v3.26.1
Share-based payments - Narrative (Details)
€ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 112 Months Ended 124 Months Ended
Mar. 05, 2026
EUR (€)
shares
Feb. 28, 2026
shares
Apr. 30, 2025
shares
Jan. 31, 2025
shares
Mar. 31, 2026
shares
Mar. 31, 2026
EUR (€)
shares
Mar. 31, 2026
shares
Mar. 31, 2026
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Unused reversals | €           € 3,445    
AGA EMPLOYER CONTRIBUTIONS AND TAXES                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Unused reversals | € € 2,256         € 3,394    
BSAs                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments issued (in shares)   23,477 39,370 125,000   23,477 510,191  
BSAs | Board member                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Vesting percentage   25.00% 25.00% 25.00%        
Vesting period   4 years 4 years 4 years        
AGAs                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of shares waived (in shares)         77,050 77,050 77,050 77,050
Number of shares with performance conditions waived (in shares)         40,200 40,200 40,200 40,200
Number of shares lapsed (in shares)         217,750 217,750 217,750 217,750
Expense from share-based payment transactions with employees | €           € 11,619    
AGAs | Settlement agreement (Protocole d’accord transactionnel)                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of shares waived (in shares) 117,250              
Total AGAs                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments issued (in shares)           460,845   11,171,743
Total AGAs | Tranche 1                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Vesting percentage         50.00%      
Vesting period         2 years      
Total AGAs | Tranche 2                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Vesting percentage         25.00%      
Vesting period         3 years      
Total AGAs | Tranche 3                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Vesting percentage         25.00%      
Vesting period         4 years      
AGA-2026-1                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments issued (in shares)         47,500      
AGA-2026-2                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments issued (in shares)         294,476      
AGA-2026-3                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments issued (in shares)         1,619