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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, 2024
EUR (€)
€ / shares
scenario
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