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Taxes - Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Taxes    
Federal income tax expense at statutory rate 21.00% 21.00%
Effect of:    
Foreign operations permanent difference- foreign exchange gains and losses (24.80%) 27.80%
Return to provision true - up (5.20%)  
2017 Tax Act   (112.60%)
Tax effects of foreign operations 120.80% 58.80%
Increase in unrecognized tax benefits (ASC 740) 109.70% 22.20%
Change in valuation allowance 23.90% 68.30%
Withholding tax 12.20% 7.80%
State income tax net of federal benefit 2.60% 2.40%
Foreign rate differential 1.60% 25.60%
Others (13.20%) (5.50%)
Effective tax rate (expense) 206.60% 115.80%