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Inventories (Details) - EUR (€)
€ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Inventories      
Inventories € 417 € 373 € 392
Laboratory inventories      
Inventories      
Inventories 426 406 425
Inventories write-down      
Inventories      
Inventories € (9) € (33) € (33)