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Share-based payments - Prior VSOP - Expenses (Details) - Prior VSOP - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based payments      
Cost of Sales € (9)    
Selling and distribution expenses (6) € (8) € (25)
Research and development expenses 46 (45) (369)
General and administrative expenses (41) (78) (230)
Total € (10) € (131) € (624)