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Shareholders' equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Jun. 16, 2025
Jun. 11, 2025
Sep. 30, 2025
Sep. 30, 2024
Subsidiary, Sale of Stock [Line Items]        
Proceeds from the sale of common shares, net of transaction costs     $ 42,760 $ 60,506
Issuance of warrants, underwritten offering, net of transaction costs   $ 50,800 $ 50,760 $ 36,925
2025 Private Placement        
Subsidiary, Sale of Stock [Line Items]        
Sale of stock, issued (in shares)   13,031,161    
Sale of stock, price (in dollars per share)   $ 3.43    
Sale of stock, amount $ 100,000      
Sale of stock, transaction costs 6,900      
Proceeds from the sale of common shares, net of transaction costs $ 93,100      
Additional paid in capital   $ 42,400    
2025 Private Placement | Common Stock        
Subsidiary, Sale of Stock [Line Items]        
Sale of stock, price (in dollars per share)   $ 3.53    
2025 Private Placement | 2025 Pre-Funded Warrant        
Subsidiary, Sale of Stock [Line Items]        
Sale of stock, issued (in shares)   15,734,267