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Share-based payments - Disclosure of assumptions used for the measurement of BSAs (Details)
1 Months Ended 12 Months Ended
Apr. 22, 2025
shares
€ / shares
Jan. 13, 2025
shares
€ / shares
Apr. 04, 2024
shares
€ / shares
Apr. 30, 2025
shares
Mar. 31, 2024
shares
Dec. 31, 2025
shares
BSA-2024-1            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share)     € 14.06      
NUMBE OF BSAs ( in shares) | shares     58,365   77,820 0
BSA SUBSCRIPTION PRICE (in euro per share)     € 2.57      
STRIKE PRICE PER SHARE ( in euro per share)     € 13.10      
RISK FREE RATE     4.30%      
VOLATILITY     60.41%      
BSA-2024-1 | Minimum            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE BSA (in euro per share)     € 5.7      
EXPECTED MATURITY     5 years 4 months 24 days      
BSA-2024-1 | Maximum            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE BSA (in euro per share)     € 6.5      
EXPECTED MATURITY     6 years 10 months 24 days      
BSA-2024-2            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share)     € 14.06      
NUMBE OF BSAs ( in shares) | shares     19,455     0
BSA SUBSCRIPTION PRICE (in euro per share)     € 2.57      
STRIKE PRICE PER SHARE ( in euro per share)     € 13.10      
RISK FREE RATE     4.30%      
VOLATILITY     60.41%      
BSA-2024-2 | Minimum            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE BSA (in euro per share)     € 5.8      
EXPECTED MATURITY     5 years 6 months      
BSA-2024-2 | Maximum            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE BSA (in euro per share)     € 6.6      
EXPECTED MATURITY     7 years      
BSA-2025-1            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share)   € 6.13        
NUMBE OF BSAs ( in shares) | shares   100,000       100,000
BSA SUBSCRIPTION PRICE (in euro per share)   € 2.00        
STRIKE PRICE PER SHARE ( in euro per share)   € 6.63        
RISK FREE RATE   4.65%        
VOLATILITY   60.88%        
BSA-2025-1 | Minimum            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE BSA (in euro per share)   € 3.5        
EXPECTED MATURITY   5 years 6 months        
BSA-2025-1 | Maximum            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE BSA (in euro per share)   € 3.9        
EXPECTED MATURITY   7 years        
BSA-2025-2            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share)   € 6.13        
NUMBE OF BSAs ( in shares) | shares   25,000       25,000
BSA SUBSCRIPTION PRICE (in euro per share)   € 2.00        
STRIKE PRICE PER SHARE ( in euro per share)   € 6.63        
RISK FREE RATE   4.65%        
VOLATILITY   60.88%        
BSA-2025-2 | Minimum            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE BSA (in euro per share)   € 3.5        
EXPECTED MATURITY   5 years 6 months        
BSA-2025-2 | Maximum            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE BSA (in euro per share)   € 3.9        
EXPECTED MATURITY   7 years        
BSA-2025-3            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) € 6.48          
NUMBE OF BSAs ( in shares) | shares 39,370     39,370   39,370
BSA SUBSCRIPTION PRICE (in euro per share) € 1.27          
STRIKE PRICE PER SHARE ( in euro per share) € 6.41          
RISK FREE RATE 3.92%          
VOLATILITY 60.69%          
BSA-2025-3 | Minimum            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE BSA (in euro per share) € 3.7          
EXPECTED MATURITY 5 years 6 months          
BSA-2025-3 | Maximum            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
FAIR VALUE OF THE BSA (in euro per share) € 4.1          
EXPECTED MATURITY 7 years