v3.26.1
Significant events for the year ended December 31, 2025 and the three-month period ended March 31, 2026 and subsequent events - For the year ended December 31, 2025 (Details)
€ / shares in Units, $ / shares in Units, € in Thousands, $ in Millions
1 Months Ended 3 Months Ended 10 Months Ended 112 Months Ended
Dec. 23, 2025
EUR (€)
Nov. 28, 2025
EUR (€)
Nov. 25, 2025
shares
Aug. 28, 2025
shares
Aug. 08, 2025
shares
Jul. 30, 2025
EUR (€)
note
€ / shares
shares
Jul. 30, 2025
EUR (€)
note
€ / shares
shares
Jul. 28, 2025
USD ($)
shares
Jul. 28, 2025
EUR (€)
€ / shares
shares
Feb. 28, 2026
shares
Apr. 30, 2025
shares
Jan. 31, 2025
shares
Mar. 31, 2026
EUR (€)
shares
Nov. 30, 2025
shares
plan
Mar. 31, 2026
shares
Jul. 28, 2025
$ / shares
Jul. 23, 2025
note
Jun. 30, 2025
€ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Number of free shares plans issued | plan                           8        
Par value per share (in euro per share) | € / shares                 € 57.00                 € 6.64
Number of ordinary shares issued (in shares)                         754,776          
Closing foreign exchange rate                                 1.1726  
Proceeds from issue of ordinary shares               $ 747.5 € 637,500                  
Net proceeds from issuance of ordinary shares               $ 700.3 € 597,200                  
Proceeds from issuing other equity instruments | €                         € 608,100          
Heights convertible notes                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Number of ordinary shares issued (in shares)           920,377                        
Number of convertible notes converted | note           200 200                   150  
Notional amount | €           € 21,900 € 21,900                      
Kreos/Claret Financing B And C                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Repayments of borrowings, classified as financing activities | € € 33,823 € 33,823                                
ADS                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Number of ordinary shares issued (in shares)               11,679,400 11,679,400                  
Issue of equity, offering price per share (in dollar/euro per share) | $ / shares                               $ 64.00    
Ordinary shares                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Issue of equity, offering price per share (in dollar/euro per share) | € / shares                 € 54.58                  
Ordinary shares | Heights convertible notes                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Borrowings, fixed conversion price (euro per share) | € / shares           € 23.7674 € 23.7674                      
Ordinary shares | Kreos & Claret convertible notes (OCABSA)                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Number of ordinary shares issued (in shares)     392,695   785,389                          
Ordinary shares | Kreos A & B & C BSA                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Number of ordinary shares issued (in shares)       206,662     319,251                      
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 period                   4 years 4 years 4 years            
Vesting percentage                   25.00% 25.00% 25.00%            
AGA-2025                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Number of instruments issued (in shares)                           6,280,727        
AGA-2025 | Tranche 1                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Vesting period                           2 years        
Vesting percentage                           50.00%        
AGA-2025 | Tranche 2                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Vesting period                           3 years        
Vesting percentage                           25.00%        
AGA-2025 | Tranche 3                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Vesting period                           4 years        
Vesting percentage                           25.00%        
AGA-2025-2                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Number of instruments issued (in shares)                           123,102        
Vesting period                           2 years        
AGA-2025-5                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Number of instruments issued (in shares)                           50,000        
AGA-2025-1                                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                                    
Number of instruments issued (in shares)                           4,319,500