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Note 2 - Significant Accounting Policies - Calculation of Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net loss $ (24,342) $ (97,217) $ (76,246)
Weighted average common shares outstanding (in shares) 46,329 41,932 40,202
Net loss per share, basic (in dollars per share) $ (0.53) $ (2.32) $ (1.9)
Adjustment for change in fair value of warrant liabilities $ (43,793) $ 0 $ 0
Adjusted numerator, diluted $ (68,135) $ (97,217) $ (76,246)
Dilutive effect of common stock warrants (in shares) 275 0 0
Weighted average dilutive common shares (in shares) 46,604 41,932 40,202
Net loss per share, diluted (in dollars per share) $ (1.46) $ (2.32) $ (1.9)
Share-Based Payment Arrangement, Option [Member]      
Dilutive common stock options excluded from net loss per share, diluted (in shares) 3,154 2,123 2,055
Warrant [Member]      
Dilutive common stock options excluded from net loss per share, diluted (in shares) 7 7 7