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Share capital - Capital Structure (Details) - CHF (SFr) SFr / shares in Units, SFr in Thousands | 12 Months Ended
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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)

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