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Income and Expenses - Schedule of Total Tax (Expense) (Details) - CHF (SFr)
SFr in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Analysis of income and expense [abstract]      
Current income tax (expense) / benefit SFr (90) SFr (22) SFr (1)
Deferred tax (expense) / income 35 (5) (82)
Total tax (expense) / income reported in the income statement SFr (55) SFr (27) SFr (83)