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Income Taxes (Details 3) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Effective income tax rate reconciliation |  |  |
Expense (benefit) at U.S. federal statutory rate (as a percentage) | 21.00% | 21.00% | 21.00%
Expense (benefit) at state statutory rate (as a percentage) | 2.20% | (2.50%) | 1.00%
Withholding tax (as a percentage) | 4.40% | (4.10%) | (3.70%)
Foreign rate differential (as a percentage) | 3.30% | (4.80%) | (1.10%)
Research and development ("R&D") credit (as a percentage) | (7.10%) | (4.80%) | 1.20%
Executive compensation (as a percentage) | 6.60% | (1.80%) | (1.20%)
Non-deductible stock-based compensation (as a percentage) | (7.70%) | 0.60% | (2.40%)
Foreign tax credit (as a percentage) | (84.00%) | (89.50%) | 3.60%
Foreign-derived intangible income deduction (as a percentage) | (55.80%) | 13.70% | 5.00%
Divestiture (as a percentage) | 0.00% | (20.40%) | 5.10%
Acquisition (as a percentage) | 8.80% | 0.00% | 0.00%
Other (as a percentage) | (0.20%) | 0.80% | (0.40%)
Valuation allowance (as a percentage) | 129.80% | 81.00% | (32.20%)
Effective income tax rate reconciliation (as a percentage) | 21.30% | (10.80%) | (4.10%)

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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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