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Retirement benefit plan, Actuarial Assumptions and Sensitivity Analysis (Details) - Defined Benefit Plan [Member] - CHF (SFr)
SFr in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Actuarial assumptions [Abstract]        
Discount rate 0.30% 0.20% 0.20%  
Rate of future increase in compensations 1.75% 1.75% 1.75%  
Rate of future increase in current pensions 0.00% 0.00% 0.00%  
Interest rate on retirement savings capital 0.75% 0.50% 0.50%  
Mortality and disability rates BVG 2020-CMI BVG 2020-CMI BVG 2015-CMI  
Sensitivity analysis [Abstract]        
Potential defined benefit obligation SFr 7,098 SFr 7,464 SFr 7,485 SFr 5,665
+0.5% Increase [Member]        
Sensitivity analysis [Abstract]        
Percentage increase in actuarial assumption 0.50% 0.50%    
-0.5% Decrease [Member]        
Sensitivity analysis [Abstract]        
Percentage decrease in actuarial assumption 0.50% 0.50%    
Discount Rate [Member] | +0.5% Increase [Member]        
Sensitivity analysis [Abstract]        
Potential defined benefit obligation SFr 31,190 SFr 27,740    
Decrease/(increase) from actual defined benefit obligation 2,699 2,473    
Discount Rate [Member] | -0.5% Decrease [Member]        
Sensitivity analysis [Abstract]        
Potential defined benefit obligation 37,006 33,080    
Decrease/(increase) from actual defined benefit obligation (3,117) (2,867)    
Future Salary Increase [Member] | +0.5% Increase [Member]        
Sensitivity analysis [Abstract]        
Potential defined benefit obligation 34,578 30,912    
Decrease/(increase) from actual defined benefit obligation (689) (699)    
Future Salary Increase [Member] | -0.5% Decrease [Member]        
Sensitivity analysis [Abstract]        
Potential defined benefit obligation 33,176 29,519    
Decrease/(increase) from actual defined benefit obligation 713 694    
Future Pension Cost [Member] | +0.5% Increase [Member]        
Sensitivity analysis [Abstract]        
Potential defined benefit obligation 35,497 31,652    
Decrease/(increase) from actual defined benefit obligation (1,608) (1,439)    
Future Pension Cost [Member] | -0.5% Decrease [Member]        
Sensitivity analysis [Abstract]        
Potential defined benefit obligation 32,435 28,916    
Decrease/(increase) from actual defined benefit obligation 1,454 1,297    
Interest Rate on Savings Capital [Member] | +0.5% Increase [Member]        
Sensitivity analysis [Abstract]        
Potential defined benefit obligation 34,822 31,070    
Decrease/(increase) from actual defined benefit obligation (933) (857)    
Interest Rate on Savings Capital [Member] | -0.5% Decrease [Member]        
Sensitivity analysis [Abstract]        
Potential defined benefit obligation 33,007 29,405    
Decrease/(increase) from actual defined benefit obligation SFr 882 SFr 808