v3.25.2
Financial liabilities - Kreos / Claret Financing (Details)
€ / shares in Units, € in Thousands
 6 Months Ended 12 Months Ended
Aug. 28, 2025
shares
Aug. 06, 2025
shares
Nov. 02, 2023
shares
Aug. 20, 2023
EUR (€)
tranche
shares
Jun. 30, 2025
EUR (€)
€ / shares
Dec. 31, 2024
EUR (€)
€ / shares
Volatility            
Disclosure of detailed information about borrowings [line items]            
Percentage of reasonably possible increase in unobservable input, liabilities         1.00% 1.00%
Volatility | Kreos/Claret Minimum Return Indemnifications            
Disclosure of detailed information about borrowings [line items]            
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets         € 1 € (1)
Volatility | Kreos A & B & C BSA            
Disclosure of detailed information about borrowings [line items]            
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets         € 34 € 37
Ordinary share price (in euro per share)            
Disclosure of detailed information about borrowings [line items]            
Amount of reasonably possible increase in unobservable input, liabilities | € / shares         € 1 € 1
Ordinary share price (in euro per share) | Kreos/Claret Minimum Return Indemnifications            
Disclosure of detailed information about borrowings [line items]            
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets         € (82) € (3)
Ordinary share price (in euro per share) | Kreos A & B & C BSA            
Disclosure of detailed information about borrowings [line items]            
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets         € 391 € 350
Risk-free rate            
Disclosure of detailed information about borrowings [line items]            
Percentage of reasonably possible increase in unobservable input, liabilities         1.00% 1.00%
Risk-free rate | Kreos/Claret Minimum Return Indemnifications            
Disclosure of detailed information about borrowings [line items]            
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets         € (6) € (3)
Risk-free rate | Kreos A & B & C BSA            
Disclosure of detailed information about borrowings [line items]            
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets         € 50 € 61
Final redemption scenario probability            
Disclosure of detailed information about borrowings [line items]            
Percentage of reasonably possible increase in unobservable input, liabilities         10.00% 10.00%
Final redemption scenario probability | Kreos/Claret Minimum Return Indemnifications            
Disclosure of detailed information about borrowings [line items]            
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets         € (6) € 3
Discount rate            
Disclosure of detailed information about borrowings [line items]            
Percentage of reasonably possible increase in unobservable input, liabilities         1.00% 1.00%
Discount rate | Kreos/Claret Minimum Return Indemnifications            
Disclosure of detailed information about borrowings [line items]            
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets         € (60) € (82)
7-year expiry scenario probability            
Disclosure of detailed information about borrowings [line items]            
Percentage of reasonably possible increase in unobservable input, liabilities         10.00% 10.00%
7-year expiry scenario probability | Kreos A & B & C BSA            
Disclosure of detailed information about borrowings [line items]            
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets         € 103 € 75
Kreos A-B and C            
Disclosure of detailed information about borrowings [line items]            
Expiry scenario period, other equity instruments granted         7 years 7 years
Kreos & Claret financing            
Disclosure of detailed information about borrowings [line items]            
Borrowings, number of tranches | tranche       3    
Borrowings, maximum borrowing capacity per tranche       € 25,000    
Kreos & Claret financing | Kreos A & B BSA            
Disclosure of detailed information about borrowings [line items]            
Number of warrants granted (in shares) | shares       214,198    
Kreos & Claret financing | Kreos C BSA            
Disclosure of detailed information about borrowings [line items]            
Number of warrants granted (in shares) | shares     405,832      
Kreos & Claret convertible notes (OCABSA) | Ordinary shares | Major ordinary share transactions            
Disclosure of detailed information about borrowings [line items]            
Number of ordinary shares issued (in shares) | shares   785,389        
Kreos A & B & C BSA | Ordinary shares | Major ordinary share transactions            
Disclosure of detailed information about borrowings [line items]            
Number of ordinary shares issued (in shares) | shares   319,251        
Kreos A & B BSA | Ordinary shares | Major ordinary share transactions            
Disclosure of detailed information about borrowings [line items]            
Number of ordinary shares issued (in shares) | shares 319,251          
Kreos C BSA | Ordinary shares | Major ordinary share transactions            
Disclosure of detailed information about borrowings [line items]            
Number of ordinary shares issued (in shares) | shares 206,662