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Income Taxes - Effective Income Tax Rate Differs from Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax provision computed at the federal statutory rate	35.00%	35.00%	35.00%
State income tax provision, net of federal benefit	2.17%	3.93%	4.86%
Federal research credits	(11.88%)	(8.15%)	(12.55%)
Foreign taxes	(2.27%)	(0.34%)	2.10%
Tax-exempt income	(0.75%)	(0.53%)	(1.94%)
State tax incentives	(2.71%)	(2.77%)	(5.04%)
Stock-based compensation	1.43%	2.53%	6.91%
Domestic production activity deduction	(1.13%)	(2.23%)	(3.17%)
Bargain purchase		(2.64%)
Impact of U.S. tax reform	26.70%
Other, net	0.09%	0.08%	1.30%
Effective Tax Rate	46.65%	24.88%	27.47%

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