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Income Taxes - Effective Income Tax Rate Differs from Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax provision computed at the federal statutory rate	21.00%	21.00%	21.00%
State income tax provision, net of federal benefit	13.33%	11.10%	6.97%
Federal research credits	53.77%	57.63%	15.53%
Foreign taxes	(4.69%)	(17.83%)	2.83%
Tax-exempt income	3.75%	1.93%	0.49%
State tax incentives			3.85%
Change in valuation allowance	(75.26%)	(44.79%)	(172.82%)
Non-deductible transaction costs	(39.48%)
Foreign tax credits	0.14%	17.90%	16.69%
Stock-based compensation	10.74%	(23.36%)	(6.01%)
Withholding taxes	0.14%	(20.83%)
Alabama law change	(25.39%)
Impact of CARES Act		45.65%
Return to accrual	9.48%
Global intangible low-taxed income ("GILTI")	(4.29%)	(0.49%)	(1.87%)
Other, net	(0.19%)	0.56%	(0.49%)
Effective Tax Rate	(36.95%)	138.05%	(113.83%)

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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