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Right-of-use assets, long-term financial assets and lease liabilities - Contractual undiscounted cash flows for lease obligations (Details)
SFr in Thousands
Dec. 31, 2022
CHF (SFr)
item
Dec. 31, 2021
CHF (SFr)
Contractual undiscounted cash flows for lease liabilities:    
Contractual undiscounted cash flows for lease liabilities SFr 3,055 SFr 3,101
Number of deposits in escrow accounts | item 2  
Escrow deposits SFr 400  
Less than one year    
Contractual undiscounted cash flows for lease liabilities:    
Contractual undiscounted cash flows for lease liabilities 638 638
1-3 years    
Contractual undiscounted cash flows for lease liabilities:    
Contractual undiscounted cash flows for lease liabilities 1,230 1,260
3-5 years    
Contractual undiscounted cash flows for lease liabilities:    
Contractual undiscounted cash flows for lease liabilities SFr 1,187 SFr 1,203