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Trade payables and other current liabilities - Schedule of Deferred Income and Contract Liabilities (Details) - EUR (€)
€ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Subclassifications of assets, liabilities and equities [abstract]    
Non-current refund liabilities € 4,105 € 27,778
Current refund liabilities 3,273 7,835
Refund liabilities € 7,378 € 35,613