v3.26.1
Cash and cash equivalents - Narrative (Details) - EUR (€)
€ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Disclosure Of Cash And Cash Equivalents [Line Items]      
Notice accounts € 4,147 € 5,744  
Effect of movements in exchange rates on cash held (7,415) € 700  
United States of America, Dollars      
Disclosure Of Cash And Cash Equivalents [Line Items]      
Effect of movements in exchange rates on cash held € (2,500)   € 8,639