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Note 12 - Income Taxes - Significant Components of Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Net operating loss carryforwards $ 30,460 $ 26,898
Depreciation and amortization 1,131 1,478
Research and development tax credits 3,808 2,594
Lease liability 1,312 1,158
Right-of-use asset (999) (798)
Capitalized research and development expenses 4,712 0
Non-qualified stock options and restricted stock awards 3,849 2,815
Accrued compensation 396 74
Other 20 19
Total deferred tax assets (liabilities) 44,689 34,238
Less: valuation allowance (44,689) (34,238)
Net deferred tax assets (liabilities) $ 0 $ 0