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Note 9 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Net operating loss carryforwards $ 43,148 $ 33,322
Share-based compensation 4,814 2,561
Research and development credit carryforwards 13,789 12,557
Capitalized research and development expenses 33,598 27,538
Other 1,340 1,371
Total deferred tax assets 96,689 77,349
Valuation allowance (96,689) (77,349)
Net deferred tax assets 0 0
Operating lease right-of-use assets 0 0
Total deferred tax liabilities 0 0
Net deferred tax asset (liability) $ 0 $ 0