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Income Taxes - Tax Rate Reconciliation (Details)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Taxes    
Federal income tax expense at statutory rate 21.00% 21.00%
Effect of:    
Tax effects of foreign operations 85.20% 242.70%
Change in valuation allowance 26.70% (78.50%)
Foreign operations permanent difference - foreign exchange gains and losses 15.40% 144.30%
State income tax net of federal benefit 2.40% 16.20%
Return to provision true up 0.40% (50.60%)
Withholding tax 0.30% 9.30%
Foreign rate differential (5.80%) (34.70%)
Effect of stock based compensation (61.30%) 0.00%
Increase (decrease) in unrecognized tax benefits (ASC 740) (114.90%) 67.10%
Other 8.90% (12.80%)
Effective tax rate (21.70%) 324.00%