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Income Taxes - Tax rate reconciliation (Details)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Taxes    
Federal income tax expense at statutory rate (21.00%) (21.00%)
Effect of:    
Change in valuation allowance 23.80% 35.10%
Tax effects of foreign operations 3.80% 5.90%
Foreign operations permanent difference - foreign exchange gains and losses 3.50% 4.40%
Increase in unrecognized tax benefits (ASC 740) 3.40% 1.10%
Foreign rate differential 0.90% (8.00%)
State income tax net of federal benefit 0.30% 0.20%
Return to provision true up (0.40%) 4.70%
Effect of stock based compensation (1.40%)  
Deemed interest (4.60%) (2.60%)
Other 3.20% (0.10%)
Effective tax rate 11.50% 19.70%