v3.26.1
Goodwill and impairment of goodwill - Roll-forward (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Goodwill and impairment of goodwill    
Goodwill at beginning of period € 70,010 € 69,557
Impairment of goodwill (69,404)  
Exchange differences on goodwill € (606) 453
Goodwill at end of period   € 70,010