v3.26.1
Share based compensation - Equity-settled share-based compensation - Restricted Stock Units (Details)
€ / shares in Units, € in Millions
6 Months Ended 12 Months Ended
Jun. 10, 2026
shares
director
Jun. 11, 2025
shares
director
Jun. 12, 2024
shares
director
Jun. 30, 2026
EUR (€)
shares
€ / shares
Dec. 31, 2025
EUR (€)
€ / shares
Dec. 31, 2024
€ / shares
Share-Based Compensation            
Expense from equity-settled share-based payment transactions | €       € 2.4 € 2.9  
Fair value of the re-priced warrants | €       € 0.9    
RSU            
Share-Based Compensation            
Granted | shares 358,267 146,531 103,642      
Subscription price per share | € / shares       € 0.1718 € 0.1718 € 0.1718
Number of directors | director 7 7 7      
Number of outstanding warrants | shares       358,267