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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenue, Product and Service [Extensible Enumeration]   Collaboration Agreement [Member]    
Total revenue $ 3 $ 43 $ 58 $ 107
Research and development 800 2,314 2,041 4,698
Selling, general and administrative 852 1,181 1,941 2,371
Total costs and expenses 1,652 3,495 3,982 7,069
Operating loss (1,649) (3,452) (3,924) (6,962)
Total other income, net 3 28 11 37
Net loss $ (1,646) $ (3,424) $ (3,913) $ (6,925)
Net loss per share, basic and diluted (in dollars per share) $ (0.88) $ (2.52) $ (2.2) $ (5.12)
Weighted-average shares used in computing net loss per share, basic and diluted (in shares) 1,877,069 1,358,968 1,776,305 1,352,094