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Income Taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred taxes, net |  |
Net operating loss carryforward | $ 211 | $ 469
Accruals | 62 | 22
Reserves | 66 | 9
Property, plant and equipment, and intangible assets | 124 | 48
Stock-based compensation expense | 85 | 85
Other | 63 | 4
Total deferred tax assets | 611 | 637
Valuation allowance | (477) | (629)
Net deferred tax assets | $ 134 | $ 8

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