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Income Taxes - Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes    
Federal income tax expense (benefit) at statutory rate 21.00% (21.00%)
Effect of:    
Change in valuation allowance 137.70% 22.40%
Increase in unrecognized tax benefits (ASC 740) 31.50% 55.10%
Tax effects of foreign operations 57.70% 59.70%
Foreign operations permanent difference - foreign exchange gains and losses (1.30%) (12.20%)
Deemed interest (2.10%)  
State income tax net of federal benefit (4.30%) 1.30%
Foreign rate differential (8.60%) 0.80%
Effect of share based compensation (10.90%)  
Return to provision true up (10.80%) (2.60%)
Change in rates (172.70%)  
Withholding tax 1.50% 6.00%
Others (0.30%) (7.30%)
Effective tax rate 38.40% 102.20%