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Financial instruments and risk management (Details)
SFr in Thousands
12 Months Ended
Dec. 31, 2022
CHF (SFr)
Institution
Dec. 31, 2021
CHF (SFr)
Dec. 31, 2020
CHF (SFr)
Financial assets and liabilities [Abstract]      
Financial assets SFr 126,147 SFr 201,921  
Financial liabilities 13,147 21,649  
Financial risks [Abstract]      
Foreign exchange gains (losses) 393 113 SFr (555)
Long-term lease liabilities      
Financial assets and liabilities [Abstract]      
Financial liabilities 2,253 2,340  
Trade and other payables      
Financial assets and liabilities [Abstract]      
Financial liabilities 929 2,003  
Accrued expenses      
Financial assets and liabilities [Abstract]      
Financial liabilities 9,417 16,736  
Short-term lease liabilities      
Financial assets and liabilities [Abstract]      
Financial liabilities 548 570  
Right-of-use assets      
Financial assets and liabilities [Abstract]      
Financial assets 2,808 2,914  
Long-term financial assets      
Financial assets and liabilities [Abstract]      
Financial assets 361 363  
Other current receivables [Member]      
Financial assets and liabilities [Abstract]      
Financial assets 392 428  
Short-term financial assets      
Financial assets and liabilities [Abstract]      
Financial assets 91,000 116,000  
Cash and cash equivalents      
Financial assets and liabilities [Abstract]      
Financial assets 31,586 82,216  
Foreign Currency Exchange Risk [Member]      
Financial risks [Abstract]      
Foreign exchange gains (losses) SFr 500 (100) SFr (700)
Percentage of reasonably possible strengthening or weakening of reporting currency against other relevant currencies 10.00%    
Increase (decrease) in profit (loss) resulting from reasonably possible strengthening or weakening of reporting currency against other relevant currencies SFr 700 SFr 1,700  
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    
Liquidity Risk [Member] | Trade and other payables      
Financial assets and liabilities [Abstract]      
Financial liabilities SFr 900    
Liquidity Risk [Member] | Accrued expenses      
Financial assets and liabilities [Abstract]      
Financial liabilities 9,400    
Interest Rate [member]      
Financial risks [Abstract]      
Cash and cash equivalents subject to negative interest rates SFr 0    
Percentage of reasonably possible increase or decrease in interest rates 10.00%    
Interest Rate [member] | Top of Range [Member]      
Financial risks [Abstract]      
Increase (decrease) in profit (loss) resulting from reasonably possible increase or decrease in interest rates SFr 200