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Share-based compensation, Weighted Average Exercise Prices (Details)
 12 Months Ended
Dec. 31, 2022
Options
SFr / shares
Dec. 31, 2022
Options
$ / shares
SFr / shares
Dec. 31, 2021
Options
SFr / shares
Dec. 31, 2021
Options
SFr / shares
$ / shares
Dec. 31, 2020
Options
SFr / shares
Dec. 31, 2020
Options
$ / shares
SFr / shares
Dec. 31, 2019
Options
SFr / shares
Number of options [Abstract]              
Outstanding at beginning of period (in shares) 3,585,689 3,585,689 2,900,667 2,900,667 1,981,629 1,981,629  
Forfeited during the year (in shares) (304,738) (304,738) (207,331) (207,331) (53,591) (53,591)  
Expired during the year (in shares)         (26,729) (26,729)  
Exercised during the year (in shares) (110,250) (110,250) (218,561) (218,561) (73,669) (73,669)  
Granted during the year (in shares) 1,090,316 1,090,316 1,110,914 1,110,914 1,073,027 1,073,027  
Outstanding at end of period (in shares) 4,261,017 4,261,017 3,585,689 3,585,689 2,900,667 2,900,667 1,981,629
Exercisable (in shares) 2,345,648 2,345,648 1,613,242 1,613,242 1,099,015 1,099,015  
Weighted average exercise price [Abstract]              
Outstanding at beginning of period (in CHF per share) | SFr / shares SFr 6.21   SFr 5.90   SFr 5.93    
Forfeited during the year (in CHF per share) | SFr / shares 6.32   6.13   6.03    
Expired during the year (in CHF per share) | SFr / shares         4.38    
Exercised during the year (in CHF per share) | SFr / shares 0.15   4.97   2.00    
Granted during the year (in CHF per share) | (per share) 3.18 $ 3.44 6.34 $ 6.95 6.29 $ 7.11  
Outstanding at end of period (in CHF per share) | SFr / shares 5.65   6.21   5.90   SFr 5.93
Exercisable (in CHF per share) | SFr / shares SFr 6.41 $ 6.41 SFr 6.13 $ 6.13 SFr 5.49 $ 5.49  
Weighted average remaining term (years) [Abstract]              
Weighted average remaining term (years), options outstanding 7 years 7 months 6 days 7 years 7 months 6 days 7 years 9 months 18 days 7 years 9 months 18 days 8 years 2 months 12 days 8 years 2 months 12 days 8 years 3 months 18 days
Weighted average remaining term (years), options exercisable 6 years 7 months 6 days 6 years 7 months 6 days 6 years 9 months 18 days 6 years 9 months 18 days 7 years 7 years