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Income Taxes - Components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred tax assets: |  |
Accrued compensation | $ 1,816 | $ 1,302
Leases | 98 | 34
Share-based compensation | 5,702 | 3,163
Research and experimental costs capitalized | 0 | 9,556
Net operating loss carryforwards | 143 | 294
Start-up costs | 232 | 32
Deferred tax assets before valuation allowance | 7,991 | 14,381
Valuation allowance | (6,928) | (12,888)
Deferred Tax Assets, Net of Valuation Allowance, Total | 1,063 | 1,493
Deferred tax liabilities: |  |
Fixed assets | 1,051 | 1,481
Prepaid expenses | 12 | 12
Total deferred income tax liabilities | 1,063 | 1,493
Net deferred tax asset | $ 0 | $ 0

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