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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, 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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- 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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