v3.25.2
Share-based compensation - Options (Details) - Share options
6 Months Ended 12 Months Ended
Jun. 30, 2025
Options
SFr / shares
Dec. 31, 2024
Options
SFr / shares
Dec. 31, 2023
Options
SFr / shares
Number of options [Abstract]      
Outstanding at beginning of period | Options 5,010,827 4,949,177  
Forfeited during the period | Options (53,954) (135,118)  
Expired during the period | Options (51,448) (205,634)  
Exercised during the period | Options (15,000) (4,278)  
Granted during the period | Options 369,231 406,680  
Outstanding at end of period | Options 5,259,656 5,010,827 4,949,177
Exercisable | Options 4,490,957 4,097,932  
Weighted average exercise price [Abstract]      
Weighted average exercise price, Outstanding at beginning of period | SFr / shares SFr 4.5 SFr 4.11  
Weighted average exercise price, Forfeited during the period | SFr / shares 3.42 3.28  
Weighted average exercise price, Expired during the period | SFr / shares 1.81 5.41  
Weighted average exercise price, Exercised during the period | SFr / shares 0.15 3.11  
Weighted average exercise price, Granted during the period | SFr / shares 2.63 3.4  
Weighted average exercise price, Outstanding at end of period | SFr / shares 4.42 4.5 SFr 4.11
Weighted average exercise price, Exercisable | SFr / shares SFr 4.69 SFr 4.79  
Weighted average remaining term (years) [Abstract]      
Weighted average remaining term (years), options outstanding 6 years 3 months 18 days 6 years 3 months 18 days 7 years 2 months 12 days
Weighted average remaining term (years), options exercisable 6 years 5 years 10 months 24 days