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Borrowings (Details) - EUR (€)
€ in Thousands
1 Months Ended 3 Months Ended
Sep. 30, 2022
Dec. 31, 2023
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Oct. 12, 2018
Disclosure of detailed information about borrowings [line items]            
Total borrowings     € 4,800   € 4,582  
Current portion     4,800   4,582  
Pontifax and Kreos warrants            
Disclosure of detailed information about borrowings [line items]            
Warrants, economic lifetime 5 years          
Innovation credit            
Disclosure of detailed information about borrowings [line items]            
Borrowings excluding accrued interest     2,899   2,899  
Accrued interest     € 1,901   € 1,683  
Current borrowings excluding accrued interest       € 2,899    
Notional amount           € 3,907
Repayment of borrowings   € 1,008        
Total conditional waiver of debt   € 4,292