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Note 10 - Income Taxes - Significant Components of Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Net operating loss carryforwards $ 35,246 $ 30,460
Depreciation and amortization 1,281 1,131
Research and development tax credits 5,538 3,808
Lease liability 1,335 1,312
Right-of-use asset (1,016) (999)
Capitalized research and development expenses 8,424 4,712
Non-qualified stock options and restricted stock awards 6,037 3,849
Accrued compensation 510 396
Other (40) 20
Total deferred tax assets (liabilities) 57,315 44,689
Less: valuation allowance (57,315) (44,689)
Net deferred tax assets (liabilities) $ 0 $ 0