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Share capital - Convertible note agreement (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CHF (SFr)
agreement
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CHF (SFr)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
CHF (SFr)
Dec. 31, 2022
USD ($)
agreement
Convertible Note Agreement [Abstract]            
Net proceeds | SFr SFr 0   SFr 23,463,000   SFr 0  
Convertible note agreements            
Convertible Note Agreement [Abstract]            
Number of separate convertible note agreements | agreement 2         2
Aggregate principal amount of each convertible note SFr 11,700,000         $ 12.5
Proceeds from conversion of convertible debt, per individual note     SFr 11,700,000 $ 12.5    
Number of shares issued through conversion of convertible notes     3,026,634 3,026,634    
Outstanding equity or cash consideration due under convertible note agreements | SFr     SFr 0      
Convertible note agreements | Athos Service GmbH [Member]            
Convertible Note Agreement [Abstract]            
Number of shares issued through conversion of convertible notes     1,513,317 1,513,317    
Convertible note agreements | First Capital Partner GmbH [Member]            
Convertible Note Agreement [Abstract]            
Number of shares issued through conversion of convertible notes     1,513,317 1,513,317    
Convertible note agreements | Top of Range [Member] | If notes are converted            
Convertible Note Agreement [Abstract]            
Net proceeds SFr 23,500,000 $ 25.0