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Income Taxes (Components of Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Income Taxes [Abstract] |  |
Net operating loss carryforwards | $ 82,050 | $ 74,716
R&D tax credits | 9,072 | 8,711
IRC Section 59e election | 8,412 | 8,577
Start-up costs | 894 | 1,104
Non-qualified stock options | 752 | 350
Property and equipment | 144 | 91
Accrued vacation | 212 | 151
Other | 300 | 59
Total deferred tax assets | 101,836 | 93,759
Valuation allowance | (101,836) | (93,759)
Net deferred tax assets | $ 0 | $ 0

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