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Operating expenses - Disclosure of research and development 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
Research and development expenses      
Disclosure of attribution of expenses by nature to their function [line items]      
Sub-contracting, studies and research 112,033 110,993 85,726
Personnel costs 49,616 18,455 8,048
Consulting and professional fees 12,791 12,581 6,561
Intellectual property fees 1,025 1,741 1,645
Other research and development expenses 2,297 2,761 1,196
Operating expenses € 177,761 € 146,532 € 103,176