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Income Taxes - Tax Rate Reconciliation (Details)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Income Taxes    
Federal income tax expense (benefit) at statutory rate (21.00%) 21.00%
Effect of:    
Change in valuation allowance 35.10% 26.70%
Foreign operations permanent difference - foreign exchange gains and losses 4.40% 15.40%
State income tax net of federal benefit 0.20% 2.40%
Withholding tax   0.30%
Return to provision true up 4.70% 0.40%
Tax effects of foreign operations 5.90% 85.20%
Increase (decrease) in unrecognized tax benefits (ASC 740) 1.10% (114.90%)
Foreign rate differential (8.00%) (5.80%)
Effect of stock-based compensation   (61.30%)
Other (2.70%) 8.90%
Effective tax rate 19.70% (21.70%)