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Income Taxes - Deferred tax assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2023
Deferred tax assets: |  |
Net operating loss carryforwards | $ 27,110 | $ 22,068
Inventory | 273 | 287
Accruals | 737 | 863
Depreciation and amortization | 27 | 13
Research and experimental expenditures | 2,229 | 4,728
Stock-based compensation | 270 | 268
Right of use liability | 1,477 | 1,245
Gross deferred tax assets | 32,123 | 29,472
Valuation allowance | (30,328) | (27,748)
Deferred tax assets | 1,795 | 1,724
Deferred tax liabilities: |  |
Right of use asset | (1,463) | (1,226)
Other | (332) | (348)
Deferred tax liabilities | (1,795) | (1,574)
Net deferred tax assets |  | $ 150
(Decrease) increase in valuation allowance | $ (2,600) |

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