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Operating expenses - Narrative (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Research and development expenses |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |
Increase (decrease) in Ulcerative Colitis expenses | € 1,587 | € 32,030
Increase (decrease) in Crohn's Disease research expenses | 10,200 | 4,620
Increase (decrease) in transversal activities | 12,987 | € 8,233
Increase (decrease) in transversal activities, combination therapy | 4,122 |
Increase (decrease) in employer tax and social contributions | 20,131 |
General and administrative expense |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |
Increase (decrease) in employer tax and social contributions | € 27,299 |

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