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Income Taxes - components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Accrued compensation | $ 296 | $ 289
Accrued other expense | 123 | 114
Stock compensation | 5,303 | 3,913
Start-up costs and other intangibles | 13,727 | 14,104
Lease liability | 157 | 219
Net operating losses | 20,131 | 13,536
Capitalized Research and Development Expenses | 6,387 |
Other | 32 | 22
Deferred tax assets, gross | 46,156 | 32,197
Less: valuation allowance | (45,928) | (31,939)
Total deferred tax assets | 228 | 258
Deferred tax liabilities: |  |
Depreciation | (89) | (40)
ROU Asset | (139) | (218)
Total deferred tax liabilities | $ (228) | $ (258)

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