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Cash and cash equivalents and financial assets, Cash and cash equivalents (Details) SFr in Thousands | Dec. 31, 2022 CHF (SFr) SFr / € SFr / $ | Dec. 31, 2021 CHF (SFr) SFr / $ SFr / € | Dec. 31, 2020 CHF (SFr) | Dec. 31, 2019 CHF (SFr)
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Cash and cash equivalents [Abstract] |  |  |  |
Cash and cash equivalents | SFr 31,586 | SFr 82,216 | SFr 160,893 | SFr 193,587
Translation rate into CHF | SFr / $ | 0.933 | 0.923 |  |
CHF [Member] |  |  |  |
Cash and cash equivalents [Abstract] |  |  |  |
Cash and cash equivalents | SFr 24,418 | SFr 64,941 |  |
EUR [Member] |  |  |  |
Cash and cash equivalents [Abstract] |  |  |  |
Cash and cash equivalents | SFr 1,313 | SFr 2,253 |  |
Translation rate into CHF | SFr / € | 0.994 | 1.045 |  |
USD [Member] |  |  |  |
Cash and cash equivalents [Abstract] |  |  |  |
Cash and cash equivalents | SFr 5,855 | SFr 15,022 |  |
Translation rate into CHF | SFr / $ | 0.933 | 0.923 |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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