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Income Taxes - Effective Income Tax Rate Differs from Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax provision computed at the federal statutory rate	21.00%	21.00%	35.00%
State income tax provision, net of federal benefit	6.97%	14.53%	2.17%
Federal research credits	15.53%	14.23%	(11.88%)
Foreign taxes	2.83%	(11.45%)	(2.27%)
Tax-exempt income	0.49%	0.45%	(0.75%)
State tax incentives	3.85%	3.15%	(2.71%)
Change in valuation allowance	(172.82%)
Foreign tax credits	16.69%
Stock-based compensation	(6.01%)	(2.87%)	1.43%
Domestic production activity deduction			(1.13%)
Bargain purchase		8.82%
Impact of U.S. tax reform		12.00%	26.70%
Global intangible low-taxed income ("GILTI")	(1.87%)	(17.48%)
Other, net	(0.49%)	(0.34%)	0.09%
Effective Tax Rate	(113.83%)	42.04%	46.65%

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