v3.26.1
Related party transactions - Additional Information (Details)
€ in Thousands
12 Months Ended
Apr. 23, 2025
EUR (€)
collaborationAgreements
Dec. 31, 2025
EUR (€)
director
supervisoryBoard
licensing_agreement
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Apr. 24, 2025
Disclosure of transactions between related parties [Line Items]          
Number of members of the supervisory board not appointed to the board of directors | supervisoryBoard   2      
Number of new members appointed to the board of directors | supervisoryBoard   2      
Number of directors | director   8      
Provision for attendance fees   € 547 € 310 € 353  
Number of licensing agreements | licensing_agreement   3      
Increase capital, net   € 14,932 2,836 0  
Percentage of shareholding in the company 100.00%       100.00%
Financial transactions, related party transactions   0      
Sanofi-Aventis          
Disclosure of transactions between related parties [Line Items]          
Increase capital, net € 15,000        
Percentage of shareholding in the company 9.05%        
Number of collaboration contracts | collaborationAgreements 2        
Novo Nordisk A/S          
Disclosure of transactions between related parties [Line Items]          
Total borrowings   € 0 € 0 € 0