v3.26.1
Share-based compensation - Disclosure of maturity analysis of available phantom shares outstanding (Details) - Phantom shares
Dec. 31, 2025
shares
€ / shares
Dec. 31, 2024
shares
Dec. 31, 2023
shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of outstanding phantom shares (in shares) 10,000 39,500 410,500
2027      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in € per share) | € / shares € 2.85    
Number of outstanding phantom shares (in shares) 0 6,250  
2029      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in € per share) | € / shares € 3.05    
Number of outstanding phantom shares (in shares) 10,000 33,250