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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenue:        
Net product revenue $ 43 $ 974 $ 107 $ 1,034
Costs and expenses:        
Research and development 2,314 2,304 4,698 4,490
Selling, general and administrative 1,181 1,166 2,371 2,367
Total costs and expenses 3,495 3,470 7,069 6,857
Operating loss (3,452) (2,496) (6,962) (5,823)
Other income (expense):        
Total other income, net 28 (1) 37 1
Net loss $ (3,424) $ (2,497) $ (6,925) $ (5,822)
Net loss per share, basic and diluted (in dollars per share) $ (0.17) $ (0.14) $ (0.34) $ (0.34)
Weighted-average shares used in computing net loss per share, basic and diluted (in shares) 20,384,522 17,651,892 20,281,417 17,360,598
Product [Member]        
Revenue:        
Net product revenue $ 0 $ 0 $ 0 $ 1
Collaboration Agreement [Member]        
Revenue:        
Net product revenue $ 43 $ 974 $ 107 $ 1,033