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Subsequent events (Details) - USD ($)
$ / shares in Units, $ in Millions
Jul. 31, 2024
Jul. 30, 2024
May 31, 2024
Jul. 29, 2022
Subsequent events        
Conversion price       $ 1.22
Series C convertible preferred stock        
Subsequent events        
Conversion price     $ 1.22  
Subsequent Event        
Subsequent events        
Number of shares issued 1,800,000      
Net proceeds from issuance of common stock $ 0.5      
Subsequent Event | Common Stock        
Subsequent events        
Conversion of stock (in shares)   888,072    
Conversion price   $ 1.22    
Subsequent Event | Series C convertible preferred stock        
Subsequent events        
Conversion of stock (in shares)   135,431