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Management and assessment of financial risks (Details)
 12 Months Ended
Dec. 31, 2024
EUR (€)
financial_institution
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Aug. 20, 2023
Disclosure of credit risk exposure [line items]        
Operating expense € 185,433,000 € 131,997,000 € 69,419,000  
Kreos & Claret financing, tranche B and C | European Central Bank base rate        
Disclosure of credit risk exposure [line items]        
Borrowings, adjustment to interest rate basis 7.50%     7.50%
Interest rate collar range 1.50%      
Kreos & Claret financing, tranche B and C | European Central Bank base rate | Bottom of range        
Disclosure of credit risk exposure [line items]        
Borrowings, interest rate basis 2.50%     2.50%
Kreos & Claret financing, tranche B and C | European Central Bank base rate | Top of range        
Disclosure of credit risk exposure [line items]        
Borrowings, interest rate basis 4.00%     4.00%
Currency risk        
Disclosure of credit risk exposure [line items]        
Reasonably possible change in risk variable, impact on foreign exchange     0  
Credit risk        
Disclosure of credit risk exposure [line items]        
Number of financial institutions to maintain cash | financial_institution 2      
Balances with banks in excess of legally insured limit € 143,881,000      
United States of America, Dollars        
Disclosure of credit risk exposure [line items]        
Operating expense € 10,547,000 10,112,000 € 1,390,000  
United States of America, Dollars | Currency risk        
Disclosure of credit risk exposure [line items]        
Reasonably possible change in risk variable, percent 10.00%      
Reasonably possible change in risk variable, impact on foreign exchange € 291,000 € 386,000