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Note 1 - Nature of Activities and Summary of Significant Accounting Policies - Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Net loss $ 30,711 $ (25,279) $ (26,410) $ (66,845) $ (209) $ (18,294) $ (20,978) $ (85,348)
Weighted average shares outstanding—basic (in shares) 38,881     34,769     37,504 34,344
Weighted average dilutive share equivalents from preferred shares (in shares) 126              
Weighted average dilutive share equivalents from stock options (in shares) 2,808              
Weighted average shares outstanding—diluted (in shares) 41,841     34,769     37,504 34,344
Income (loss) per share—basic (in dollars per share) $ 0.79     $ (1.92)     $ (0.56) $ (2.49)
Income (loss) per share—diluted (in dollars per share) $ 0.73     $ (1.92)     $ (0.56) $ (2.49)