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Income Taxes (Components of Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
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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