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Income Taxes - Effective Income Tax Rate Differs from Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax provision computed at the federal statutory rate	21.00%	35.00%	35.00%
State income tax provision, net of federal benefit	14.53%	2.17%	3.93%
Federal research credits	14.23%	(11.88%)	(8.15%)
Foreign taxes	(11.45%)	(2.27%)	(0.34%)
Tax-exempt income	0.45%	(0.75%)	(0.53%)
State tax incentives	3.15%	(2.71%)	(2.77%)
Stock-based compensation	(2.87%)	1.43%	2.53%
Domestic production activity deduction		(1.13%)	(2.23%)
Bargain purchase	8.82%		(2.64%)
Impact of U.S. tax reform	12.00%	26.70%
Global intangible low-taxed income (GILTI)	(17.48%)
Other, net	(0.34%)	0.09%	0.08%
Effective Tax Rate	42.04%	46.65%	24.88%

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