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Taxes (Components of Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Net operating loss and tax credit carryforwards |  |
Net operating loss and tax credit carryforwards | $ 53,092 | $ 56,593
Depreciation, amortization and impairment of property and equipment | 61 | 34
Stock options | 153 | 67
Right of use asset | (40) | (32)
Lease liability | 40 | 32
Deferred tax assets | 53,306 | 56,694
Valuation allowance for deferred tax assets | (53,306) | (56,694)
Net deferred tax assets | $ 0 | $ 0

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