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Share capital - At the market equity offering (Details) SFr / shares in Units, SFr in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
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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 |  |

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- Definition Amount of commissions paid for issuance ordinary shares. + References No definition available. + Details
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- Definition The amount of common shares authorized for sale in the open market. + References No definition available. + Details
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- Definition The increase (decrease) in equity shares resulting from treasury share transactions. + References No definition available. + Details
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- Definition The number of treasury shares issued or sold. + References No definition available. + Details
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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a_iii&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The cash inflow from the sale or issuing of treasury shares. [Refer: Sale or issue of treasury shares; Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_17&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of cost related to the issuance of shares. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d&doctype=Standard -URIDate 2021-03-24 + Details
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