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Retirement benefit plan, Change in Net Defined Benefit Liability (Details) - CHF (SFr)
SFr in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Change in net defined benefit liability [Abstract]      
Net defined benefit liabilities, beginning of period SFr 7,098 SFr 7,464 SFr 7,485
Net pension cost through statement of income/(loss) 1,751 1,679 1,655
Remeasurement through other comprehensive income/(loss) (4,426) (956) (726)
Employer's contribution (1,210) (1,089) (950)
Net defined benefit liabilities, end of period SFr 3,213 SFr 7,098 SFr 7,464