v3.26.1
Summary of significant transactions - Transfer of assets and financing agreement with ONCO3R Therapeutics BV (Details) - EUR (€)
12 Months Ended
Dec. 31, 2025
Apr. 30, 2025
Summary Of Significant Transaction [line items]    
Convertible Loan € 21,175,000  
Onco3R Therapeutics [member]    
Summary Of Significant Transaction [line items]    
Convertible Loan   € 20,000,000
impairment loss € 1,700,000