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Income Taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred taxes, net |  |
Net operating loss carryforward | $ 469 | $ 324
Accruals | 22 | 22
Reserves | 9 | 11
Property, plant and equipment, and intangible assets | 48 | 28
Stock-based compensation expense | 85 | 132
Other | 4 | 10
Total deferred tax assets | 637 | 527
Valuation allowance | 629 |
Net deferred tax assets | $ 8 | $ 527

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