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Operating expenses - Disclosure of research and development expenses (Details) - EUR (€) € in Thousands | 12 Months Ended
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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

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