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Income Taxes - Tax Rate Reconciliation (Details)
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Income Taxes    
Federal income tax expense at statutory rate (21.00%) 21.00%
Effect of:    
Change in valuation allowance 40.30% 101.10%
Foreign operations permanent difference - foreign exchange gains and losses 2.10% 9.10%
Return to provision true up 2.00% 3.20%
Tax effects of foreign operations 1.20% 35.40%
Increase (decrease) in unrecognized tax benefits (ASC 740) 1.20% (64.40%)
State income tax net of federal benefit 0.20% 1.50%
Change in tax rates   20.60%
Effect of stock-based compensation (1.00%) (62.10%)
Foreign rate differential (6.30%) (19.60%)
Other (0.70%) 5.40%
Effective tax rate 18.00% 51.20%