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Financial gain (loss) - Narrative (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Financial Gain (Loss) [Line Items]      
Foreign exchange gain (loss) on translation of cash and cash equivalents € 2,382 € (5,072) € 0
United States of America, Dollars      
Disclosure Of Financial Gain (Loss) [Line Items]      
Foreign exchange gain (loss) on translation of cash and cash equivalents 2,035 (3,196)  
Foreign currency translation differences gain (loss) € 714 € (1,488)