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Subsequent events (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Oct. 31, 2025
USD ($)
shares
Oct. 27, 2025
USD ($)
shares
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Oct. 12, 2025
$ / shares
Subsequent Event [Line Items]          
Proceeds from the sale of common shares, net of transaction costs     $ 42,760 $ 60,506  
Proceeds from Pre-Funded Warrants, net of transaction costs     $ 50,760 $ 36,925  
Subsequent Event          
Subsequent Event [Line Items]          
Class of warrent or right, exchange term (in days) 90 days        
Beneficial ownership maximum term (in days) 61 days        
Gross proceeds from issuance of private placement $ 43,000        
Proceeds from Pre-Funded Warrants, net of transaction costs $ 14,600        
Subsequent Event | Minimum          
Subsequent Event [Line Items]          
Beneficial ownership (as a percent) 0.0999        
Subsequent Event | Maximum          
Subsequent Event [Line Items]          
Beneficial ownership (as a percent) 0.1999        
Subsequent Event | 2025 Pre-Funded Warrant          
Subsequent Event [Line Items]          
Class of warrant or right, outstanding (in shares) | shares 50,000        
Private Placement | Subsequent Event          
Subsequent Event [Line Items]          
Sale of stock, amount   $ 60,000      
Sale of stock, transaction costs   2,400      
Proceeds from the sale of common shares, net of transaction costs   $ 57,600      
Private Placement | Subsequent Event | Common stock          
Subsequent Event [Line Items]          
Sale of stock, issued (in shares) | shares   11,250,000      
Sale of stock, price (in dollars per share) | $ / shares         $ 4.00
Private Placement | Subsequent Event | 2025 Pre-Funded Warrant          
Subsequent Event [Line Items]          
Sale of stock, issued (in shares) | shares   3,846,153      
Sale of stock, price (in dollars per share) | $ / shares         3.90
Warrant exercise price (in dollars per share) | $ / shares         $ 0.08