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Operating expenses - Schedule of Research and Development Expenses (Details) - EUR (€)
€ in Thousands
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Analysis of income and expense [abstract]    
Purchases, sub-contracting and other expenses € (7,489) € (15,105)
Payroll costs (including share-based payments) (6,430) (6,199)
Depreciation, amortization, and provision expenses (610) (682)
Total research and development expenses € (14,529) € (21,987)