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Income Taxes - Schedule of Difference Between Benefit for Income Taxes and Federal Statutory Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax at federal statutory rate(1)	$ (20,038)	$ (14,467)	$ (18,553)
State taxes, net	(9,597)	(2,849)	795
Federal rate change	0	0	53,045
Foreign rate differential	(665)	(177)	0
Non-deductible stock-based compensation	2,817	(2,729)	2,120
Research credits	(3,429)	(1,005)	(869)
Change in valuation allowance	29,655	20,271	(36,575)
Other	1,257	956	37
Income tax benefit	$ 0	$ 0	$ 0

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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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