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Income Taxes - Tax Rate Reconciliation (Details)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Income Taxes    
Federal income tax expense at statutory rate (21.00%) (21.00%)
Effect of:    
Change in valuation allowance (660.00%) (15.10%)
Foreign rate differential (295.90%) (1.80%)
Return to provision true up (14.80%) (0.30%)
Withholding tax 0.00% 4.50%
State income tax net of federal benefit (120.10%) 1.80%
Foreign operations permanent difference - foreign exchange gains and losses 90.30% (39.30%)
Increase in unrecognized tax benefits (ASC 740) 410.50% 30.80%
Tax effects of foreign operations 1610.60% 84.80%
Effect of share based compensation 263.70% 0.00%
Others 29.00% (4.20%)
Effective tax rate 1292.30% 40.20%