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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Revenue:    
Net product revenue $ 64 $ 60
Costs and expenses:    
Research and development 2,384 2,186
Selling, general and administrative 1,190 1,201
Total costs and expenses 3,574 3,387
Operating loss (3,510) (3,327)
Other income (expense):    
Total other income, net 9 2
Net loss $ (3,501) $ (3,325)
Net loss per share, basic and diluted (in dollars per share) $ (0.17) $ (0.19)
Weighted-average shares used in computing net loss per share, basic and diluted (in shares) 20,177,167 17,066,068
Product [Member]    
Revenue:    
Net product revenue $ 0 $ 1
Collaboration Agreement [Member]    
Revenue:    
Net product revenue $ 64 $ 59