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Note 9 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Net operating loss carryforwards $ 33,322 $ 28,017
Share-based compensation 2,561 2,706
Research and development credit carryforwards 12,557 9,681
Capitalized research and development expenses 27,538 12,690
Other 1,371 934
Total deferred tax assets 77,349 54,028
Valuation allowance (77,349) (54,002)
Net deferred tax assets 0 26
Operating lease right-of-use assets 0 (26)
Total deferred tax liabilities 0 (26)
Net deferred tax asset (liability) $ 0 $ 0