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Income Taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred taxes, net |  |
Net operating loss carryforward | $ 324 | $ 236
Accruals | 22 | 11
Reserves | 11 | 8
Property, plant and equipment, and intangible assets | 28 | 48
Stock-based compensation expense | 132 | 125
Other | 10 | 7
Total deferred tax assets | 527 | 435
Net deferred tax assets | $ 527 | $ 435

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