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Taxes (Components of Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Net operating loss and tax credit carryforwards |  |
Net operating loss and tax credit carryforwards | $ 42,012 | $ 35,772
Depreciation, amortization and impairment of property and equipment | 39 | 104
Stock options |  | 1,481
Right of use asset | (183) | (163)
Lease liability | 195 | 176
Deferred tax assets | 42,063 | 37,370
Valuation allowance for deferred tax assets | (42,063) | (37,370)
Net deferred tax assets |  |

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