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Income Taxes (Schedule Of Deferred Tax Assets And Valuation Allowance) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Net operating loss carryforwards $ 28,017 $ 24,777
Share-based compensation 2,706 2,870
Research and development credit carryforwards 9,681 7,439
Capitalized research and development expenses 12,690
Other 934 1,130
Total deferred tax assets 54,028 36,216
Valuation allowance (54,002) (36,166)
Net deferred tax assets 26 50
Deferred tax liabilities:    
Operating lease right-of-use assets (26) (50)
Total deferred tax liabilities (26) (50)
Net deferred tax asset (liability)