v3.25.4
Share-based compensation - Options (Details)
 12 Months Ended
Dec. 31, 2025
Options
SFr / shares
Dec. 31, 2025
Options
$ / shares
SFr / shares
Dec. 31, 2024
Options
SFr / shares
Dec. 31, 2024
Options
$ / shares
SFr / shares
Dec. 31, 2023
Options
SFr / shares
Dec. 31, 2023
Options
$ / shares
SFr / shares
Dec. 31, 2022
Options
SFr / shares
Number of options [Abstract]              
Outstanding at end of period 5,518,564 5,518,564          
Weighted average exercise price [Abstract]              
Weighted average exercise price, Granted during the period | (per share) SFr 2.09 $ 2.4 SFr 3.4 $ 3.99 SFr 1.75 $ 2.08  
Share options              
Number of options [Abstract]              
Outstanding at beginning of period 5,010,827 5,010,827 4,949,177 4,949,177 4,261,017 4,261,017  
Forfeited during the period (69,422) (69,422) (135,118) (135,118) (824,084) (824,084)  
Expired during the period (89,722) (89,722) (205,634) (205,634)      
Exercised during the period (41,140) (41,140) (4,278) (4,278) (42,037) (42,037)  
Granted during the period 708,021 708,021 406,680 406,680 1,554,281 1,554,281  
Outstanding at end of period 5,518,564 5,518,564 5,010,827 5,010,827 4,949,177 4,949,177 4,261,017
Exercisable 4,815,928 4,815,928 4,097,932 4,097,932 3,022,345 3,022,345  
Weighted average exercise price [Abstract]              
Weighted average exercise price, Outstanding at beginning of period | SFr / shares SFr 4.5   SFr 4.11   SFr 5.65    
Weighted average exercise price, Forfeited during the period | SFr / shares 3.46   3.28   5.34    
Weighted average exercise price, Expired during the period | SFr / shares 3.77   5.41        
Weighted average exercise price, Exercised during the period | SFr / shares 0.23   3.11   1.52    
Weighted average exercise price, Granted during the period | SFr / shares 2.09   3.4   1.75    
Weighted average exercise price, Outstanding at end of period | SFr / shares 4.25   4.5   4.11   SFr 5.65
Weighted average exercise price, Exercisable | SFr / shares SFr 4.54 $ 4.54 SFr 4.79 $ 4.79 SFr 4.88 $ 4.88  
Weighted average remaining term (years) [Abstract]              
Weighted average remaining term (years), options outstanding 5 years 10 months 24 days 5 years 10 months 24 days 6 years 3 months 18 days 6 years 3 months 18 days 7 years 2 months 12 days 7 years 2 months 12 days 7 years 7 months 6 days
Weighted average remaining term (years), options exercisable 5 years 6 months 5 years 6 months 5 years 10 months 24 days 5 years 10 months 24 days 6 years 4 months 24 days 6 years 4 months 24 days