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Share capital - Free Share Plans (Details)
12 Months Ended
Jun. 27, 2023
shares
€ / shares
Mar. 11, 2022
EUR (€)
shares
Dec. 31, 2024
EUR (€)
shares
€ / shares
Dec. 31, 2023
EUR (€)
shares
€ / shares
Dec. 31, 2022
EUR (€)
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of shares issued (in shares)     0    
Par value per share (euro per share) | € / shares     € 0.03 € 0.03  
Capital increase | €     € 0 € 61,641,000 € 0
AGA 2023 - P1          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of shares issued (in shares) 427,110   0 427,110  
Number of warrants (BSAs) exercised (in shares)     0 0  
AGA 2023 - P2          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of shares issued (in shares) 439,210   0 439,210  
Number of warrants (BSAs) exercised (in shares)     0 0  
AGA 2023          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of shares issued (in shares)   293,523      
Vesting requirements for share-based payment arrangement, holding period   1 year      
Vesting requirements for share-based payment arrangement, acquisition period   2 years      
Capital increase | €   € 8,805.69      
AGA          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of shares issued (in shares)     0 866,320  
Maximum term of options granted for share-based payment arrangement in the event of death or disability of optionee   6 months      
Number of warrants (BSAs) exercised (in shares)     293,523 354,510  
BSA          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of shares issued (in shares)     0 0  
Number of warrants (BSAs) exercised (in shares)     0 0  
BSA | Kepler Cheuvreux subscription agreement          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of warrants (BSAs) exercised (in shares)     0    
Executive Board and Employees | AGA 2023 - P1          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of shares issued (in shares) 427,110        
Par value per share (euro per share) | € / shares € 0.03        
Vesting requirements for share-based payment arrangement, holding period 1 year        
Vesting requirements for share-based payment arrangement, acquisition period 2 years        
Executive Board and Employees | AGA 2023 - P2          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of shares issued (in shares) 439,210        
Par value per share (euro per share) | € / shares € 0.03        
Vesting requirements for share-based payment arrangement, holding period 1 year        
Vesting requirements for share-based payment arrangement, acquisition period 2 years