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Financial liabilities - Disclosure of the main data and assumptions, Kreos BSA (Details)
€ in Thousands
May 24, 2023
EUR (€)
€ / shares
yr
shares
Dec. 31, 2022
EUR (€)
€ / shares
yr
shares
Jul. 24, 2018
shares
Kreos A BSA      
Disclosure Of Warrants Arrangements [Line Items]      
Number of outstanding warrants (in shares) | shares 110,957 110,957 110,957
Fair value of other equity instruments | € € 1,261 € 275  
Kreos A BSA | Exercise price per share (in euro per share) | Option pricing model      
Disclosure Of Warrants Arrangements [Line Items]      
Significant unobservable input, liabilities 7.21 7.21  
Kreos A BSA | Ordinary share price (in euro per share) | Option pricing model      
Disclosure Of Warrants Arrangements [Line Items]      
Significant unobservable input, liabilities 18.57 6.18  
Kreos A BSA | Residual maturity | Option pricing model      
Disclosure Of Warrants Arrangements [Line Items]      
Significant unobservable input, liabilities | yr 0 5.6  
Kreos A BSA | Volatility | Option pricing model      
Disclosure Of Warrants Arrangements [Line Items]      
Significant unobservable input, liabilities   0.4401  
Kreos A BSA | Dividend | Option pricing model      
Disclosure Of Warrants Arrangements [Line Items]      
Significant unobservable input, liabilities   0  
Kreos A BSA | Risk-free rate | Option pricing model      
Disclosure Of Warrants Arrangements [Line Items]      
Significant unobservable input, liabilities   0.0298  
Kreos B BSA      
Disclosure Of Warrants Arrangements [Line Items]      
Number of outstanding warrants (in shares) | shares 74,766 74,766 74,766
Fair value of other equity instruments | € € 589 € 149  
Kreos B BSA | Exercise price per share (in euro per share) | Option pricing model      
Disclosure Of Warrants Arrangements [Line Items]      
Significant unobservable input, liabilities 10.70 10.70  
Kreos B BSA | Ordinary share price (in euro per share) | Option pricing model      
Disclosure Of Warrants Arrangements [Line Items]      
Significant unobservable input, liabilities 18.57 6.18  
Kreos B BSA | Residual maturity | Option pricing model      
Disclosure Of Warrants Arrangements [Line Items]      
Significant unobservable input, liabilities | yr 0 6.4  
Kreos B BSA | Volatility | Option pricing model      
Disclosure Of Warrants Arrangements [Line Items]      
Significant unobservable input, liabilities   0.4401  
Kreos B BSA | Dividend | Option pricing model      
Disclosure Of Warrants Arrangements [Line Items]      
Significant unobservable input, liabilities   0  
Kreos B BSA | Risk-free rate | Option pricing model      
Disclosure Of Warrants Arrangements [Line Items]      
Significant unobservable input, liabilities   0.0296