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Income Taxes - Deferred tax assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Deferred tax assets: |  |
Net operating loss carryforwards | $ 27,110 | $ 30,658
Inventory | 273 | 278
Accruals | 737 | 801
Depreciation and amortization | 27 | 240
Research and experimental expenditures | 2,229 |
Stock-based compensation | 270 | 177
Right of use liability | 1,477 | 206
Gross deferred tax assets | 32,123 | 32,360
Valuation allowance | (30,328) | (32,047)
Deferred tax assets | 1,795 | 313
Deferred tax liabilities: |  |
Right of use asset | (1,463) | (209)
Other | (332) | (104)
Deferred tax liabilities | (1,795) | $ (313)
(Decrease) increase in valuation allowance | $ (1,700) |

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