v3.25.4
Shareholders' Equity - Movements in the number of options outstanding (Details)
 12 Months Ended
Dec. 31, 2025
EUR (€)
Option
Y
€ / shares
Dec. 31, 2024
EUR (€)
Option
Y
€ / shares
Dec. 31, 2023
Y
Option
€ / shares
Share options      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average fair value per stock option | € € 1.58 € 1.51  
Options, contractual term 10 years    
Option life, share options granted | Y 5 5 5
Stock options outstanding, beginning of year | Option 11,671,792 11,186,240 11,279,210
Granted | Option 4,852,997 1,377,780 1,793,449
Forfeited | Option (91,770) (179,259) (276,272)
Exercised | Option (99,317) (300,036) (337,746)
Expired | Option (267,397) (412,933) (1,272,401)
Stock options outstanding, end of the year | Option 16,066,305 11,671,792 11,186,240
Exercisable stock options, end of the year | Option 9,631,699 8,152,467 6,679,018
Average exercise price, beginning of year (in euro per share) € 3.38 € 3.1 € 3.66
Granted (in euro per share) 1.77 1.94 2.76
Forfeited (in euro per share) 1.62 1.61 4.62
Exercised (in euro per share) 0.63 0.79 1.07
Expired (in euro per share) 8.2 4.05 7.8
Average exercise price, end of the year (in euro per share) 2.56 3.38 3.1
Average exercise price of exercisable options, end of the year (in euro per share) 3.09 3.98 € 4.05
Options exercised during the year € 1.87 € 2.09  
Weighted average life 6 years 6 months 6 years 3 months 18 days  
Share options subject to non-market performance conditions      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Granted | Option 1,414,000    
Minimum | Share options      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Exercise price € 0.56 € 0.64  
Maximum | Share options      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Exercise price € 18.62 € 21.06