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Financial liabilities - Royalty certificates (Details)
€ / shares in Units, € in Thousands
12 Months Ended 145 Months Ended
Dec. 31, 2024
EUR (€)
€ / shares
Dec. 31, 2023
EUR (€)
€ / shares
Oct. 24, 2023
€ / shares
shares
Feb. 22, 2023
EUR (€)
€ / shares
shares
Sep. 02, 2022
EUR (€)
transaction
€ / shares
shares
Dec. 31, 2025
EUR (€)
€ / shares
shares
Dec. 31, 2024
EUR (€)
€ / shares
Dec. 31, 2023
EUR (€)
€ / shares
shares
Dec. 31, 2022
EUR (€)
Dec. 31, 2025
EUR (€)
€ / shares
Sep. 30, 2025
Nov. 19, 2024
€ / shares
Jun. 21, 2024
€ / shares
Mar. 28, 2024
€ / shares
Nov. 02, 2023
€ / shares
Aug. 24, 2023
€ / shares
Aug. 20, 2023
€ / shares
May 24, 2023
€ / shares
Disclosure of detailed information about borrowings [line items]                                    
Capital increase from issuance of ordinary shares       € 130,000   € 637,462   € 353,377                    
Capital increase from issuance of ordinary shares (in shares) | shares     20,325,500 20,000,000   11,679,400   40,325,500                    
Par value per share (in euro per share) | € / shares € 0.01 € 0.01 € 0.01 € 0.01   € 0.01 € 0.01 € 0.01   € 0.01   € 0.01           € 0.01
Equity issuance, subscripion price per share (in euro per share) | € / shares       € 6.50                            
Net proceeds from sale of royalty certificates         € 2,931         € 2,900                
Royalty certificate, percentage of future sales         2.00%                          
Royalty certificate, maximum amount         € 172,000                          
Share issue related cost               € 28,111                    
Increase (decrease) through amortization cost remeasurement           € 11,278 € (3,404) 5,878                    
Interest expense on royalty certificates, including the unwinding of discount             794 8,942                    
Unwinding of discount on royalties             4,198                      
Financial liabilities, at fair value € 162,256 € 125,191       € 141,409 € 162,256 € 125,191   € 141,409                
Discount rate                                    
Disclosure of detailed information about borrowings [line items]                                    
Percentage of reasonably possible increase in unobservable input, liabilities           1.00%       1.00%     1.00% 1.00%        
Ordinary share price (in euro per share)                                    
Disclosure of detailed information about borrowings [line items]                                    
Amount of reasonably possible increase in unobservable input, liabilities (in euro per share) | € / shares € 1 € 1       € 1 € 1 € 1   € 1     € 1 € 1 € 1 € 1 € 1  
Royalty certificates                                    
Disclosure of detailed information about borrowings [line items]                                    
Increase (decrease) through amortization cost remeasurement           € 11,286 € (3,404) € 6,421                    
PREMIUMS RELATED TO SHARE CAPITAL                                    
Disclosure of detailed information about borrowings [line items]                                    
Capital increase from issuance of ordinary shares           637,345   € 352,974                    
Royalty certificates                                    
Disclosure of detailed information about borrowings [line items]                                    
Notional amount         € 49,162                          
Other liabilities, number of transactions | transaction         2                          
Capital increase from issuance of ordinary shares         € 46,231                          
Capital increase from issuance of ordinary shares (in shares) | shares         5,530,000                          
Par value per share (in euro per share) | € / shares         € 0.01                          
Equity issuance, subscripion price per share (in euro per share) | € / shares         € 8.36                          
Royalty certificate, percentage of future sales         2.00%                          
Royalty certificate, maximum amount         € 172,000                          
Royalty certificates, EIR 34.00% 34.00%         34.00% 34.00%     34.00%              
Financial liabilities, at fair value € 7,313 € 12,395       € 102,001 € 7,313 € 12,395   € 102,001                
Unobservable input, liabilities, discount rate           7.50%       7.50%                
Royalty certificates | POS                                    
Disclosure of detailed information about borrowings [line items]                                    
Percentage of reasonably possible increase in unobservable input, liabilities 0.05% 0.05%       0.05% 0.05% 0.05%   0.05%                
Increase (decrease) in carrying value due to reasonably possible increase in unobservable input liabilities           € 809                        
Percentage of reasonably possible decrease in unobservable input, liabilities (0.05%) (0.05%)       (0.05%) (0.05%) (0.05%)   (0.05%)                
Increase (decrease) in carrying value due to reasonably possible decrease in unobservable input liabilities           € (1,712)                        
Increase (decrease) in financial liabilities at fair value due to reasonably possible increase in unobservable input € 572 € 1,104       5,810                        
Increase (decrease) in financial liabilities at fair value due to reasonably possible decrease in unobservable input € (572) € (1,104)       € (5,810)                        
Royalty certificates | Peak penetration                                    
Disclosure of detailed information about borrowings [line items]                                    
Percentage of reasonably possible increase in unobservable input, liabilities 5.00% 5.00%       5.00% 5.00% 5.00%   5.00%                
Increase (decrease) in carrying value due to reasonably possible increase in unobservable input liabilities           € 2,616                        
Percentage of reasonably possible decrease in unobservable input, liabilities (5.00%) (5.00%)       (5.00%) (5.00%) (5.00%)   (5.00%)                
Increase (decrease) in carrying value due to reasonably possible decrease in unobservable input liabilities           € (4,154)                        
Increase (decrease) in financial liabilities at fair value due to reasonably possible increase in unobservable input € 1,735 € 1,757       2,830                        
Increase (decrease) in financial liabilities at fair value due to reasonably possible decrease in unobservable input € (2,527) € (2,311)       € (5,590)                        
Royalty certificates | WACC                                    
Disclosure of detailed information about borrowings [line items]                                    
Percentage of reasonably possible increase in unobservable input, liabilities 1.00% 1.00%       1.00% 1.00% 1.00%   1.00%                
Percentage of reasonably possible decrease in unobservable input, liabilities (1.00%) (1.00%)       (1.00%) (1.00%) (1.00%)   (1.00%)                
Increase (decrease) in financial liabilities at fair value due to reasonably possible increase in unobservable input € (314) € (577)       € (4,940)                        
Increase (decrease) in financial liabilities at fair value due to reasonably possible decrease in unobservable input € 332 € 612       € 5,251                        
Royalty certificates | Ordinary share price (in euro per share)                                    
Disclosure of detailed information about borrowings [line items]                                    
Amount of reasonably possible increase in unobservable input, liabilities (in euro per share) | € / shares € 1 € 1         € 1 € 1                    
Increase (decrease) in financial liabilities at fair value due to reasonably possible increase in unobservable input € 1,160 € 1,325                                
Amount of reasonably possible decrease in unobservable input, liabilities (in euro per share) | € / shares € (1) € (1)         € (1) € (1)                    
Increase (decrease) in financial liabilities at fair value due to reasonably possible decrease in unobservable input € (1,160) € (1,325)                                
Royalty certificates | PREMIUMS RELATED TO SHARE CAPITAL                                    
Disclosure of detailed information about borrowings [line items]                                    
Share issue related cost                 € 3,280