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Share capital - Capital Structure (Details) - CHF (SFr)
SFr / shares in Units, SFr in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Treasury shares      
Treasury shares outstanding at beginning of period (6,221,617)    
Treasury shares outstanding at end of period (6,214,021) (6,221,617)  
Changes in equity      
Balance, beginning of period SFr 231,979 SFr 215,478 SFr 272,442
Proceeds from sale of treasury shares in public offerings, net of underwriting fees and transaction costs (8) 12,121  
Conversion of note agreements, net of transaction costs   16,744  
Issuance of shares to be held as treasury shares, net of transaction costs   0 0
Balance, end of period SFr 168,991 SFr 231,979 SFr 215,478
Nominal value per share (in CHF per share) SFr 0.02    
Common Shares      
Common shares      
Common shares outstanding at beginning of period 89,700,630 76,936,738  
Asset purchase agreement, net of transaction costs (in shares)   7,106,840  
Conversion of note agreement, net of transaction costs (in shares)   3,026,634  
Issuance of shares - incentive plans, net of transaction costs (in shares) 133,755 237,258  
Issuance of shares to be held as treasury shares, net of transaction costs (in shares)   2,393,160  
Common shares outstanding at end of period 89,834,385 89,700,630 76,936,738
Treasury shares      
Issuance of shares to be held as treasury shares, net of transaction costs (in shares)   2,393,160  
Treasury shares      
Common shares      
Issuance of shares to be held as treasury shares, net of transaction costs (in shares)   2,393,160  
Treasury shares      
Treasury shares outstanding at beginning of period (6,221,617) (5,000,000)  
Issuance of shares to be held as treasury shares, net of transaction costs (in shares)   2,393,160  
Proceeds from sale of treasury shares in public offerings, net of underwriting fees and transaction costs (in shares) 7,596 1,171,543  
Treasury shares outstanding at end of period (6,214,021) (6,221,617) (5,000,000)
Share capital      
Changes in equity      
Balance, beginning of period SFr 1,794 SFr 1,538 SFr 1,437
Asset purchase agreement, net of transaction costs   142  
Conversion of note agreements, net of transaction costs   61  
Issuance of shares - incentive plans, net of transaction costs 3 5  
Issuance of shares to be held as treasury shares, net of transaction costs   48 100
Balance, end of period 1,797 1,794 1,538
Share premium      
Changes in equity      
Balance, beginning of period 431,251 346,890 346,526
Proceeds from sale of treasury shares in public offerings, net of underwriting fees and transaction costs (8) 12,097  
Asset purchase agreement, net of transaction costs   54,328  
Conversion of note agreements, net of transaction costs   16,683  
Issuance of shares - incentive plans, net of transaction costs 80 1,253  
Issuance of shares to be held as treasury shares, net of transaction costs   0 0
Balance, end of period 431,323 431,251 346,890
Treasury shares      
Changes in equity      
Balance, beginning of period (124) (100) 0
Proceeds from sale of treasury shares in public offerings, net of underwriting fees and transaction costs 0 24  
Issuance of shares to be held as treasury shares, net of transaction costs   (48) (100)
Balance, end of period SFr (124) SFr (124) SFr (100)