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Note 11 - Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Loss from operations $ (8,588) $ (8,520) $ (13,258) $ (7,145) $ (8,162) $ (6,389) $ (12,094) $ (7,845) $ (37,510) $ (34,490)
Net loss $ (4,635) $ (7,364) $ (8,742) $ (3,816) $ (3,203) $ (12,658) $ (11,644) $ (5,395) $ (24,557) $ (32,900)
Net loss per share—basic (in dollars per share) $ (0.15) $ (0.24) $ (0.29) $ (0.13) $ (0.1) $ (0.42) $ (0.38) $ (0.18) $ (0.81) $ (1.08)