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Income Taxes - Significant portions of deferred income tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
NOL carryforwards | $ 30,421 | $ 27,002
Fixed assets and intangibles | 2,371 | 2,306
Accruals | 815 | 108
Inventory | 76 | 229
Other | 87 |
Capitalized R&D expenses | 4,613 |
Stock-based compensation expense | 76 | 63
Total deferred tax assets | 38,459 | 29,708
Deferred tax liabilities: |  |
Prepaid expenses | (101) | (78)
Total deferred income tax assets and liabilities | 38,358 | 29,630
Less: valuation allowance | $ (38,358) | $ (29,630)

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