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Intangible assets (Details)
SFr in Thousands
Dec. 31, 2022
CHF (SFr)
Dec. 31, 2021
CHF (SFr)
Disclosure of intangible assets material to entity [abstract]    
Intangible Assets SFr 50,416 SFr 50,416
Gross Carrying Amount    
Disclosure of intangible assets material to entity [abstract]    
Intangible Assets 50,416 50,416
Accumulated Amortization    
Disclosure of intangible assets material to entity [abstract]    
Intangible Assets 0 0
Acquired IPR&D Asset    
Disclosure of intangible assets material to entity [abstract]    
Intangible Assets SFr 50,416 SFr 50,416
Acquired IPR&D Asset | Discount rate, measurement input    
Disclosure of intangible assets material to entity [abstract]    
Discount rate 0.17 0.15
Acquired IPR&D Asset | Gross Carrying Amount    
Disclosure of intangible assets material to entity [abstract]    
Intangible Assets SFr 50,416 SFr 50,416
Acquired IPR&D Asset | Accumulated Amortization    
Disclosure of intangible assets material to entity [abstract]    
Intangible Assets SFr 0 SFr 0