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Operating expenses - Disclosure of sales and marketing expenses (Details) - EUR (€)
€ in Thousands
 12 Months Ended
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
Sales and marketing expenses      
Disclosure of attribution of expenses by nature to their function [line items]      
Personnel costs 3,347 2,323 1,710
Consulting and professional fees 1,623 2,699 4,012
Other sales and marketing expenses 224 932 709
Operating expenses € 5,194 € 5,954 € 6,431