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Financial instruments and risk management (Details)
SFr in Thousands
12 Months Ended
Dec. 31, 2017
CHF (SFr)
Bank
Dec. 31, 2016
CHF (SFr)
Dec. 31, 2015
CHF (SFr)
Financial assets and liabilities [Abstract]      
Financial assets SFr 125,295 SFr 152,727  
Financial liabilities 9,794 9,401  
Financial risks [Abstract]      
Gain (loss) in finance income/(expense), net (4,049) 3,443 SFr 1,598
Foreign Currency Exchange Risk [Member]      
Financial risks [Abstract]      
Gain (loss) in finance income/(expense), net SFr (4,200) 3,400 SFr 1,600
Percentage exchange rate strengthened 10.00%    
Percentage exchange rate weakened 10.00%    
Net loss for period decrease, result of foreign exchange rate increase SFr 2,100 10,900  
Net loss for period increase, result of foreign exchange rate decrease SFr 2,100 10,900  
Credit Risk [Member]      
Financial risks [Abstract]      
Number of banks holding cash and cash equivalents | Bank 1    
Liquidity Risk [Member]      
Financial risks [Abstract]      
Cash position rolling forecast period 18 months    
Long-Term Financing Obligation [Member]      
Financial assets and liabilities [Abstract]      
Financial liabilities SFr 395 0  
Trade and Other Payables [Member]      
Financial assets and liabilities [Abstract]      
Financial liabilities 1,092 4,035  
Accrued Expenses [Member]      
Financial assets and liabilities [Abstract]      
Financial liabilities 8,307 5,366  
Other Current Receivables [Member]      
Financial assets and liabilities [Abstract]      
Financial assets 918 517  
Cash and Cash Equivalents [Member]      
Financial assets and liabilities [Abstract]      
Financial assets SFr 124,377 SFr 152,210