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Income Taxes - Reconciliation of the statutory U.S. federal income tax rate (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Taxes    
Federal statutory rate (21.00%) (21.00%)
Permanent items 0.08% (0.05%)
Fair market value earnout (2.42%) (4.72%)
Settlement warrants 0.00% 13.35%
Stock compensation (0.01%) (0.02%)
Foreign rate differential 0.33% 0.00%
State taxes (1.62%) (0.05%)
Increase in valuation allowance 24.64% 12.62%
R&D credit   (0.13%)
Effective tax rate 0.00% 0.00%