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Income Taxes - Tax rate reconciliation (Details)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Income Taxes    
Federal income tax expense at statutory rate 21.00% 21.00%
Effect of:    
Section 162 (m) 57.60% 452.00%
Global Intangible Low-Taxed Income (GILTI) 3.10% 0.00%
Tax effects of foreign operations 1.50% 562.60%
Return to provision true up 0.80% 264.40%
Foreign operations permanent differences - foreign exchange gains and losses 0.60% 76.90%
Withholding tax 0.50% 106.60%
Research and development credit   (67.30%)
Tax effect of intercompany settlement   (234.00%)
Deemed interest (0.60%) (149.20%)
Foreign rate differential (0.90%) (102.50%)
State income tax net of federal benefit (1.80%) 0.10%
Increase (decrease) in unrecognized tax benefits (ASC 740) (3.80%) 199.60%
Change in valuation allowance (30.70%) 578.60%
Effect of stock-based compensation (64.80%) (961.60%)
Other 0.40% (7.60%)
Effective tax rate (17.10%) 739.60%