XML 130 R73.htm IDEA: XBRL DOCUMENT v3.22.4
Share capital - At the market equity offering (Details)
SFr / shares in Units, SFr in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2021
SFr / shares
shares
Sep. 30, 2020
CHF (SFr)
SFr / shares
shares
Sep. 30, 2020
USD ($)
shares
Dec. 31, 2022
CHF (SFr)
SFr / shares
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
CHF (SFr)
Dec. 31, 2020
CHF (SFr)
At the Market Equity Offering [Abstract]              
Nominal value per share (in CHF per share) | SFr / shares       SFr 0.02      
Issuance costs | SFr       SFr 0   SFr 776 SFr 0
At the Market Equity Offering [Member]              
At the Market Equity Offering [Abstract]              
Issuance of shares to be held as treasury shares | shares 2,393,160 5,000,000 5,000,000        
Nominal value per share (in CHF per share) | SFr / shares SFr 0.02 SFr 0.02          
Shares authorized for sale   SFr 74,600 $ 80.0        
Issuance costs | SFr       SFr 0   SFr 0 SFr 500
New Sales Agreement [Member]              
At the Market Equity Offering [Abstract]              
Number of treasury share issued (in shares) | shares       1,179,139 1,179,139    
Proceeds from issuance of treasury shares, net of underwriting fees and transaction costs       SFr 12,100 $ 13.3    
Commissions paid       SFr 400 $ 0.4