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Income Taxes - Tax Rate Reconciliation (Details)
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Income Taxes    
Federal income tax expense (benefit) at statutory rate 21.00% (21.00%)
Effect of:    
Change in valuation allowance 2468.80% (660.00%)
Effect of Section 162 (m) 549.90%  
Foreign operations permanent difference - foreign exchange gains and losses 271.90% 90.30%
Change in tax rates 225.00%  
Tax effects of foreign operations 79.80% 1610.60%
State income tax net of federal benefit 43.20% (120.10%)
Return to provision true up 31.60% (14.80%)
Foreign rate differential (478.80%) (295.90%)
Increase (decrease) in unrecognized tax benefits (ASC 740) (490.00%) 410.50%
Effect of stock-based compensation (1573.20%) 263.70%
Other 22.50% 29.00%
Effective tax rate 1171.70% 1292.30%