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Cash and cash equivalents and financial assets, Cash and cash equivalents (Details)
SFr in Thousands
Dec. 31, 2022
CHF (SFr)
SFr / €
SFr / $
Dec. 31, 2021
CHF (SFr)
SFr / $
SFr / €
Dec. 31, 2020
CHF (SFr)
Dec. 31, 2019
CHF (SFr)
Cash and cash equivalents [Abstract]        
Cash and cash equivalents SFr 31,586 SFr 82,216 SFr 160,893 SFr 193,587
Translation rate into CHF | SFr / $ 0.933 0.923    
CHF [Member]        
Cash and cash equivalents [Abstract]        
Cash and cash equivalents SFr 24,418 SFr 64,941    
EUR [Member]        
Cash and cash equivalents [Abstract]        
Cash and cash equivalents SFr 1,313 SFr 2,253    
Translation rate into CHF | SFr / € 0.994 1.045    
USD [Member]        
Cash and cash equivalents [Abstract]        
Cash and cash equivalents SFr 5,855 SFr 15,022    
Translation rate into CHF | SFr / $ 0.933 0.923