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Intangible assets - Narrative (Details) - CHF (SFr)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]      
Intangible assets SFr 70,300,000 SFr 57,500,000 SFr 54,700,000
Research and development expense (8,200,000) (5,300,000)  
Impairment loss recognised in profit or loss, goodwill 0 0  
Goodwill expected to be deductible for tax purposes SFr 0    
SLIA 2019      
Disclosure of detailed information about intangible assets [line items]      
Discount rate applied to cash flow projections 9.30%    
Intangible assets under development      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets SFr 300,000 600,000  
Patents, licenses and other rights      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets SFr 54,200,000 41,900,000 44,700,000
Patents, licenses and other rights | Minimum      
Disclosure of detailed information about intangible assets [line items]      
Useful life measured as period of time, intangible assets other than goodwill 4 years    
Patents, licenses and other rights | Maximum      
Disclosure of detailed information about intangible assets [line items]      
Useful life measured as period of time, intangible assets other than goodwill 20 years    
Software      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets SFr 14,400,000 SFr 13,800,000 SFr 8,200,000
Useful life measured as period of time, intangible assets other than goodwill 4 years    
IT development cost capitalized      
Disclosure of detailed information about intangible assets [line items]      
Useful life measured as period of time, intangible assets other than goodwill 4 years