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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Total revenue $ 357 $ 212 $ 464 $ 1,246
Research and development 1,872 2,144 6,570 6,634
Selling, general and administrative 1,083 1,128 3,454 3,495
Total costs and expenses 2,955 3,272 10,024 10,129
Operating loss (2,598) (3,060) (9,560) (8,883)
Total other income, net 24 3 61 4
Net loss $ (2,574) $ (3,057) $ (9,499) $ (8,879)
Net loss per share, basic and diluted (in dollars per share) $ (0.12) $ (0.17) $ (0.46) $ (0.51)
Weighted-average shares used in computing net loss per share, basic and diluted (in shares) 21,615,655 17,844,991 20,731,050 17,523,837
Product [Member]        
Total revenue $ 0 $ 2 $ 0 $ 3
Collaboration Agreement [Member]        
Total revenue $ 357 $ 210 $ 464 $ 1,243