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Operating expenses - Disclosure of general and administrative expenses (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of attribution of expenses by nature to their function [line items]      
Operating expenses € 185,433 € 131,997 € 69,419
General and administrative expense      
Disclosure of attribution of expenses by nature to their function [line items]      
Personnel costs 19,434 13,105 1,403
Consulting and professional fees 7,990 6,393 2,624
Other expenses 5,522 2,893 3,466
Operating expenses € 32,946 € 22,391 € 7,492