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Inventories (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Inventories      
Raw materials € 24,801 € 23,989  
Increase in inventory 811    
Raw materials write-off 47,129 € 80,021 € 185,832
Inventory piling for pandemic preparedness agreement € 62,082