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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