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General Information - Revision of comparative figures (Details) - EUR (€)
€ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Equity attributable to owners of the Company € 57,071   € 57,071   € 88,560  
Deferred income 41,519   41,519   51,371  
Revenue 2,882 € 3,843 11,218 € 14,598    
Result for the period (11,006) (8,108) (33,264) (18,458)    
Equity 57,071 24,982 57,071 24,982 88,560 € 41,390
Changes in working capital 3,074 (1,117) 10,974 12,721    
Accumulated Deficit            
Result for the period     (33,264) (18,458)    
Equity € (458,706) € (418,023) € (458,706) € (418,023) € (427,158) € (400,850)