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Income Taxes - Deferred taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Income Taxes |  |
Net operating loss carry forwards | $ 16,044 | $ 14,620
Accrued liabilities | 22 | 90
Stock compensation | 263 | 120
Depreciation | 26 | (10)
Prepaid expenses | 43 | 20
Other | (10) | (10)
Deferred tax assets, net | 16,388 | 14,830
Valuation allowance | (16,388) | (14,830)
Net deferred tax asset | $ 0 | $ 0

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