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Income Taxes - Schedule of Differences Between Income Taxes Computed at the Federal Statutory Rate and the Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Expected income tax benefit at the federal statutory rate	$ 12,955	$ 17,166	$ 15,761
State taxes net of federal benefit	5,155	5,150	916
Stock-based compensation	17,575	10,939	(2,001)
Difference in foreign tax rates	435	988	415
U.S. tax credits	1,763	1,717	1,609
Convertible debt and acquisition		11,573
Federal rate change		(49,123)
Transition tax		(1,063)
GILTI inclusion	(1,177)
Meals & entertainment	(1,411)	(745)	(612)
Change in valuation allowance	(37,059)	13,988	(16,413)
Other	(104)	(265)	(208)
Total income tax benefit (provision)	$ (1,868)	$ 10,325	$ (533)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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