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Management and assessment of financial risks (Details)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
EUR (€)
financial_institution
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Aug. 20, 2023
Dec. 31, 2022
EUR (€)
Disclosure of credit risk exposure [line items]          
Assets € 584,341 € 205,228 € 327,062    
Cash and cash equivalents € 516,685 € 144,221 € 251,942   € 26,950
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 | Top of range          
Disclosure of credit risk exposure [line items]          
Borrowings, interest rate basis   4.00%   4.00%  
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%  
Credit risk          
Disclosure of credit risk exposure [line items]          
Number of financial institutions to maintain cash | financial_institution 5        
Balances with banks in excess of legally insured limit € 92,482        
Investments in mutual funds and structured notes 437,032        
United States of America, Dollars | Currency risk          
Disclosure of credit risk exposure [line items]          
Assets 327,222        
Cash and cash equivalents 143,180        
Receivables due from related parties 194,712        
Liabilities 24,368        
Payables to related parties € 22,726        
Reasonably possible change in risk variable, percent 10.00%        
Adverse change in exchange rate, impact on foreign exchange loss € 29,747        
Favorable change in exchange rate, impact on foreign exchange gain € 36,358