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Income Taxes (Components of Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Income Taxes [Abstract] |  |
Net operating loss carryforwards | $ 89,173 | $ 82,050
R&D tax credits | 9,664 | 9,072
Capitalized R&D expenses | 8,963 | 8,412
Non-qualified stock options | 1,473 | 752
Start-up costs | 680 | 894
Accrued vacation | 179 | 212
Property and equipment | 59 | 144
Other | 361 | 300
Total deferred tax assets | 110,552 | 101,836
Valuation allowance | (110,552) | (101,836)
Net deferred tax assets | $ 0 | $ 0

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