
Other long-term liabilities	19,472	26,672
TOTAL LIABILITIES	376,157	386,086
Commitments and contingencies
MEZZANINE EQUITY	2,352	2,352
STOCKHOLDERS’ EQUITY:
Preferred stock ($0.0001 par value), authorized 45,000 shares, none issued and outstanding
Additional paid-in capital	449,870	446,633
Accumulated deficit	(76,763)	(82,405)
Accumulated other comprehensive loss	(16,969)	(9,528)
TOTAL STOCKHOLDERS’ EQUITY	356,145	354,707
TOTAL LIABILITIES, MEZZANINE EQUITY AND STOCKHOLDERS’ EQUITY	734,654	743,145
Class A Common Stock [Member]
STOCKHOLDERS’ EQUITY:
Common stock	4	4
Class B Common Stock [Member]
STOCKHOLDERS’ EQUITY:
Common stock	$ 3	$ 3

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 6,030	$ 13,019
Other comprehensive (loss) income, net of tax:
Foreign currency translation (net of tax effect of $0 for all periods)	(7,578)	337
Retirement related benefit plans (net of tax effect of $13 and $0, respectively)	137	228
Total other comprehensive (loss) income	(7,441)	565
Comprehensive (loss) income	$ (1,411)	$ 13,584

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Other Liabilities - Summary of Other Accrued Expenses and Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Income taxes payable	$ 12,563	$ 6,008
Accrued VAT	5,101	5,312
Accrued royalties	3,811	2,314
Accrued professional fees	2,864	2,581
Obligations for acquisition of businesses	1,362	1,362
Defined contribution plan liabilities	1,103	1,593
Billings in excess of cost	744	879
Non-income tax liabilities	639	1,253
Other current liabilities	7,573	7,301
Total	$ 35,760	$ 28,603

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
OPERATING ACTIVITIES:
Net income	$ 6,030	$ 13,019
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,660	5,194
Provision for credit loss	338	120
Amortization of debt discount and issuance costs	2,653	4
Stock-based compensation expense	3,171	1,212
Deferred income taxes	(6,001)	(654)
Other, net	7
Changes in assets and liabilities:
Accounts receivable	14,463	7,678
Prepaid expenses and other current assets	1,184	(5,755)
Other long-term assets	(321)	(1,516)
Accounts payable	(3,001)	(1,792)
Accrued compensation and benefits	(2,581)	(2,815)
Other accrued expenses and current liabilities	8,580	4,093
Operating lease right-of-use assets and liabilities, net	(17)	286
Deferred revenue	(2,129)	6,241
Net cash provided by operating activities	28,036	25,315
INVESTING ACTIVITIES:
Capital expenditures	(1,644)	(4,583)
Payments for acquisition of developed technology	(433)	(344)
Other investing activities, net	62	2
Net cash used in investing activities	(2,015)	(4,925)
FINANCING ACTIVITIES:
Payments on revolving commitment		(68,395)
Borrowings under revolving commitment		52,289
Proceeds from the exercise of stock options	194	458
Other financing activities	(118)	(119)
Net cash provided by (used in) financing activities	76	(15,767)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2,113)	(176)
Net increase in cash, cash equivalents and restricted cash	23,984	4,447
Cash, cash equivalents and restricted cash at beginning of year	223,497	35,685
Cash, cash equivalents and restricted cash at end of period	247,481	40,132
Supplemental disclosure of cash flow:
Interest paid	15	225
Income taxes paid	1,831	2,327
Supplemental disclosure of non-cash investing and financing activities:
Finance leases	29	488
Property and equipment in accounts payable, other current liabilities and other liabilities	$ 382	$ 295

Debt - Additional Information (Detail)	1 Months Ended	3 Months Ended
Debt - Additional Information (Detail)	Jun. 30, 2019 USD ($) d $ / shares shares	Mar. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)
Convertible Senior Notes Due in 2024 [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount	$ 230,000,000.0
Debt instrument interest rate	0.25%
Additional principal amount of notes to underwriters	$ 30,000,000.0
Net proceeds from issuance of costs	$ 221,900,000
Debt instrument frequency of periodic payment		semi-annually
Interest payment commencement date	Dec. 01, 2019
Debt instrument maturity date	Jun. 01, 2024
Debt instrument, description		The Convertible Notes bear interest at a rate of 0.25% per year, payable semi-annually in arrears on June 1 and December 1 of each year, commencing December 1, 2019.
Debt instrument conversion rate principal amount of notes	$ 1,000
Debt instrument, convertible, terms of conversion feature		The Convertible Notes have an initial conversion rate of 21.5049 shares of the Company's Class A common stock per $1,000 principal amount of Convertible Notes, which is equivalent to an initial conversion price of approximately $46.50 per share of its Class A common stock.
Debt instrument, equity component	$ 51,800,000
Net carrying value of equity component of convertible notes		$ 50,000,000.0	$ 50,000,000.0
Convertible Senior Notes Due in 2024 [Member] \| Class A Common Stock [Member]
Debt Instrument [Line Items]
Debt conversion, converted instrument, shares issued \| shares	21.5049
Debt instrument conversion rate principal amount of notes	$ 1,000
Debt instrument convertible initial conversion price per share of common stock \| $ / shares	$ 46.50	$ 46.50
Convertible Senior Notes Due in 2024 [Member] \| Class A Common Stock [Member] \| Convertible Notes, Holders Conversion Rights, Circumstances 1 [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, consecutive trading days \| d	30
Convertible Senior Notes Due in 2024 [Member] \| Class A Common Stock [Member] \| Convertible Notes, Holders Conversion Rights, Circumstances 1 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, convertible, trading days \| d	20
Debt instrument, convertible, threshold percentage of conversion price	130.00%
Convertible Senior Notes Due in 2024 [Member] \| Class A Common Stock [Member] \| Convertible Notes, Holders Conversion Rights, Circumstances 2 [Member]
Debt Instrument [Line Items]
Debt instrument conversion rate principal amount of notes	$ 1,000
Debt instrument, convertible, consecutive trading days \| d	5
Debt instrument, convertible, business days \| d	5
Debt instrument, convertible, maximum threshold percentage of sale price of common stock during measurement period	98.00%
Twenty Nineteen Credit Agreement
Debt Instrument [Line Items]
Maturity date		Dec. 15, 2023
Credit facility		$ 150,000,000.0
Increase in line of credit borrowing capacity		50,000,000.0
Increase in unrestricted domestic cash		$ 20,000,000.0
Maximum leverage ratio		5.00%
Twenty Nineteen Credit Agreement \| Federal Funds Effective Swap Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		0.50%
Twenty Nineteen Credit Agreement \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.00%
Twenty Nineteen Credit Agreement \| 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%
Twenty Nineteen Credit Agreement \| Minimum [Member] \| Eurodollar Loans [Member]
Debt Instrument [Line Items]
Applicable margin for borrowings under new credit facility		1.25%
Twenty Nineteen Credit Agreement \| Minimum [Member] \| Swingline Loans [Member]
Debt Instrument [Line Items]
Applicable margin for borrowings under new credit facility		0.25%
Twenty Nineteen Credit Agreement \| Minimum [Member] \| APR Loans [Member]
Debt Instrument [Line Items]
Applicable margin for borrowings under new credit facility		0.25%
Twenty Nineteen Credit Agreement \| Maximum [Member]
Debt Instrument [Line Items]
Commitment fees on unused portion of the Revolving Credit Facility		0.30%
Senior secured leverage ratio		3.00%
Twenty Nineteen Credit Agreement \| Maximum [Member] \| Eurodollar Loans [Member]
Debt Instrument [Line Items]
Applicable margin for borrowings under new credit facility		2.00%
Twenty Nineteen Credit Agreement \| Maximum [Member] \| Swingline Loans [Member]
Debt Instrument [Line Items]
Applicable margin for borrowings under new credit facility		1.00%
Twenty Nineteen Credit Agreement \| Maximum [Member] \| APR Loans [Member]
Debt Instrument [Line Items]
Applicable margin for borrowings under new credit facility		1.00%
Secured Credit Agreement [Member]
Debt Instrument [Line Items]
Loan outstanding		$ 0
Amount available for future borrowing		$ 150,000,000.0

Debt

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Debt

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

	March 31,		December 31,
	2020		2019
Convertible senior notes	$	230,000	$	230,000
Obligations for finance leases		1,066		1,174
Total debt		231,066		231,174
Less: unamortized debt discount		44,462		46,820
Less: unamortized debt issuance costs		5,397		5,686
Less: current portion of long-term debt		430		430
Long-term debt, net of current portion	$	180,777	$	178,238

Convertible senior notes

In June 2019, the Company issued $230.0 million aggregate principal amount of 0.25% convertible senior notes due in 2024 (the "Convertible Notes"), which includes the underwriters’ exercise in full of their option to purchase an additional $30.0 million principal amount of the Convertible Notes, in a public offering. The net proceeds from the issuance of the Convertible Notes were $221.9 million after deducting the underwriting discounts and commissions and estimated issuance costs.

The Company entered into a First Supplemental Indenture relating to the issuance by the Company of the Convertible Notes (the “Supplemental Indenture”) supplementing the Indenture, dated June 10, 2019 (the “Base Indenture,” and together with the Supplemental Indenture, the “Indenture”), by and between the Company and U.S. Bank National Association, as trustee (the “Trustee”). The Indenture includes customary covenants and sets forth certain events of default after which the Convertible Notes may be declared immediately due and payable and sets forth certain types of bankruptcy or insolvency events of default involving the Company after which the Convertible Notes become automatically due and payable. The Convertible Notes are senior unsecured obligations of the Company.

The Convertible Notes bear interest at a rate of 0.25% per year, payable semi-annually in arrears on June 1 and December 1 of each year, commencing December 1, 2019. The Convertible Notes will mature on June 1, 2024, unless, earlier repurchased or redeemed by the Company or converted pursuant to their terms.

The Convertible Notes have an initial conversion rate of 21.5049 shares of the Company's Class A common stock per $1,000 principal amount of Convertible Notes, which is equivalent to an initial conversion price of approximately $46.50 per share of its Class A common stock. The conversion rate will be subject to adjustment upon the occurrence of certain events specified in the Indenture but will not be adjusted for any accrued and unpaid interest. In addition, upon the occurrence of a make whole fundamental change or a redemption period (each as defined in the Indenture), the Company will, in certain circumstances, increase the conversion rate by a specified number of additional shares for a holder who elects to convert its Convertible Notes in connection with such make whole fundamental change or during the relevant redemption period.

Holders of the Convertible Notes may convert all or any portion of their Convertible Notes at any time prior to the close of business on December 1, 2023, in integral multiples of $1,000 principal amount, only under the following circumstances:

•

During any calendar quarter commencing after the calendar quarter ending on September 30, 2019 (and only during such calendar quarter), if the last reported sale price of the Class A Common Stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day;

•

During the five business day period after any five consecutive trading day period (the “measurement period”) in which the trading price (as defined in the Indenture) per $1,000 principal amount of Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Class A Common Stock and the conversion rate on each such trading day;

•

If the Company calls any or all of the Convertible Notes for redemption (which the Company may not do prior to June 6, 2022), at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or

•

Upon the occurrence of specified corporate events.

On or after December 1, 2023 until the close of business on the business day immediately preceding the maturity date, holders may convert their Convertible Notes at any time, regardless of the foregoing circumstances. Upon conversion, the Company may satisfy its conversion obligation by paying and/or delivering, as the case may be, cash, shares of Class A Common Stock or a combination of cash and shares of the Class A Common Stock, at the Company’s election, in the manner and subject to the terms and conditions provided in the Indenture.

During the quarter ended March 31, 2020, the conditions allowing holders of the Convertible Notes to convert were not met. Therefore, the Convertible Notes were classified as long-term debt on the consolidated balance sheet as of March 31, 2020.

As of March 31, 2020, the “if converted value” did not exceed the principal amount of the Convertible Notes.

The Company accounts for the Convertible Notes as separate liability and equity components. The carrying amount of the liability component of the Convertible Notes was calculated by measuring the fair value of similar debt instruments that do not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the Convertible Notes. The difference between the principal amount of the Convertible Notes and the liability component, equal to $51.8 million (the “debt discount”), is amortized to interest expense over the term of the Convertible Notes using the effective interest method. The equity component is not remeasured as long as it continues to meet the conditions for equity classification.

The Company allocated issuance costs related to the issuance of the Convertible Notes to the liability and equity components using the same proportions as the initial carrying value of the Convertible Notes. Issuance costs attributable to the liability component are being amortized to interest expense using the effective interest method over the term of the Convertible Notes. Issuance costs attributable to the equity component are included with the equity component in stockholders’ equity.

The net carrying value of the liability component of the Convertible Notes was as follows (in thousands):

	March 31,		December 31,
	2020		2019
Principal	$	230,000	$	230,000
Less: unamortized debt discount		44,462		46,820
Less: unamortized debt issuance costs		5,397		5,686
Net carrying amount	$	180,141	$	177,494

The net carrying value of the equity component of the Convertible Notes was $50.0 million at both March 31, 2020 and December 31, 2019.

The interest expense recognized related to the Convertible Notes was as follows (in thousands):

	Three Months Ended March 31,
	2020
Contractual interest expense	$	144
Amortization of debt issuance cost and discount		2,647
Total	$	2,791

Credit agreement

Revolving credit facility

The Company has a $150.0 million credit facility with a maturity date of December 15, 2023 (“2019 Amended Credit Agreement”). The 2019 Amended Credit Agreement provides for an accordion feature that allows the Company to expand the size of the revolving line of credit by an additional $50.0 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 2019 Amended Credit Agreement).

As of March 31, 2020, the Company had no outstanding borrowings under the 2019 Amended Credit Agreement and there was $150.0 million available for future borrowing. The 2019 Amended Credit Agreement is available for general corporate purposes, including working capital, capital expenditures, and permitted acquisitions.

Borrowings under the 2019 Amended 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 2019 Amended Credit Agreement) in effect on such day, (2) the Federal Funds Effective Rate (as defined in the 2019 Amended Credit Agreement) in effect on such day plus 1/2 of 1.00% or (3) the Adjusted LIBO Rate (as defined in the 2019 Amended 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 2019 Amended 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 and swingline loans, 0.25% to 1.00%. The Company pays a commitment fee (based on the Company’s most recently tested consolidated total senior secured net leverage ratio) ranging from 0.15% to 0.30% on the unused portion of the 2019 Amended Credit Agreement.

Collateral and guarantees

The 2019 Amended 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 direct and indirect 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 direct and indirect domestic subsidiaries (subject in each case to certain exceptions as provided for under the 2019 Amended Credit Agreement). The Company’s direct and indirect domestic subsidiaries are guarantors of all the obligations under the 2019 Amended Credit Agreement.

Debt covenants

The 2019 Amended Credit Agreement requires the Company to maintain the following financial covenants:

•

Maximum Net Leverage Ratio: On the last day of each fiscal quarter, 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 2019 Amended Credit Agreement, for the rolling four quarter period ending on such date to be greater than 5.00 to 1.00 as of the last day of any such fiscal quarter.

•

Senior Secured Leverage Ratio: On the last day of each fiscal quarter, the Company on a consolidated basis will not permit the ratio of total indebtedness secured by a lien (net of unrestricted domestic cash in excess of $20.0 million) to EBITDA, as such terms are defined in the 2019 Amended 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 any such fiscal quarter.

•

Consolidated Interest Coverage Ratio: On the last day of each fiscal quarter, 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 2019 Amended 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 any such fiscal quarter.

At March 31, 2020, the Company was in compliance with all the above financial covenants.

Other Liabilities - Summary of Other Long-term Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Pension and other post retirement liabilities	$ 10,369	$ 10,379
Deferred tax liabilities	6,229	6,275
Other liabilities	2,874	10,018
Total	$ 19,472	$ 26,672

Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2020

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 sheet that sum to the total of the amounts reported in the consolidated statement of cash flows (in thousands):

	March 31, 2020		December 31, 2019
Cash and cash equivalents	$	247,145	$	223,117
Restricted cash included in other long-term assets		336		380
Total cash, cash equivalents, and restricted cash	$	247,481	$	223,497

Summary of Stock-Based Compensation

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

	Three Months Ended March 31,
	2020		2019
Cost of revenue – software	$	366	$	64
Research and development		1,428		358
Sales and marketing		727		462
General and administrative		650		328
Total stock-based compensation expense	$	3,171	$	1,212

Schedule of Other (Income) Expense, Net

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

	Three Months Ended March 31,
	2020			2019
Foreign exchange (gain) loss	$	(736	)	$	417
Other		(654	)		(27	)
Other (income) expense, net	$	(1,390	)	$	390

Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill Attributable to Software Reporting Segment (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning Balance	$ 233,683
Effects of foreign currency translation and other	(3,888)
Ending Balance	$ 229,795

Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

Basis of Presentation

Basis of presentation

The accompanying unaudited consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial information. Accordingly, the accompanying statements do not include all the information and notes required by GAAP for complete financial statements. The accompanying unaudited consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements (and notes thereto) for the year ended December 31, 2019, included in the most recent Annual Report on Form 10-K filed with the SEC. In the opinion of management, all adjustments considered necessary for a fair presentation of the financial statements have been included, and all adjustments are of a normal and recurring nature. The preparation of the 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. Considerable judgment is often involved in making these determinations; use of different assumptions could result in significantly different results. Management believes its assumptions and estimates are reasonable and appropriate. However, actual results may differ from those estimates. In addition, the results of operations for the three months ended March 31, 2020, are not necessarily indicative of the results that may be expected for any future period.

Use of Estimates

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 the stand alone selling price, or SSP, for each distinct performance obligation included in customer contracts with multiple performance obligations, the incremental borrowing rate used in the valuation of lease liabilities, the determination of the period of benefit for capitalized costs to obtain a contract, fair value of convertible senior notes, provision for credit loss, 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, and stock-based compensation. Actual results could differ from those estimates.

COVID-19

In March 2020, The World Health Organization declared the outbreak of COVID-19 a pandemic, and a public health emergency of international concern. The global spread of COVID-19 has created significant volatility and uncertainty in global financial markets. To limit the spread of COVID-19, governments have taken various actions including the issuance of travel restrictions, prohibitions of non-essential activities, shutdown of non-essential businesses, stay-at-home orders and social distancing guidelines. Accordingly, many businesses have adjusted to these actions by reducing or suspending operating activities. This has negatively impacted several of the markets the Company serves, including the automotive and aerospace markets.

As of the date of this report, the Company does not yet know the extent of the negative impact on its ability to attract, serve, retain or upsell customers. Furthermore, existing and potential customers may choose to reduce or delay technology spending in response to the COVID-19 outbreak, or attempt to renegotiate contracts and obtain concessions, which may materially and negatively impact the Company’s operating results, financial condition and new business. While the Company has not incurred significant disruptions thus far from the COVID-19 outbreak, the Company is unable to accurately predict the full impact that COVID-19 will have due to numerous uncertainties, including the full scope of the disease, the duration of the outbreak, actions that may be taken by governmental authorities, the impact to the businesses of the Company’s customers and partners and other factors. Even after the COVID-19 pandemic has subsided, the Company may experience material adverse impacts to

its business as a result of any economic recession or depression that has occurred or may occur in the future. The Company will continue to evaluate the nature and extent of the impact to its business, consolidated results of operations, and financial condition.

Cash, Cash Equivalents and Restricted Cash

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 sheet that sum to the total of the amounts reported in the consolidated statement of cash flows (in thousands):

	March 31, 2020		December 31, 2019
Cash and cash equivalents	$	247,145	$	223,117
Restricted cash included in other long-term assets		336		380
Total cash, cash equivalents, and restricted cash	$	247,481	$	223,497

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.

Inventory

Inventory consists of finished goods and 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 was $1.8 million and $2.4 million at March 31, 2020 and December 31, 2019, respectively, and is included in prepaid expenses and other current assets in the consolidated balance sheets.

Receivable for French R&D Credit

Receivable for French 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 activities. The tax credit is deductible from French income tax and any excess is carried forward three years. After three years, any unused credit may be reimbursed to the Company by the French government. As of March 31, 2020, the Company had approximately $12.7 million receivable from the French government related to CIR, of which $2.4 million was recorded in income tax receivable and the remaining $10.3 million was recorded in other long-term assets. As of December 31, 2019, the Company had approximately $12.1 million receivable from the French government related to CIR, of which $2.5 million was recorded in income tax receivable and the remaining $9.6 million was recorded in other long-term assets. CIR is subject to customary audit by French tax authorities.

Mezzanine Equity

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 at the issuance date and classified as mezzanine equity in the consolidated balance sheet. The put right option is terminated if the shareholders sell their shares. 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 instrument shall remain as mezzanine equity until one of the following three events take place: (1) the shares are sold on the 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 March 31, 2020, the classification remains as mezzanine equity.

Stock-based Compensation

Stock-based compensation expense

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

	Three Months Ended March 31,
	2020		2019
Cost of revenue – software	$	366	$	64
Research and development		1,428		358
Sales and marketing		727		462
General and administrative		650		328
Total stock-based compensation expense	$	3,171	$	1,212

Leases

The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use (“ROU”) assets, current portion of operating lease liabilities, and operating lease liabilities, net of current portion on the Company’s consolidated balance sheets. Finance leases are included in property and equipment, current portion of long-term debt, and long-term debt, net of current portion on the consolidated balance sheets.

Recent Accounting Guidance

Recent accounting guidance

Accounting standards adopted

Credit Losses – In June 2016, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU significantly changes how entities will measure credit losses on most financial assets. The Company adopted ASU 2016-13 effective January 1, 2020 and recorded a cumulative effect adjustment to retained earnings of $0.4 million related to the adoption of ASU 2016-13; prior periods have not been adjusted. Under this new accounting standard, beginning January 1, 2020, an allowance for expected credit losses for groups of billed and unbilled receivables and contract assets that share similar risk characteristics is recorded based on an evaluation of historical loss experience, current conditions, and reasonable and supportable forecasts. Accounts are written off when it becomes apparent that such amounts will not be collected, generally when amounts are past due by greater than one year. 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 $2.5 million and $1.4 million at March 31, 2020 and December 31, 2019, respectively.

Subsequent to adoption, the Company considered the impact of COVID-19 on its historical credit loss rates and made an adjustment to increase expected credit loss rates. The impact resulting from the increased credit loss rates did not have a material effect on the Company’s consolidated financial statements.

Fair Value – In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement. This ASU modifies the disclosure requirements for fair value measurements, by removing, modifying, or adding certain disclosures. The Company adopted ASU 2018-13 on January 1, 2020. The adoption of this guidance did not have a material effect on the Company’s consolidated financial statements.

Intangibles – In August 2018, the FASB issued ASU 2018-15, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract. This ASU clarifies and aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The Company adopted ASU 2018-15 on January 1, 2020, on a prospective basis. The adoption of this guidance did not have a material effect on the Company’s consolidated financial statements.

Accounting standards not yet adopted

Retirement Benefits – In August 2018, the FASB issued ASU 2018-14, Compensation – Retirement Benefits- Defined Benefit Plans – General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans. This ASU modifies the disclosure requirements for defined benefit pension or other postretirement plans. The amendments are effective for fiscal years ending after December 15, 2020; early adoption is permitted. The Company is currently evaluating the impact of the new guidance on its consolidated financial statements and related disclosures and does not expect this guidance to have a material effect on its consolidated financial statements.

Income Taxes – In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. This ASU simplifies the accounting for income taxes by removing certain exceptions to the general principles in Topic 740 and improves consistent application of GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The amendments are effective for fiscal years, and interim periods within those 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 and related disclosures and does not expect this guidance to have a material effect on its consolidated financial statements.

Reference Rate Reform – In March 2020, the FASB issued ASU 2020-04. Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting. This ASU provides optional expedients and exceptions for applying U.S. GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another rate that is expected to be discontinued. The amendments in the guidance are effective for all entities as of March 12, 2020 through December 31, 2022. The Company is currently evaluating the impact of this new guidance on its consolidated financial statements and related disclosures and does not expect this guidance to have a material effect on its consolidated financial statements.

Debt - Schedule of Net Carrying Value of Liability Component of Convertible Notes (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Principal	$ 231,066	$ 231,174
Less: unamortized debt discount	44,462	46,820
Less: unamortized debt issuance costs	5,397	5,686
Convertible Senior Notes Due in 2024 [Member]
Debt Instrument [Line Items]
Principal	230,000	230,000
Less: unamortized debt discount	44,462	46,820
Less: unamortized debt issuance costs	5,397	5,686
Net carrying amount	$ 180,141	$ 177,494

Net Income Per Share - Computation of Numerators and Denominators Used in Basic and Dilute Income Per Share Amounts (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income	$ 6,030	$ 13,019
Denominator:
Denominator for basic income per share— weighted average shares	72,623	70,786
Effect of dilutive securities, stock options and RSUs	4,381	5,934
Denominator for dilutive income per share	77,004	76,720
Net income per share attributable to common stockholders, basic	$ 0.08	$ 0.18
Net income per share attributable to common stockholders, diluted	$ 0.08	$ 0.17

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Income Per Share - Additional Information (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Earnings Per Share Basic [Line Items]
Anti-dilutive shares excluded from the computation of income per share	0	0
Class A Common Stock [Member] \| Convertible Senior Notes Due in 2024 [Member]
Earnings Per Share Basic [Line Items]
Debt instrument convertible initial conversion price per share of common stock	$ 46.50		$ 46.50

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 3,840	$ 3,528

Segment Information - Schedule of Segment Reporting Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 131,463	$ 127,859
Adjusted EBITDA	21,672	23,984
Software [Member]
Segment Reporting Information [Line Items]
Revenue	115,377	113,063
Adjusted EBITDA	20,464	24,042
CES [Member]
Segment Reporting Information [Line Items]
Revenue	13,878	12,050
Adjusted EBITDA	1,502	1,106
All Other [Member]
Segment Reporting Information [Line Items]
Revenue	2,208	2,746
Adjusted EBITDA	$ (294)	$ (1,164)

Net Income Per Share

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Net Income Per Share

10.	Net income per share

Basic 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 and restricted stock units (“RSUs”). Diluted 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 and RSUs under the treasury stock method. The following table sets forth the computation of the numerators and denominators used in the basic and diluted income per share amounts (in thousands, except per share data):

	Three Months Ended March 31,
	2020		2019
Numerator:
Net income	$	6,030	$	13,019
Denominator:
Denominator for basic income per share— weighted average shares		72,623		70,786
Effect of dilutive securities, stock options and RSUs		4,381		5,934
Denominator for dilutive income per share		77,004		76,720
Net income per share attributable to common stockholders, basic	$	0.08	$	0.18
Net income per share attributable to common stockholders, diluted	$	0.08	$	0.17

The computation of diluted 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 period or due to a net loss in the period. For each of the three months ended March 31, 2020 and 2019, there were no anti-dilutive shares excluded from the computation of income per share.

The Company expects to settle the principal amount of the Convertible Notes in cash, and therefore, the Company uses the treasury stock method for calculating any potential dilutive effect of the Conversion Option on diluted net income per share, if applicable. The Conversion Option will have a dilutive impact on net income per share of common stock when the average market price of the Company’s Class A common stock for a given period exceeds the conversion price of the Convertible Notes of $46.50 per share. During the three months ended March 31, 2020, the Company's weighted average common stock price was below the conversion price of the Convertible Notes.

Debt - Schedule of Carrying Value of Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt	$ 231,066	$ 231,174
Less: unamortized debt discount	44,462	46,820
Less: unamortized debt issuance costs	5,397	5,686
Current portion of long-term debt	430	430
Long-term debt, net of current portion	180,777	178,238
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Total debt	230,000	230,000
Obligations for Finance Leases [Member]
Debt Instrument [Line Items]
Total debt	$ 1,066	$ 1,174

Property and Equipment, Net

3 Months Ended

Mar. 31, 2020

Property Plant And Equipment [Abstract]

Property and Equipment, Net

5.	Property and equipment, net

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

	March 31,		December 31,
	2020		2019
Land	$	9,842	$	9,942
Building and improvements		15,502		15,512
Computer equipment and software		37,540		37,361
Office furniture and equipment		8,090		8,029
Leasehold improvements		8,855		9,014
Right-of-use assets under finance leases		2,724		2,745
Total property and equipment		82,553		82,603
Less: accumulated depreciation and amortization		47,104		46,306
Property and equipment, net	$	35,449	$	36,297

Depreciation expense, including amortization of right-of-use assets under finance leases, was $1.8 million and $1.7 million for the three months ended March 31, 2020 and 2019, respectively.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2020

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

13.	Commitments and contingencies

Swedish Tax Litigation

The Swedish Tax Authorities, or STA, have assessed tax (net of utilization of tax attributes), penalties and interest in the amount of $6.2 million related to the acquisition of Panopticon AB by Datawatch Corporation, in 2013 for the years 2013, 2014 and 2015. The STA, upon auditing the acquisition transaction, reached a conclusion that post acquisition, certain assets were removed from Sweden, triggering the tax obligation. The STA is also of the opinion that some services related to product development provided to the new parent company in the U.S. were performed by Panopticon AB at a price below market price triggering tax obligations. Datawatch contested the findings by the STA throughout the audit process including contesting the STA position in the first level of administrative courts. An Administrative Court hearing was held on May 16, 2019. On May 29, 2019, the Administrative Court issued its ruling in favor of Datawatch AB. On July 4, 2019, the STA filed an appeal of the Administrative Court ruling with the Administrative Court of Appeal in Stockholm, effectively continuing to assert that the assessments are in fact appropriate. In September 2019, the Company submitted its filing in response to the STA appeal with the Court of Appeals. On October 10, 2019, the STA filed an answer to the Company’s defrayment, and on January 31, 2020, the Company filed a second submission to the Court. The Court of Appeals held a hearing regarding this matter on February 20, 2020. On March 27, 2020, the Court of Appeals issued its finding in favor of the STA. Pursuant to requirements in Sweden, the Company paid the assessed tax, penalties and interest on April 24, 2020. The Company retains the right to appeal the ruling to the Administrative Supreme Court of Sweden for a period of 60 days from the date of the finding. The Company is presently assessing whether to pursue this appeal.

Other 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.

Goodwill and Other Intangible Assets

3 Months Ended

Mar. 31, 2020

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, were as follows (in thousands):

Balance at December 31, 2019	$	233,683
Effects of foreign currency translation and other		(3,888	)
Balance at March 31, 2020	$	229,795

Other intangible assets

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

	March 31, 2020
	Weighted average amortization period	Gross carrying amount		Accumulated amortization		Net carrying amount
Definite-lived intangible assets:
Developed technology	4-6 years	$	58,738	$	27,248	$	31,490
Customer relationships	7-10 years		31,830		12,378		19,452
Other intangibles	10 years		173		51		122
Total definite-lived intangible assets			90,741		39,677		51,064
Indefinite-lived intangible assets:
Trade names			10,294				10,294
Total other intangible assets		$	101,035	$	39,677	$	61,358

	December 31, 2019
	Weighted average amortization period	Gross carrying amount		Accumulated amortization		Net carrying amount
Definite-lived intangible assets:
Developed technology	4-6 years	$	60,916	$	25,838	$	35,078
Customer relationships	7-10 years		32,582		11,575		21,007
Other intangibles	10 years		111		62		49
Total definite-lived intangible assets			93,609		37,475		56,134
Indefinite-lived intangible assets:
Trade names			10,941				10,941
Total other intangible assets		$	104,550	$	37,475	$	67,075

Amortization expense related to intangible assets was $3.8 million and $3.5 million for the three months ended March 31, 2020 and 2019, respectively.

The Company continues to monitor the significant global economic uncertainty as a result of COVID-19 to assess the outlook for demand for its products and the impact on its business. Based on the Company’s interim impairment assessment, there were no indicators of impairment identified during the first quarter of 2020. However, a lack of recovery or further deterioration in market conditions, among other factors, as a result of the COVID-19 pandemic could result in an impairment charge in future periods which could have a material adverse effect on the Company’s financial statements.

The allocation of fair value of purchase consideration of the Company’s 2019 acquisitions was finalized in the first quarter of 2020, and there were no material changes to the fair value of assets acquired and liabilities assumed, as previously reported.

Fair Value Measurements - Additional Information (Detail) $ in Millions	Mar. 31, 2020 USD ($)
Fair Value Disclosures [Abstract]
Fair value of convertible notes	$ 202.7

Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 131,463	$ 127,859
Term Licenses [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	69,381	65,057
Perpetual Licenses [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	8,162	11,564
Maintenance [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	28,208	22,752
Professional Services and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	2,692	3,918
Software [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 108,443	$ 103,291

Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 247,145	$ 223,117
Restricted cash included in other long-term assets	336	380
Total cash, cash equivalents, and restricted cash	$ 247,481	$ 223,497	$ 40,132	$ 35,685

Revenue from Contracts with Customers - Additional Information (Detail)1	Mar. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-04-01
Revenue From Contracts With Customers [Line Items]
Revenue, remaining contractual obligation, expected to recognize, period	12 months

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2020	Apr. 20, 2020
Document And Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Trading Symbol	ALTR
Entity Registrant Name	ALTAIR ENGINEERING INC.
Entity Central Index Key	0001701732
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity File Number	001-38263
Entity Tax Identification Number	38-2591828
Entity Address, Address Line One	1820 East Big Beaver Road
Entity Address, City or Town	Troy
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48083
City Area Code	248
Local Phone Number	614-2400
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	Class A Common Stock $0.0001 par value per share
Security Exchange Name	NASDAQ
Class A Common Stock [Member]
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		41,816,035
Class B Common Stock [Member]
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		31,050,732

Income Taxes (Tables)

3 Months Ended

Mar. 31, 2020

Income Tax Disclosure [Abstract]

Schedule of Income Tax Expense and Effective Tax Rate

The Company’s income tax expense and effective tax rate for the three months ended March 31, 2020 and 2019, were as follows (in thousands, except percentages):

	Three Months Ended March 31,
	2020			2019
Income tax expense	$	4,652		$	4,088
Effective tax rate		44	%		24	%

Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2020

Equity [Abstract]

Accumulated Other Comprehensive Loss

12.	Accumulated other comprehensive loss

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

	Foreign currency translation			Retirement related benefit plans			Total
Balance at January 1, 2020	$	(6,928	)	$	(2,600	)	$	(9,528	)
Other comprehensive (loss) income before reclassification		(7,578	)		106			(7,472	)
Amounts reclassified from accumulated other comprehensive loss	—				44			44
Tax effects		—			(13	)		(13	)
Other comprehensive (loss) income		(7,578	)		137			(7,441	)
Balance at March 31, 2020	$	(14,506	)	$	(2,463	)	$	(16,969	)

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2020	Dec. 31, 2019
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	45,000,000	45,000,000
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	513,797,000
Common stock, shares issued	41,779,000	41,271,000
Common stock, shares outstanding	41,779,000	41,271,000
Class B Common Stock [Member]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	41,203,000	41,203,000
Common stock, shares issued	31,051,000	31,131,000
Common stock, shares outstanding	31,051,000	31,131,000

Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member] Class A Common Stock [Member]	Common Stock [Member] Class B Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance at Dec. 31, 2018	$ 293,686	$ 4	$ 3	$ 379,832	$ (74,863)	$ (11,290)
Beginning balance (in shares) at Dec. 31, 2018		38,349	32,171
Net income	13,019				13,019
Exercise of stock options	458			458
Exercise of stock options (in shares)		397
Vesting of restricted stock (in shares)		14
Stock-based compensation	869			869
Foreign currency translation, net of tax	337					337
Retirement related benefit plans, net of tax	228					228
Ending balance at Mar. 31, 2019	308,597	$ 4	$ 3	381,159	(61,844)	(10,725)
Ending balance (in shares) at Mar. 31, 2019		38,760	32,171
Beginning balance at Dec. 31, 2019	354,707	$ 4	$ 3	446,633	(82,405)	(9,528)
Beginning balance (in shares) at Dec. 31, 2019		41,271	31,131
Cumulative effect of an accounting change at Dec. 31, 2019	(388)				(388)
Net income	6,030				6,030
Exercise of stock options	194			194
Exercise of stock options (in shares)		285
Vesting of restricted stock (in shares)		143
Conversion from Class B to Class A common stock		80	(80)
Stock-based compensation	3,043			3,043
Foreign currency translation, net of tax	(7,578)					(7,578)
Retirement related benefit plans, net of tax	137					137
Ending balance at Mar. 31, 2020	$ 356,145	$ 4	$ 3	$ 449,870	$ (76,763)	$ (16,969)
Ending balance (in shares) at Mar. 31, 2020		41,779	31,051

Recent Accounting Guidance - Additional Information (Detail) - USD ($) $ in Millions	Jan. 01, 2020	Mar. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for doubtful accounts		$ 2.5	$ 1.4
ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings	$ 0.4

Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2020

Revenue From Contract With Customer [Abstract]

Schedule of Disaggregation of Revenue

The Company disaggregates its software revenue by type of performance obligation and timing of revenue recognition as follows (in thousands):

	Three Months Ended March 31,
	2020		2019
Software revenue:
Term licenses	$	69,381	$	65,057
Perpetual licenses		8,162		11,564
Maintenance		28,208		22,752
Professional services and other		2,692		3,918
Total software revenue	$	108,443	$	103,291

Segment Information (Tables)

3 Months Ended

Mar. 31, 2020

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

The following tables are in thousands:


Three months ended March 31, 2020	Software		CES		All other			Total
Revenue	$	115,377	$	13,878	$	2,208		$	131,463
Adjusted EBITDA	$	20,464	$	1,502	$	(294	)	$	21,672


Three months ended March 31, 2019	Software		CES		All other			Total
Revenue	$	113,063	$	12,050	$	2,746		$	127,859
Adjusted EBITDA	$	24,042	$	1,106	$	(1,164	)	$	23,984

Reconciliation of U.S. GAAP Income Before Income Taxes to Adjusted EBITDA

	Three Months Ended March 31,
	2020			2019
Reconciliation of Adjusted EBITDA to U.S. GAAP income before income taxes:
Adjusted EBITDA	$	21,672		$	23,984
Stock-based compensation expense		(3,171	)		(1,212	)
Interest expense		(2,813	)		(270	)
Interest income and other ⁽¹⁾		654			(201	)
Depreciation and amortization		(5,660	)		(5,194	)
Income before income taxes	$	10,682		$	17,107

⁽¹⁾	^{Includes a $0.2 million impairment charge for royalty contracts for the three months ended March 31, 2019.}

Fair Value Measurements

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Fair Value Measurements

9.	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.

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 line of credit is at a variable rate, and as such the debt obligation outstanding approximates fair value.

The carrying value of the Company’s Convertible Notes are at face value less unamortized debt discount and issuance costs. The estimated fair values of the Convertible Notes, which the Company has classified as Level 2 financial instruments, were determined based on quoted bid prices of the Convertible Notes on the last trading day of each reporting period. At March 31, 2020, the fair value of the Convertible Notes was $202.7 million and is presented for required disclosure purposes only. For further information on the Convertible Notes, see Note 7. – Debt.

- 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

Property and Equipment, Net (Tables)

3 Months Ended

Mar. 31, 2020

Property Plant And Equipment [Abstract]

Summary of Property and Equipment

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

	March 31,		December 31,
	2020		2019
Land	$	9,842	$	9,942
Building and improvements		15,502		15,512
Computer equipment and software		37,540		37,361
Office furniture and equipment		8,090		8,029
Leasehold improvements		8,855		9,014
Right-of-use assets under finance leases		2,724		2,745
Total property and equipment		82,553		82,603
Less: accumulated depreciation and amortization		47,104		46,306
Property and equipment, net	$	35,449	$	36,297

Other Liabilities

3 Months Ended

Mar. 31, 2020

Other Liabilities Disclosure [Abstract]

Other Liabilities

8.	Other liabilities

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

	March 31,		December 31,
	2020		2019
Income taxes payable	$	12,563	$	6,008
Accrued VAT		5,101		5,312
Accrued royalties		3,811		2,314
Accrued professional fees		2,864		2,581
Obligations for acquisition of businesses		1,362		1,362
Defined contribution plan liabilities		1,103		1,593
Billings in excess of cost		744		879
Non-income tax liabilities		639		1,253
Other current liabilities		7,573		7,301
Total	$	35,760	$	28,603

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

	March 31,		December 31,
	2020		2019
Pension and other post retirement liabilities	$	10,369	$	10,379
Deferred tax liabilities		6,229		6,275
Other liabilities		2,874		10,018
Total	$	19,472	$	26,672

Segment Information

3 Months Ended

Mar. 31, 2020

Segment Reporting [Abstract]

Segment Information

14.	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, or “CES”. The primary measure of segment operating performance is Adjusted EBITDA, which is defined as net income (loss) 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. To a much lesser extent, the Software segment also includes revenue from the sale of hardware products, primarily as a result of prior business acquisitions.

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, and for control of LED lighting. Other businesses combined within Other include the Company’s WEYV business, which ceased operations in the third quarter of 2019, and potential services and product concepts that are still in their development stages.

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 – Accounting policies.

The following tables are in thousands:


Three months ended March 31, 2020	Software		CES		All other			Total
Revenue	$	115,377	$	13,878	$	2,208		$	131,463
Adjusted EBITDA	$	20,464	$	1,502	$	(294	)	$	21,672


Three months ended March 31, 2019	Software		CES		All other			Total
Revenue	$	113,063	$	12,050	$	2,746		$	127,859
Adjusted EBITDA	$	24,042	$	1,106	$	(1,164	)	$	23,984

	Three Months Ended March 31,
	2020			2019
Reconciliation of Adjusted EBITDA to U.S. GAAP income before income taxes:
Adjusted EBITDA	$	21,672		$	23,984
Stock-based compensation expense		(3,171	)		(1,212	)
Interest expense		(2,813	)		(270	)
Interest income and other ⁽¹⁾		654			(201	)
Depreciation and amortization		(5,660	)		(5,194	)
Income before income taxes	$	10,682		$	17,107

⁽¹⁾	^{Includes a $0.2 million impairment charge for royalty contracts for the three months ended March 31, 2019.}

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Total revenue	$ 131,463	$ 127,859
Total cost of revenue	34,497	32,885
Gross profit	96,966	94,974
Operating expenses:
Research and development	31,467	27,516
Sales and marketing	28,099	26,451
General and administrative	22,346	20,329
Amortization of intangible assets	3,840	3,528
Other operating income, net	(891)	(617)
Total operating expenses	84,861	77,207
Operating income	12,105	17,767
Interest expense	2,813	270
Other (income) expense, net	(1,390)	390
Income before income taxes	10,682	17,107
Income tax expense	4,652	4,088
Net income	$ 6,030	$ 13,019
Income per share:
Net income per share attributable to common stockholders, basic	$ 0.08	$ 0.18
Net income per share attributable to common stockholders, diluted	$ 0.08	$ 0.17
Weighted average shares outstanding:
Weighted average number of shares used in computing net income per share, basic	72,623	70,786
Weighted average number of shares used in computing net income per share, diluted	77,004	76,720
License [Member]
Total revenue	$ 77,543	$ 76,621
Total cost of revenue	5,523	5,821
Maintenance and Other Services [Member]
Total revenue	30,900	26,670
Total cost of revenue	10,455	8,531
Total Software [Member]
Total revenue	108,443	103,291
Total cost of revenue	15,978	14,352
Software Related Services [Member]
Total revenue	6,934	9,772
Total cost of revenue	5,489	6,518
Total Software and Related Services [Member]
Total revenue	115,377	113,063
Total cost of revenue	21,467	20,870
Client Engineering Services [Member]
Total revenue	13,878	12,050
Total cost of revenue	11,318	9,800
Other [Member]
Total revenue	2,208	2,746
Total cost of revenue	$ 1,712	$ 2,215

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended
	Mar. 27, 2020	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Effective tax rate for net discrete expense (benefit)		$ 2.0	$ (1.1)
Net operating loss offset of taxable income, percentage	100.00%
Percentage of interest expense deduction of adjusted taxable income	50.00%

Income Taxes

3 Months Ended

Mar. 31, 2020

Income Tax Disclosure [Abstract]

Income Taxes

11.	Income taxes

At the end of each interim period, the Company makes its best estimate of the annual expected effective income tax rate and applies that rate to its ordinary year-to-date income (loss) before income taxes. The income tax provision or benefit related to unusual or infrequent items, if applicable, that will be separately reported or reported net of their related tax effects are individually computed and recognized in the interim period in which those items occur. In addition, the effect of changes in enacted tax laws or rates, tax status, judgment on the realizability of a beginning-of-the-year deferred tax asset in future years or income tax contingencies is recognized in the interim period in which the change occurs.

The computation of the annual expected effective income tax rate at each interim period requires certain estimates and assumptions including, but not limited to, the expected income (loss) before income taxes for the year, projections of the proportion of income (and/or loss) earned and taxed in respective tax jurisdictions, including applicable foreign taxes withheld at the source, permanent and temporary differences, and the likelihood of the realizability of deferred tax assets generated in the current year. Jurisdictions with a projected loss for the year or a year-to-date loss for which no tax benefit can be recognized due to a valuation allowance are excluded from the estimated annual effective tax rate. The impact of such an exclusion could result in a higher or lower effective tax rate during a particular quarter, based upon the composition and timing of actual earnings compared to annual projections. The estimates used to compute the provision or benefit for income taxes may change as new events occur, additional information is obtained or the Company’s tax environment changes. To the extent that the expected annual effective income tax rate changes, the effect of the change on prior interim periods is included in the income tax provision in the period in which the change in estimate occurs.

The Company’s income tax expense and effective tax rate for the three months ended March 31, 2020 and 2019, were as follows (in thousands, except percentages):

	Three Months Ended March 31,
	2020			2019
Income tax expense	$	4,652		$	4,088
Effective tax rate		44	%		24	%

The tax rate is affected by the Company being a U.S. resident taxpayer, the tax rates in the U.S. and other jurisdictions in which the Company operates, the relative amount of income earned by jurisdiction and the relative amount of losses or income for which no benefit or expense is recognized due to a valuation allowance. The Company’s effective tax rate for the three months ended March 31, 2020 and 2019, also includes net discrete expense of $2.0 million and net discrete benefit of $1.1 million, respectively, primarily related to changes in reserves, changes in accruals for unremitted earnings and other adjustments.

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was enacted in response to the COVID-19 pandemic. The CARES Act, among other things, permits NOL carryovers and carrybacks to offset 100% of taxable income for taxable years beginning before 2021. In addition, the CARES Act allows NOLs incurred in 2018, 2019, and 2020 to be carried back to each of the five preceding taxable years to generate a refund of previously paid income taxes. The CARES Act also provides a temporary relaxation of the section 163(j) limitation on business interest expense deductions to 50% of adjusted taxable income for tax years beginning in 2019 and 2020, and an election to use 2019 adjusted taxable income for tax years beginning in 2020. The Company is currently evaluating the impact of the CARES Act, but at present does not expect that the NOL carryback provision of the CARES Act would result in a material tax benefit. The Company also does not expect the relaxation of section 163(j) provisions to have a material tax benefit since the Company is expected to be in a net interest income position.

Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2013 USD ($)
Datawatch Corporation [Member] \| Panopticon AB [Member] \| Swedish Tax Authorities [Member]
Loss Contingencies [Line Items]
Tax assessment, penalties and interest amount related to acquisition	$ 6.2

Debt (Tables)

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Schedule of Carrying Value of Debt

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

	March 31,		December 31,
	2020		2019
Convertible senior notes	$	230,000	$	230,000
Obligations for finance leases		1,066		1,174
Total debt		231,066		231,174
Less: unamortized debt discount		44,462		46,820
Less: unamortized debt issuance costs		5,397		5,686
Less: current portion of long-term debt		430		430
Long-term debt, net of current portion	$	180,777	$	178,238

Schedule of Net Carrying Value of Liability Component of Convertible Notes

The net carrying value of the liability component of the Convertible Notes was as follows (in thousands):

	March 31,		December 31,
	2020		2019
Principal	$	230,000	$	230,000
Less: unamortized debt discount		44,462		46,820
Less: unamortized debt issuance costs		5,397		5,686
Net carrying amount	$	180,141	$	177,494

Schedule of Interest Expense Recognized Related to Convertible Notes

The interest expense recognized related to the Convertible Notes was as follows (in thousands):

	Three Months Ended March 31,
	2020
Contractual interest expense	$	144
Amortization of debt issuance cost and discount		2,647
Total	$	2,791

Organization and Description of Business

3 Months Ended

Mar. 31, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Organization and Description of Business

1.	Organization and description of business

Altair Engineering Inc. (“Altair” or the “Company”) is incorporated in the state of Delaware. The Company is a global technology company providing software and cloud solutions in the areas of product development, high performance computing and data analytics. Altair enables organizations across broad industry segments to compete more effectively in a connected world while creating a more sustainable future. The Company is headquartered in Troy, Michigan.

Recent Accounting Guidance

3 Months Ended

Mar. 31, 2020

Accounting Changes And Error Corrections [Abstract]

Recent Accounting Guidance

3.	Recent accounting guidance

Accounting standards adopted

Accounting standards not yet adopted

Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) income before reclassification	$ (7,472)
Amounts reclassified from accumulated other comprehensive loss	44
Tax effects	(13)
Total other comprehensive (loss) income	(7,441)	$ 565
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6,928)
Other comprehensive (loss) income before reclassification	(7,578)
Total other comprehensive (loss) income	(7,578)
Ending balance	(14,506)
Retirement Related Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(2,600)
Other comprehensive (loss) income before reclassification	106
Amounts reclassified from accumulated other comprehensive loss	44
Tax effects	(13)
Total other comprehensive (loss) income	137
Ending balance	(2,463)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(9,528)
Ending balance	$ (16,969)

Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Summary Of Other Intangible Assets [Line Items]
Gross carrying amount	$ 90,741	$ 93,609
Accumulated amortization	39,677	37,475
Net carrying amount	51,064	56,134
Gross carrying amount	101,035	104,550
Accumulated amortization	39,677	37,475
Net carrying amount	61,358	67,075
Developed Technology [Member]
Summary Of Other Intangible Assets [Line Items]
Gross carrying amount	58,738	60,916
Accumulated amortization	27,248	25,838
Net carrying amount	$ 31,490	$ 35,078
Developed Technology [Member] \| Minimum [Member]
Summary Of Other Intangible Assets [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets	4 years	4 years
Developed Technology [Member] \| Maximum [Member]
Summary Of Other Intangible Assets [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets	6 years	6 years
Customer Relationships [Member]
Summary Of Other Intangible Assets [Line Items]
Gross carrying amount	$ 31,830	$ 32,582
Accumulated amortization	12,378	11,575
Net carrying amount	$ 19,452	$ 21,007
Customer Relationships [Member] \| Minimum [Member]
Summary Of Other Intangible Assets [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets	7 years	7 years
Customer Relationships [Member] \| Maximum [Member]
Summary Of Other Intangible Assets [Line Items]
Weighted-average useful life of acquired finite-lived intangible assets	10 years	10 years
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	$ 173	$ 111
Accumulated amortization	51	62
Net carrying amount	122	49
Trade Names [Member]
Summary Of Other Intangible Assets [Line Items]
Net carrying amount	$ 10,294	$ 10,941

Other Liabilities (Tables)

3 Months Ended

Mar. 31, 2020

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):

	March 31,		December 31,
	2020		2019
Income taxes payable	$	12,563	$	6,008
Accrued VAT		5,101		5,312
Accrued royalties		3,811		2,314
Accrued professional fees		2,864		2,581
Obligations for acquisition of businesses		1,362		1,362
Defined contribution plan liabilities		1,103		1,593
Billings in excess of cost		744		879
Non-income tax liabilities		639		1,253
Other current liabilities		7,573		7,301
Total	$	35,760	$	28,603

Summary of Other Long-term Liabilities

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

	March 31,		December 31,
	2020		2019
Pension and other post retirement liabilities	$	10,369	$	10,379
Deferred tax liabilities		6,229		6,275
Other liabilities		2,874		10,018
Total	$	19,472	$	26,672

Income Taxes - Schedule of Income Tax Expense and Effective Tax Rate (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income tax expense	$ 4,652	$ 4,088
Effective tax rate	44.00%	24.00%

Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2020

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, were as follows (in thousands):

Balance at December 31, 2019	$	233,683
Effects of foreign currency translation and other		(3,888	)
Balance at March 31, 2020	$	229,795

Schedule of Other Intangible Assets

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

	March 31, 2020
	Weighted average amortization period	Gross carrying amount		Accumulated amortization		Net carrying amount
Definite-lived intangible assets:
Developed technology	4-6 years	$	58,738	$	27,248	$	31,490
Customer relationships	7-10 years		31,830		12,378		19,452
Other intangibles	10 years		173		51		122
Total definite-lived intangible assets			90,741		39,677		51,064
Indefinite-lived intangible assets:
Trade names			10,294				10,294
Total other intangible assets		$	101,035	$	39,677	$	61,358

	December 31, 2019
	Weighted average amortization period	Gross carrying amount		Accumulated amortization		Net carrying amount
Definite-lived intangible assets:
Developed technology	4-6 years	$	60,916	$	25,838	$	35,078
Customer relationships	7-10 years		32,582		11,575		21,007
Other intangibles	10 years		111		62		49
Total definite-lived intangible assets			93,609		37,475		56,134
Indefinite-lived intangible assets:
Trade names			10,941				10,941
Total other intangible assets		$	104,550	$	37,475	$	67,075

Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Foreign currency translation, tax effect	$ 0	$ 0
Retirement related benefit plans, tax effect	$ 13	$ 0

Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue From Contracts With Customers [Line Items]
Percentage of net revenues through indirect channels	10.00%	10.00%
Capitalized contract cost, amortization period	4 years
Capitalized contract cost, amortization method	straight-line basis
Deferred revenue, revenue recognized	$ 36.1
Contracted revenue not yet recognized	$ 120.2
Revenue recognize percentage	77.00%
Sales and Marketing Expense [Member]
Revenue From Contracts With Customers [Line Items]
Capitalized contract cost, amortization expense	$ 0.7	$ 1.0
Prepaid and Other Current Assets [Member]
Revenue From Contracts With Customers [Line Items]
Capitalized contract cost net, current	2.6		$ 2.3
Contract assets	2.6		2.7
Other Long-Term Assets [Member]
Revenue From Contracts With Customers [Line Items]
Capitalized contract cost net, noncurrent	0.8		0.8
Accounts Receivable [Member]
Revenue From Contracts With Customers [Line Items]
Contract assets	$ 5.5		$ 4.5

Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2020

Equity [Abstract]

Components of Accumulated Other Comprehensive Loss

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

	Foreign currency translation			Retirement related benefit plans			Total
Balance at January 1, 2020	$	(6,928	)	$	(2,600	)	$	(9,528	)
Other comprehensive (loss) income before reclassification		(7,578	)		106			(7,472	)
Amounts reclassified from accumulated other comprehensive loss	—				44			44
Tax effects		—			(13	)		(13	)
Other comprehensive (loss) income		(7,578	)		137			(7,441	)
Balance at March 31, 2020	$	(14,506	)	$	(2,463	)	$	(16,969	)

Property and Equipment, Net - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 82,553	$ 82,603
Less: accumulated depreciation and amortization	47,104	46,306
Property and equipment, net	35,449	36,297
Land [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	9,842	9,942
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	15,502	15,512
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	37,540	37,361
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	8,090	8,029
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	8,855	9,014
Right-of-Use Assets Under Finance Leases [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 2,724	$ 2,745

Segment Information - Reconciliation of U.S. GAAP Income Before Income Taxes to Adjusted EBITDA (Parenthetical) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Segment Reporting [Abstract]
Impairment charge recognized in non-recurring adjustment for royalty contracts	$ 0.2

Accounting Policies - Summary of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 3,171	$ 1,212
Cost of Revenue - Software [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	366	64
Research and development [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,428	358
Sales and marketing [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	727	462
General and administrative [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 650	$ 328

Debt - Schedule of Interest Expense Recognized Related to Convertible Notes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Amortization of debt issuance cost and discount	$ 2,653	$ 4
Convertible Senior Notes Due in 2024 [Member]
Debt Instrument [Line Items]
Contractual interest expense	144
Amortization of debt issuance cost and discount	2,647
Total	$ 2,791

Segment Information - Additional Information (Detail)	3 Months Ended
Segment Information - Additional Information (Detail)	Mar. 31, 2020 Segment
Segment Reporting [Abstract]
Number of reportable segments	2

Accounting Policies

3 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

Accounting Policies

2.	Accounting policies

Basis of presentation

Use of estimates

COVID-19

Cash, cash equivalents and restricted cash

	March 31, 2020		December 31, 2019
Cash and cash equivalents	$	247,145	$	223,117
Restricted cash included in other long-term assets		336		380
Total cash, cash equivalents, and restricted cash	$	247,481	$	223,497

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.

Inventory

Receivable for French R&D credit

Mezzanine equity

Stock-based compensation expense

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

	Three Months Ended March 31,
	2020		2019
Cost of revenue – software	$	366	$	64
Research and development		1,428		358
Sales and marketing		727		462
General and administrative		650		328
Total stock-based compensation expense	$	3,171	$	1,212

Leases

Other (income) expense, net

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

	Three Months Ended March 31,
	2020			2019
Foreign exchange (gain) loss	$	(736	)	$	417
Other		(654	)		(27	)
Other (income) expense, net	$	(1,390	)	$	390

Accounting Policies - Schedule of Other (Income) Expense, Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accounting Policies [Abstract]
Foreign exchange (gain) loss	$ (736)	$ 417
Other	(654)	(27)
Other (income) expense, net	$ (1,390)	$ 390

Segment Information - Reconciliation of U.S. GAAP Income Before Income Taxes to Adjusted EBITDA (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting [Abstract]
Adjusted EBITDA	$ 21,672	$ 23,984
Stock-based compensation expense	(3,171)	(1,212)
Interest expense	(2,813)	(270)
Interest income and other	654	(201)
Depreciation and amortization	(5,660)	(5,194)
Income before income taxes	$ 10,682	$ 17,107

Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Computation of Numerators and Denominators Used in Basic and Dilute Income Per Share Amounts

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

	Three Months Ended March 31,
	2020		2019
Numerator:
Net income	$	6,030	$	13,019
Denominator:
Denominator for basic income per share— weighted average shares		72,623		70,786
Effect of dilutive securities, stock options and RSUs		4,381		5,934
Denominator for dilutive income per share		77,004		76,720
Net income per share attributable to common stockholders, basic	$	0.08	$	0.18
Net income per share attributable to common stockholders, diluted	$	0.08	$	0.17

Revenue from Contracts with Customers

3 Months Ended

Mar. 31, 2020

Revenue From Contract With Customer [Abstract]

Revenue from Contracts with Customers

4.	Revenue from contracts with customers

Revenue recognition

Software revenue

Revenue is derived principally from the licensing of software products and from related maintenance contracts. The Company enters into contracts that include combinations of products, maintenance and services, which are accounted for as separate performance obligations with differing revenue recognition patterns.

Revenue from term-based software licenses is classified as software revenue. Term-based licenses are sold only as a bundled arrangement that includes the rights to a term-based software license and post-contract customer support (PCS), which includes unspecified technical enhancements and customer support. Maximizing the use of observable inputs, the Company determined that a majority of the estimated standalone selling prices of the term-based license is attributable to the term-based license and a minority is attributable to the PCS. The license component is classified as license revenue and recognized as revenue upon the later of delivery of the licensed product or the beginning of the license period. PCS is classified as maintenance and other services and is recognized ratably over the term of the contract, as the Company provides the PCS benefit over time as a stand ready to perform obligation.

In addition to term-based software licenses, the Company sells perpetual licenses. Software revenue is recognized upon the later of delivery of the licensed product or the beginning of the license period. Typically, the Company’s perpetual licenses are sold with PCS. The Company allocates value in bundled perpetual and PCS arrangements based on the value relationship between the software license and maintenance. Revenue from PCS is classified as maintenance and other services and is recognized ratably over the term of the contract, as the Company satisfies the PCS performance obligation over time as a stand ready to perform obligation.

Revenue from training, consulting and other services is recognized as the services are performed, and is classified as maintenance and other services in the consolidated statement of operations. For contracts in which the service consists of a single performance obligation, such as providing a training class to a customer, the Company recognizes revenue upon completion of the performance obligation. For service contracts that are longer in duration and often include multiple performance obligations (for example, point-in-time training and consulting), the Company measures the progress toward completion of the obligations and recognizes revenue accordingly. In measuring progress towards the completion of performance obligations, the Company typically utilizes output-based estimates for services with fixed fee arrangements, and estimates output based on the total tasks completed as compared to the total tasks required for each contract. Input-based estimates are utilized for services that involve general consultations with contractual billing arrangements based on time and materials, utilizing direct labor as the input measure.

The Company also executes arrangements through indirect channel partners in which the channel partners are authorized to market and distribute the Company's software products to end users of the Company's products and services in specified territories. In sales facilitated by channel partners, the channel partner bears the risk of collection from the end-user customer. The Company recognizes revenue from transactions with channel partners when the channel partner submits a purchase commitment, collectability from the channel partner is probable, and the performance obligation is met, at a point in time or over time as appropriate, provided that all other revenue recognition criteria are satisfied. Revenue from channel partner transactions is the amount remitted to the Company by the channel partners. This amount includes a fee for PCS that is compensation for providing technical enhancements and the second level of technical support to the end user, which is recognized over the period that PCS is to be provided. The Company does not offer right of return, product rotation, or price protection to any of its channel partners.

Non-income related taxes collected from customers and remitted to governmental authorities are recorded on the consolidated balance sheet as accounts receivable, net and other accrued expenses and current liabilities. These amounts are reported on a net basis in the consolidated statements of operations and do not impact reported revenues or expenses. Certain hardware revenue is included within software revenue and is recognized when all revenue recognition criteria stated above are met, which is generally when the products are delivered to end customers.

Significant judgments

Software revenue

The Company’s contracts with customers typically include promises to transfer licenses and services to a customer. Judgment is required to determine if the promises are separate performance obligations within the context of the arrangement, and if so, the allocation of the transaction price to each performance obligation. The Company’s determination of standalone selling price for performance obligations is based on the midpoint of the range of historical observable prices for goods and services sold separately. In addition, the Company estimates the standalone selling price for certain performance obligations where observable prices are not directly available or a significant portion of historical prices are not within the range. In instances where standalone selling price was not determined based on the range of historical observable prices for goods and services sold separately, the Company used an adjusted market assessment approach to estimate the standalone selling price. In such cases the Company has considered market conditions and other observable inputs, such as internal price lists, peer data, and industry data for a similar or identical product. The Company estimates standalone selling price at contract inception considering all information that is reasonably available and is based on the amount of consideration for which the Company expects to be entitled in exchange for transferring the promised good or service to the customer. The corresponding revenues are recognized as the related performance obligations are satisfied.

The Company’s contracts do not include a significant financing component requiring adjustment to the transaction price. Payment terms vary by contract type; however, arrangements typically stipulate a requirement for the customer to pay within 30 days.

The Company rarely enters into agreements to modify previously executed contracts, which constitute contract modifications. The Company assesses each of these contract modifications to determine (i) if the additional products and services are distinct from the products and services in the original arrangement; and (ii) if the amount of consideration expected for the added products and services reflects the stand-alone selling price of those products and services, as adjusted for contract-specific circumstances. A contract modification meeting both criteria is accounted for as a separate contract. A contract modification not meeting both criteria is considered a change to the original contract and is accounted for on either (i) a prospective basis as a termination of the existing contract and the creation of a new contract; or (ii) a cumulative catch-up basis. Generally, the Company’s contract modifications meet both criteria and are accounted for as a separate contract, as adjusted for contract-specific circumstances.

Software related services revenue

Consulting services from product design and development projects are considered distinct performance obligations and 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 using the input method. Revenue from fixed-price engagements is recognized using the output method based on the ratio of costs incurred, to the total estimated project costs.

Client engineering services and Other revenue

Client engineering services revenue are derived from professional services for staffing primarily representing engineers and data scientists located at a customer site. These professional services are considered distinct performance obligations and are provided to customers on a T&M basis. The Company recognizes this revenue for T&M contracts based upon hours worked and contractually agreed upon hourly rates using the input method. No significant judgments were made for revenue recognition within Other revenue.

Disaggregation of revenue

The Company disaggregates its software revenue by type of performance obligation and timing of revenue recognition as follows (in thousands):

	Three Months Ended March 31,
	2020		2019
Software revenue:
Term licenses	$	69,381	$	65,057
Perpetual licenses		8,162		11,564
Maintenance		28,208		22,752
Professional services and other		2,692		3,918
Total software revenue	$	108,443	$	103,291

The Company derived approximately 10% of its total revenue through indirect sales channels for the three months ended March 31, 2020 and 2019.

Software related services revenue, client engineering services revenue, and other revenue were categorized based on the nature and timing of revenue and cash flows.

Costs to obtain a contract

The Company pays commissions for new software product and PCS sales as well as for renewals of existing software and PCS contracts. Commissions paid to obtain renewal contracts are not commensurate with the commissions paid for new product sales and therefore, a portion of the commissions paid for new contracts relate to future renewals.

The Company accounts for new product sales commissions using a portfolio approach and allocates the cost of commissions in proportion to the allocation of transaction price of license and PCS performance obligations. Commissions allocated to the license and license renewal components are expensed at the time the license revenue is recognized. Commissions allocated to PCS are capitalized and amortized on a straight-line basis over a period of four years, reflecting the Company’s estimate of the expected period that it will benefit from those commissions. As of March 31, 2020, and December 31, 2019, capitalized costs to obtain a contract were $2.6 million and $2.3 million, respectively, recorded in prepaid and other current assets, and $0.8 million and $0.8 million, respectively, recorded in other long-term assets. Amortization expense was $0.7 million and $1.0 million for the three months ended March 31, 2020 and 2019, respectively, and was included in sales and marketing expense in the Company’s consolidated statement of operations.

Contract assets

At March 31, 2020 and December 31, 2019, contract assets were $5.5 million and $4.5 million, respectively, recorded in accounts receivable, and $2.6 million and $2.7 million, respectively, recorded in prepaid expenses and other current assets.

Deferred revenue

Deferred revenue consists of billings made or payments received in advance of revenue recognition from software license, PCS and professional services agreements. The timing of revenue recognition may differ from the timing of billings to customers. Payment terms vary by the type and location of customer and the products or services offered. The term between invoicing and when payment is due is not significant. The Company generally invoices its customers annually for the forthcoming year of software licenses, and more frequently for other products and services. Accordingly, the Company’s deferred revenue balance does not include revenue for future years of multiple year non-cancellable contracts that have not yet been billed.

Approximately $36.1 million of revenue recognized during the three months ended March 31, 2020, was included in the deferred revenue balances at the beginning of the year. Revenue allocated to remaining performance obligations represents contracted revenue that has not yet been recognized, which includes deferred revenue and amounts that will be invoiced and recognized as revenue in future periods. Contracted revenue not yet recognized was $120.2 million as of March 31, 2020, of which the Company expects to recognize approximately 77% of the revenue over the next 12 months and the remainder thereafter.

Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Property Plant And Equipment [Abstract]
Depreciation expense, including amortization of right-of-use assets under finance leases	$ 1.8	$ 1.7