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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Provision for income taxes [Abstract] |  |
Income taxes using U.S federal statutory rate | $ (10,012) | $ (7,666)
Nondeductible interest | 127 | 139
Branch income | (1,230) | (385)
State income taxes, net of federal benefit | (31) | (531)
Foreign rate differential | 506 | 165
Valuation allowance | 7,099 | 9,221
Stock option expense, exercises and cancellations | 2,899 | 752
Research and development costs | (859) | (708)
Other | (179) | (987)
Derivative Charge | 1,680 | 0
Total | $ 0 | $ 0

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