v3.26.1
Share-based compensation - Options (Details) - Share options
6 Months Ended 12 Months Ended
Jun. 30, 2026
Options
SFr / shares
Dec. 31, 2025
Options
SFr / shares
Number of options [Abstract]    
Outstanding at beginning of period | Options 5,518,564  
Forfeited during the period | Options (2,846)  
Expired during the period | Options (188,967)  
Exercised during the period | Options (21,508)  
Granted during the period | Options 609,347  
Outstanding at end of period | Options 5,914,590 5,518,564
Exercisable | Options 5,059,248  
Weighted average exercise price [Abstract]    
Weighted average exercise price, Outstanding at beginning of period | SFr / shares SFr 4.25  
Weighted average exercise price, Forfeited during the period | SFr / shares 2.6  
Weighted average exercise price, Expired during the period | SFr / shares 5.28  
Weighted average exercise price, Exercised during the period | SFr / shares 0.76  
Weighted average exercise price, Granted during the period | SFr / shares 2.3  
Weighted average exercise price, Outstanding at end of period | SFr / shares 3.54 SFr 4.25
Weighted average exercise price, Exercisable | SFr / shares SFr 3.75  
Weighted average remaining term (years) [Abstract]    
Weighted average remaining term (years), options outstanding 6 years 2 months 12 days 5 years 10 months 24 days
Weighted average remaining term (years), options exercisable 5 years 8 months 12 days