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Taxes (Components of Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Net operating loss and tax credit carryforwards |  |
Net operating loss and tax credit carryforwards | $ 35,772 | $ 33,835
Depreciation, amortization and impairment of property and equipment | 104 | 109
Stock options | 1,481 | 1,482
Right of use asset | (163) |
Lease liability | 176 |
Deferred tax assets | 37,370 | 35,426
Valuation allowance for deferred tax assets | (37,370) | (35,426)
Net deferred tax assets |  |

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