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Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenue:        
Collaboration agreement revenue $ 0 $ 0 $ 0 $ 58
Costs and expenses:        
Research and development 936 931 3,834 2,972
Selling, general and administrative 552 825 2,431 2,766
Total costs and expenses 1,488 1,756 6,265 5,738
Operating loss (1,488) (1,756) (6,265) (5,680)
Other income (expense):        
Total other income, net 5 19 21 30
Net loss $ (1,483) $ (1,737) $ (6,244) $ (5,650)
Net loss per share, basic and diluted (in dollars per share) $ (0.24) $ (0.61) $ (1.17) $ (2.65)
Weighted-average shares used in computing net loss per share, basic and diluted (in shares) 6,277,848 2,827,492 5,330,465 2,129,258