v3.25.3
Shareholders’ equity - Change in share capital (Details) - € / shares
9 Months Ended
Jul. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Nov. 19, 2024
Disclosure of classes of share capital [line items]        
Capital increase from issuance of ordinary shares (in shares)   11,679,400    
Exercises of share warrants (in shares)     4,000  
Issue of free shares (in shares)   546,905 361,835  
Increase in number of shares issued (in shares)   14,482,230    
Par value per share (in euro per share)   € 0.01   € 0.01
Kreos OCABSA        
Disclosure of classes of share capital [line items]        
Conversion of convertible instruments (in shares)   785,389    
Kreos & Claret financing        
Disclosure of classes of share capital [line items]        
Exercises of share warrants (in shares)   525,913    
Other equity agreements        
Disclosure of classes of share capital [line items]        
Exercises of share warrants (in shares)   24,246    
Heights convertible notes        
Disclosure of classes of share capital [line items]        
Conversion of convertible instruments (in shares)   920,377    
Increase in number of shares issued (in shares) 920,377      
AGAs        
Disclosure of classes of share capital [line items]        
Number of instruments exercised (in shares)   546,905    
BCEs        
Disclosure of classes of share capital [line items]        
Number of instruments exercised (in shares)   24,246