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Operating expenses - Disclosure of general and administrative expenses (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of attribution of expenses by nature to their function [line items]      
Operating expenses € 250,626 € 185,433 € 131,997
General and administrative expense      
Disclosure of attribution of expenses by nature to their function [line items]      
Personnel costs 52,817 19,434 13,105
Consulting and professional fees 9,984 7,990 6,393
Other general and administrative expenses 4,870 5,522 2,893
Operating expenses € 67,670 € 32,946 € 22,391