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Financial liabilities - Disclosure of the main data and assumptions, Kreos / Claret BSA (Details)
€ in Thousands
 12 Months Ended
Nov. 02, 2023
EUR (€)
€ / shares
shares
Aug. 20, 2023
Dec. 31, 2025
scenario
Dec. 31, 2024
EUR (€)
€ / shares
shares
Dec. 31, 2023
EUR (€)
€ / shares
shares
Aug. 22, 2023
EUR (€)
€ / shares
shares
Kreos A & B BSA | Option pricing model | Exercise price per share (in euro per share)            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities       18.67 18.67 18.67
Kreos A & B BSA | Option pricing model | Ordinary share price (in euro per share)            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities       6.76 9.82 17.10
Kreos A & B BSA | Option pricing model | 7-year expiry scenario probability            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities       0.95 0.95 0.50
Kreos A & B BSA | Option pricing model | Volatility, expiry            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities       0.443 0.595 0.719
Kreos A & B BSA | Option pricing model | Volatility, tender offer            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities       0.443 0.649 0.652
Kreos A & B BSA | Option pricing model | Dividend            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities       0 0 0
Kreos A & B BSA | Option pricing model | Risk-free rate            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities         0.0230 0.0300
Kreos A & B BSA | Option pricing model | Risk-free rate, expiry            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities       0.029    
Kreos A & B BSA | Option pricing model | Risk-free rate, tender offer            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities       0.029    
Kreos C BSA | Option pricing model | Exercise price per share (in euro per share)            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities 9.86     9.86 9.86  
Kreos C BSA | Option pricing model | Ordinary share price (in euro per share)            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities 8.89     6.67 9.82  
Kreos C BSA | Option pricing model | 7-year expiry scenario probability            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities 0.95     0.95 0.95  
Kreos C BSA | Option pricing model | Probability of Drawdown of Tranche C credit facility            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities 0.30       0.30  
Kreos C BSA | Option pricing model | Volatility, expiry            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities 0.673     0.443 0.674  
Kreos C BSA | Option pricing model | Volatility, tender offer            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities 0.643     0.443 0.649  
Kreos C BSA | Option pricing model | Dividend            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities 0     0 0  
Kreos C BSA | Option pricing model | Risk-free rate            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities 0.0300       0.0230  
Kreos C BSA | Option pricing model | Risk-free rate, expiry            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities       0.029    
Kreos C BSA | Option pricing model | Risk-free rate, tender offer            
Disclosure Of Warrants Arrangements [Line Items]            
Significant unobservable input, liabilities       0.029    
Kreos A & B BSA            
Disclosure Of Warrants Arrangements [Line Items]            
Number of probability-weighted scenarios | scenario     2      
Expiry scenario period, other equity instruments granted   7 years 7 years      
Number of outstanding warrants (in shares) | shares       214,198 214,198 214,198
Fair value of other equity instruments | €       € 243 € 920 € 2,092
Kreos C BSA            
Disclosure Of Warrants Arrangements [Line Items]            
Expiry scenario period, other equity instruments granted 7 years          
Number of outstanding warrants (in shares) | shares 405,832     405,832 405,832  
Number of outstanding warrants subject to non-market performance condition (in shares) | shares 202,915     0 202,916  
Fair value of other equity instruments | € € 1,493     € 923 € 1,659