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Share capital (Tables) | 12 Months Ended
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Dec. 31, 2022
Share capital |
Summary of capital structure | The table below summarizes the Company’s capital structure: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | ​ | In CHF thousands
​ |  | Common |  | Treasury |  | Share |  | Share |  | Treasury
​ | ​ | shares | ​ | shares | ​ | capital | ​ | premium | ​ | shares
December 31, 2020 |  | 76,936,738 |  | (5,000,000) |  | 1,538 |  | 346,890 |  | (100)
Proceeds from sale of treasury shares in public offerings, net of underwriting fees and transaction costs |  | — |  | 1,171,543 |  | — |  | 12,097 |  | 24
Asset purchase agreement, net of transaction costs |  | 7,106,840 |  | — |  | 142 |  | 54,328 |  | —
Conversion of note agreements, net of transaction costs | ​ | 3,026,634 |  | — |  | 61 |  | 16,683 |  | —
Issuance of shares – incentive plans, net of transaction costs | ​ | 237,258 |  | — |  | 5 |  | 1,253 |  | —
Issuance of shares to be held as treasury shares, net of transaction costs |  | 2,393,160 |  | (2,393,160) |  | 48 |  | — |  | (48)
December 31, 2021 |  | 89,700,630 |  | (6,221,617) |  | 1,794 |  | 431,251 |  | (124)
Proceeds from sale of treasury shares in public offerings, net of underwriting fees and transaction costs |  | — | ​ | 7,596 | ​ | — | ​ | (8) | ​ | 0
Issuance of shares – incentive plans, net of transaction costs |  | 133,755 | ​ | — | ​ | 3 | ​ | 80 | ​ | —
December 31, 2022 |  | 89,834,385 |  | (6,214,021) |  | 1,797 |  | 431,323 |  | (124)
​

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- Definition The disclosure of classes of share capital. [Refer: Share capital [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 79 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a&doctype=Standard -URIDate 2021-03-24 + Details
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