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Income Taxes - Effective Income Tax Rate Differs from Federal Statutory Rate (Detail) | 12 Months Ended
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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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