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Income Taxes - Tax rate reconciliation (Details)
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Income Taxes    
Federal income tax expense at statutory rate (21.00%) (21.00%)
Effect of:    
Change in valuation allowance 51.30% 40.30%
Foreign operations permanent difference - foreign exchange gains and losses 4.70% 2.10%
Tax effects of foreign operations 3.80% 1.20%
Increase in unrecognized tax benefits (ASC 740) 2.60% 1.20%
State income tax net of federal benefit 0.40% 0.20%
Return to provision true up (0.60%) 2.00%
Foreign rate differential (1.50%) (6.30%)
Deemed interest (7.10%)  
Effect of stock based compensation (22.70%) (1.00%)
Other 6.20% (0.70%)
Effective tax rate 16.10% 18.00%