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Income Taxes - Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Taxes    
Federal income tax expense (benefit) at statutory rate (21.00%) 21.00%
Effect of:    
Change in valuation allowance 186.10% 137.70%
Effect of Section 162 (m) 29.90%  
Change in tax rates 12.20% (172.70%)
Foreign operations permanent difference - foreign exchange gains and losses 9.50% (1.30%)
State income tax net of federal benefit 1.90% (4.30%)
Withholding tax   1.50%
Deemed interest (1.40%) (2.10%)
Return to provision true up (2.30%) (10.80%)
Tax effects of foreign operations 2.00% 57.70%
Increase in unrecognized tax benefits (ASC 740) (22.80%) 31.50%
Foreign rate differential (31.80%) (8.60%)
Effect of stock-based compensation (72.10%) (10.90%)
Other (2.80%) (0.30%)
Effective tax rate 87.40% 38.40%