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v3.20.4

Income Taxes (Details 3) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Effective income tax rate reconciliation |  |  |
Expense (benefit) at U.S. federal statutory rate (as a percent) | 21.00% | 21.00% | 21.00%
Expense (benefit) at state statutory rate (as a percent) | (2.50%) | 0.90% | (1.20%)
Withholding tax (as a percent) | (3.70%) | (3.50%) | (7.70%)
Foreign rate differential (as a percent) | (4.40%) | (1.60%) | (0.20%)
Research and development ("R&D") credit (as a percent) | (4.40%) | 1.20% | 2.20%
Executive compensation (as a percent) | (1.70%) | (1.20%) | (0.10%)
Non-deductible stock-based compensation (as a percent) | 0.60% | (2.30%) | (2.80%)
Foreign tax credit (as a percent) | (85.70%) | 3.40% | 7.70%
Foreigh derived intangible income deduction (as a percent) | 12.30% | 4.60% | 14.80%
Divestiture (as a percent) | (18.80%) | 4.80% | 0.00%
Other (as a percent) | 0.70% | 0.30% | 0.70%
Valuation allowance (as a percent) | 76.60% | (31.50%) | (158.00%)
Effective Income Tax Rate Reconciliation, Percent | (10.00%) | (3.90%) | (123.60%)

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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=116825942&loc=d3e330036-122817 Reference 2: 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=84230637&loc=d3e32687-109319 + Details
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