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Taxes (Components of Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Net operating loss and tax credit carryforwards |  |
Net operating loss and tax credit carryforwards | $ 57,074 | $ 53,092
Depreciation, amortization and impairment of property and equipment | 39 | 61
Stock options | 210 | 153
Right of use asset | (26) | (40)
Lease liability | 26 | 40
Deferred tax assets | 57,323 | 53,306
Valuation allowance for deferred tax assets | (57,323) | (53,306)
Net deferred tax assets | $ 0 | $ 0

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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