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Right-of-use assets, long-term financial assets and lease liabilities (Details) - CHF (SFr)
SFr in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Right-of-use assets and lease liabilities:    
Additions and remeasurements SFr 460 SFr 1,215
Right-of-use of leased assets:    
Balance, beginning of period 2,914 2,223
Depreciation (566) (509)
Dispositions   (15)
Balance, end of period 2,808 2,914
Buildings    
Right-of-use assets and lease liabilities:    
Additions and remeasurements SFr 460 SFr 1,144
Weighted average incremental borrowing rate 3.50% 2.50%
Right-of-use of leased assets:    
Balance, beginning of period SFr 2,776 SFr 2,106
Depreciation (528) (474)
Balance, end of period 2,708 2,776
Office Equipment    
Right-of-use assets and lease liabilities:    
Additions and remeasurements SFr 0 SFr 71
Weighted average incremental borrowing rate 5.30% 5.30%
Right-of-use of leased assets:    
Balance, beginning of period SFr 98 SFr 63
Depreciation (24) (21)
Dispositions   (15)
Balance, end of period 74 98
IT Equipment    
Right-of-use assets and lease liabilities:    
Additions and remeasurements SFr 0 SFr 0
Weighted average incremental borrowing rate 2.60% 2.60%
Right-of-use of leased assets:    
Balance, beginning of period SFr 40 SFr 54
Depreciation (14) (14)
Balance, end of period SFr 26 SFr 40