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Note 10 - Income Taxes - Reconciliation of Income Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income tax expense (benefit) at federal statutory rate $ (10,383) $ (6,282)
State income taxes (net of federal benefit) (1,402) (320)
Loss on initial issuance of equity 3,186 0
Change in fair value of common stock warrant liabilities (1,331) (36)
Change in fair value of contingent earn-outs (519) (3,029)
Research and development tax credits 982 423
Stock compensation 431 (170)
Foreign rate differential (80) (261)
Adjustment for change in tax rate (1,277) 0
Other (266) 67
Change in valuation allowance 12,623 10,454
Income tax benefit $ 0 $ 0