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Property, plant and equipment - Narrative (Details) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment SFr 93.6 SFr 77.2 SFr 34.4
Construction in progress      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment SFr 2.4 6.4  
Construction in progress | Minimum      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful life measured as period of time, property, plant and equipment 5 years    
Construction in progress | Maximum      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful life measured as period of time, property, plant and equipment 8 years    
Trade tools      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment SFr 6.1 5.3 3.8
Useful life measured as period of time, property, plant and equipment 3 years    
Production tools      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment SFr 9.4 7.5 6.3
Useful life measured as period of time, property, plant and equipment 2 years    
Furniture and fixtures      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment SFr 16.5 12.1 2.6
Furniture and fixtures | Minimum      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful life measured as period of time, property, plant and equipment 5 years    
Furniture and fixtures | Maximum      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful life measured as period of time, property, plant and equipment 8 years    
Other      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment SFr 11.9 SFr 7.6 SFr 2.6
Other | Minimum      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful life measured as period of time, property, plant and equipment 3 years    
Other | Maximum      
Disclosure of detailed information about property, plant and equipment [line items]      
Useful life measured as period of time, property, plant and equipment 8 years