Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Geographical Breakdown of Income (Loss) Before Provision for (Benefit From) Income Taxes

The Company’s geographical breakdown of income before income taxes is as follows:

	Year Ended December 31,
	2018		2017		2016
	(in thousands)
Domestic	$	50,010	$	34,914	$	28,982
Foreign	5,458		4,464		1,447
Income before income taxes	$	55,468	$	39,378	$	30,429

Schedule of Provision for (Benefit From) Income Taxes

The provision for (benefit from) income taxes consists of the following:

	Year Ended December 31,
	2018			2017			2016
				(in thousands)
Current
Federal	$	(90	)	$	22		$	8,334
State	62			23			1,125
Foreign	1,988			1,471			963
Total current provision	1,960			1,516			10,422
Deferred
Federal	(3,449		)	(1,650		)	611
State	21			(996		)	126
Foreign	(368		)	68			46
Total deferred (benefit) provision	(3,796		)	(2,578		)	783
Total (benefit from) provision for income taxes	$	(1,836	)	$	(1,062	)	$	11,205

Schedule of Effective Income Tax Rate Reconciliation

The reconciliation of the statutory federal income tax rate to the Company’s effective tax rate is as follows:

	Year Ended December 31,
	2018		2017		2016
Federal statutory rate	21.0	%	35.0	%	35.0	%
State taxes	(1.9	)	(2.1	)	2.1
Stock-based compensation	(20.4	)	(58.1	)	2.4
Foreign source income	(0.2	)	(0.2	)	0.9
Change in valuation allowance	4.4		2.8		1.3
Federal rate adjustment (due to 2017 Tax Act)	—		26.4		—
Federal and state research and development credit	(6.7	)	(5.3	)	(3.6	)
Other	0.5		(1.2	)	(1.3	)
(Benefit from) provision for income taxes	(3.3	)%	(2.7	)%	36.8	%

Schedule of Deferred Tax Assets and Liabilities

	December 31,
	2018			2017
	(in thousands)
Deferred tax assets
Net operating loss carryforwards	$	11,250		$	8,947
Research and development credit carryforwards	16,901			11,493
Foreign tax credit carryforwards	2,209			1,149
Accrued liabilities	2,723			1,470
Deferred revenues	4,200			3,416
Intangible assets	—			405
Stock-based compensation	6,975			7,135
Other	174			196
Gross deferred tax assets	44,432			34,211
Valuation allowance	(9,100		)	(5,773		)
Net deferred tax assets	35,332			28,438
Deferred tax liabilities
Fixed assets	(8,161		)	(3,372		)
Intangible assets	(784		)	—
Total deferred tax liabilities	(8,945		)	(3,372		)
Net deferred tax assets	$	26,387		$	25,066

Schedule of Unrecognized Tax Benefits

	Year Ended December 31,
		2018			2017			2016
Unrecognized tax benefits beginning balance		$	5,112		$	4,071		$	3,506
Gross increase for tax positions of prior years		279			66			2
Gross decrease for tax positions of prior years		(227		)	—			(15		)
Gross increase for tax positions of current year		1,399			1,101			659
Lapse of statute of limitations		(157		)	(126		)	(81		)
Total unrecognized tax benefits		$	6,406		$	5,112		$	4,071