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Income Taxes - Difference Between the Effective Tax Rate and the U.S. Federal Statutory Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense at the U.S. federal tax rate	21.00%	21.00%	21.00%
Foreign income tax differential	(20.80%)	(49.20%)	2.10%
U.S. tax on foreign earnings	(16.70%)	(8.40%)	2.00%
State and local income taxes	25.00%	58.20%	(25.00%)
U.S. permanent book/tax differences	(4.20%)	(17.00%)	(2.70%)
U.S. research and development tax credits	25.00%	68.50%	(29.50%)
Change in valuation allowance	(25.00%)	(49.10%)	27.70%
Tax impact of NOL carry-back under the CARES act.	0.792	0	0
Tax impact of equity compensation	(66.70%)	(49.30%)	(1.40%)
Deferred tax impact from intra-entity IP transfer	6.542	0	0
Tax impact of U.S. Tax Reform/Transition Tax	0	0	(0.239)
Tax Impact of uncertain tax positions	(29.20%)	(24.60%)	20.20%
Other, net	(4.30%)	(3.90%)	(1.60%)
Effective income tax rate	637.50%	(53.80%)	(11.10%)

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Effective Income Tax Rate Reconciliation, Early Adoption of ASU 2016-09, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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 changes in the valuation allowance for deferred tax assets.

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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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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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 income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act.

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