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Operating expenses - Disclosure of research and development 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
Research and development expenses      
Disclosure of attribution of expenses by nature to their function [line items]      
Sub-contracting, studies and research 110,993 85,726 38,858
Personnel costs 18,455 8,048 3,072
Consulting and professional fees 12,581 6,561 4,246
Intellectual property fees 1,741 1,645 1,187
Other expenses 2,762 1,196 931
Operating expenses € 146,532 € 103,176 € 48,295