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Income Taxes (Components of Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
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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