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Income Taxes - Reconciliation of Statutory Tax Rate to Effective Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |
U.S. federal statutory income tax rate |  | 21.00% | 21.00% | 21.00%
State and local income taxes, net of federal benefit |  | (5.30%) | (15.70%) | 1.70%
Foreign income at other than U.S. rates | [1] | 14.20% | 10.90% | 10.50%
Stock-based compensation |  | (29.90%) | (59.60%) | (20.50%)
Meals and entertainment |  | 0.20% | 0.20% | 0.70%
Nondeductible compensation |  | 1.70% | 0.60% | (1.30%)
Research and development credit |  | (15.30%) | (14.10%) | (5.00%)
Other permanent items |  | 0.50% | 0.10% | (0.30%)
Benefit from carryback of NOLs |  |  | (11.80%) |
Effective income tax rate |  | (12.90%) | (68.40%) | 6.80%
[1] | For the years ended December 31, 2021, 2020, and 2019, includes the impact of the valuation allowance associated with the United Kingdom (“U.K.”). For additional information, see discussion below.

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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