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Income Taxes - Tax Rate Reconciliation (Details)
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Income Taxes    
Federal income tax expense at statutory rate 21.00% 21.00%
Effect of:    
Change in valuation allowance 25.20% 10.90%
Foreign rate differential 20.40% (0.10%)
Return to provision true up 1.80% 0.40%
Withholding tax (3.90%)  
State income tax net of federal benefit (5.90%)  
Foreign operations permanent difference - foreign exchange gains and losses (44.40%) 53.40%
Increase in unrecognized tax benefits (ASC 740) (58.00%) (27.70%)
Tax effects of foreign operations (131.80%) (61.30%)
Other 1.90% (3.50%)
Effective tax rate (173.70%) (6.90%)