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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
us-gaap_RevenueFromContractWithCustomerAbstract    
Collaboration agreement revenue $ 0 $ 55
us-gaap_CostsAndExpensesAbstract    
Research and development 1,530 1,241
Selling, general and administrative 1,196 1,089
Total costs and expenses 2,726 2,330
Operating loss (2,726) (2,275)
us-gaap_NonoperatingIncomeExpenseAbstract    
Total other income (expense), net 14 8
Net loss $ (2,712) $ (2,267)
Net loss per share, basic and diluted (in dollars per share) $ (0.59) $ (1.35)
Weighted-average shares used in computing net loss per share, basic and diluted (in shares) 4,635,764 1,675,539