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Financial instruments and risk management (Details)
SFr in Thousands
12 Months Ended
Dec. 31, 2021
CHF (SFr)
Institution
Dec. 31, 2020
CHF (SFr)
Dec. 31, 2019
CHF (SFr)
Financial assets and liabilities [Abstract]      
Financial assets SFr 201,921 SFr 228,779  
Financial liabilities 21,649 15,492  
Financial risks [Abstract]      
Loss in finance results, net 113 (555) SFr (2,013)
Foreign Currency Exchange Risk [Member]      
Financial risks [Abstract]      
Loss in finance results, net SFr (100) (700) SFr (800)
Percentage exchange rate strengthened 10.00%    
Percentage exchange rate weakened 10.00%    
Net loss for period decrease, result of foreign exchange rate increase SFr 1,700 800  
Credit Risk [Member]      
Financial risks [Abstract]      
Number of financial institutions holding cash and cash equivalents and short-term financial assets | Institution 5    
Liquidity Risk [Member]      
Financial risks [Abstract]      
Cash position rolling forecast period 18 months    
Interest Rate [member]      
Financial risks [Abstract]      
Percentage of increase in interest rates 10.00%    
Percentage of decrease in interest rates 10.00%    
Interest Rate [member] | Top of Range [Member]      
Financial risks [Abstract]      
Net loss for period increase, due to increase in interest rate SFr 200    
Net loss for period decrease, due to decrease in interest rate 200    
Long-term Lease Liabilities [Member]      
Financial assets and liabilities [Abstract]      
Financial liabilities 2,340 1,780  
Trade and Other Payables [Member]      
Financial assets and liabilities [Abstract]      
Financial liabilities SFr 2,003 2,184  
Trade and Other Payables [Member] | Liquidity Risk [Member] | Bottom of Range [Member]      
Financial risks [Abstract]      
Expected debt obligation payoff period 12 months    
Accrued Expenses [Member]      
Financial assets and liabilities [Abstract]      
Financial liabilities SFr 16,736 11,085  
Short-term Lease Liabilities [Member]      
Financial assets and liabilities [Abstract]      
Financial liabilities 570 443  
Right-of-use Assets [Member]      
Financial assets and liabilities [Abstract]      
Financial assets 2,914 2,223  
Long-term Financial Assets [Member]      
Financial assets and liabilities [Abstract]      
Financial assets 363 334  
Other Current Receivables [Member]      
Financial assets and liabilities [Abstract]      
Financial assets 428 329  
Short-term Financial Assets [Member]      
Financial assets and liabilities [Abstract]      
Financial assets 116,000 65,000  
Cash and Cash Equivalents [Member]      
Financial assets and liabilities [Abstract]      
Financial assets SFr 82,216 SFr 160,893