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Operating expenses - Narrative (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Sales and marketing | € 5,954 | € 6,431 | € 0
Research and development expenses |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Increase in Ulcerative Colitis expenses | 32,030 | 45,233 |
Increase in Crohn's Disease research expenses | 4,620 | 2,734 |
Increase in transversal activities | 8,233 | 4,477 |
General and administrative expense |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Increase in employee benefits expenses | € 6,329 | € 11,702 |

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