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Operating expenses - Narrative (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]      
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