XML 63 R45.htm IDEA: XBRL DOCUMENT v3.22.4
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