v3.25.2
Organization and description of business - Additional Information (Details)
Dec. 31, 2024
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
Employees
Aug. 09, 2023
Employees
Organization And Description Of Business [Line Items]      
Number of reduction in company's current workforce employees | Employees     22
Workforce Reduction Rate     70.00%
Series B non-voting convertible preferred stock | shares | shares 119,318.285    
Accumulated deficit | $ $ (456,363,000) $ (459,030,000)  
Sale of common stock warrants, net of issuance costs, shares | shares | shares 21,070,220    
Common stock plus pre-funded warrants exercisable | shares 23,041,040    
Offering price | $ / shares $ 0.065    
Net proceeds | $ $ 2,900,000    
Debt issuance cost | $ 27,000    
Proceeds from Issuance of Debt | $ $ 600,000    
Common Stock [Member]      
Organization And Description Of Business [Line Items]      
Number of reduction in company's current workforce employees | Employees   3  
Convertible Preferred Stock, Shares Issued upon Conversion | shares 1,000    
Initial Public Offering And Concurrent Private Placements [Member]      
Organization And Description Of Business [Line Items]      
Exercise price | $ / shares | $ / shares $ 0.001