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Share-based compensation, Non-vested Share Awards (Details) | 12 Months Ended | 74 Months Ended
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Dec. 31, 2022 CHF (SFr) EquityInstruments | Dec. 31, 2021 CHF (SFr) EquityInstruments | Dec. 31, 2020 CHF (SFr) EquityInstruments | Dec. 31, 2022 CHF (SFr) EquityInstruments
Weighted Average grant date fair value [Abstract] |  |  |  |
Expense charged against the income statement | SFr | SFr 3,300,000 | SFr 4,100,000 | SFr 4,100,000 |
Directors [Member] |  |  |  |
Share-based payment arrangement [Abstract] |  |  |  |
Vesting conditions | 1 year |  |  |
Non-vested Share Awards [Member] |  |  |  |
Share-based payment arrangement [Abstract] |  |  |  |
Number of non-vested share awards granted (in shares) | 239,194 |  | 0 |
Number of non-vested shares [Abstract] |  |  |  |
Non-vested at beginning of period (in shares) | 797 | 19,494 | 42,763 |
Forfeited during the year (in shares) |  |  | (11,828) |
Expired during the year (in shares) |  |  | (7,804) |
Exercised during the year (in shares) |  | (2,471) | (84,638) |
Granted during the year (in shares) | 239,194 |  | 0 |
Vested during the year | (23,505) | (18,697) | (23,269) |
Non-vested at end of period (in shares) | 216,486 | 797 | 19,494 | 216,486
Vested and exercisable (in shares) | 89,020 | 65,515 | 49,289 | 89,020
Weighted Average grant date fair value [Abstract] |  |  |  |
Weighted average grant date fair value, non-vested at beginning of period | SFr | SFr 9.41 | SFr 9.51 | SFr 9.52 |
Weighted average grant date fair value, forfeited during the year | SFr |  |  | 9.47 |
Weighted average grant date fair value, expired during the year | SFr |  |  | 9.52 |
Weighted average grant date fair value, exercised during the year | SFr |  | 9.46 | 9.51 |
Weighted average grant date fair value, granted during the year | SFr | 3.06 |  | 0 |
Weighted average grant date fair value, vested during the year | SFr | 3.28 | 9.52 | 9.52 |
Weighted average grant date fair value, vested and exercisable | SFr | 7.84 | 9.48 | 9.47 | SFr 7.84
Weighted average grant date fair value, non-vested at end of period | SFr | 3.06 | 9.41 | 9.51 | 3.06
Restricted Stock Units |  |  |  |
Weighted Average grant date fair value [Abstract] |  |  |  |
Weighted average grant date fair value, non-vested at beginning of period | SFr | 9.41 | 9.51 |  |
Weighted average grant date fair value, non-vested at end of period | SFr | SFr 3.06 | SFr 9.41 | SFr 9.51 | SFr 3.06
Restricted Stock Units | Directors [Member] |  |  |  |
Share-based payment arrangement [Abstract] |  |  |  |
Number of non-vested share awards granted (in shares) |  |  |  | 159,025
Contractual life of options | 10 years |  |  |
Number of non-vested shares [Abstract] |  |  |  |
Granted during the year (in shares) |  |  |  | 159,025
Restricted Stock Units | Executives [Member] |  |  |  |
Share-based payment arrangement [Abstract] |  |  |  |
Number of non-vested share awards granted (in shares) |  |  |  | 274,872
Contractual life of options | 10 years |  |  |
Number of non-vested shares [Abstract] |  |  |  |
Granted during the year (in shares) |  |  |  | 274,872
Restricted Stock Units, first vesting conditions | Executives [Member] |  |  |  |
Share-based payment arrangement [Abstract] |  |  |  |
Vesting conditions | 3 years |  |  |
Restricted Stock Units, second vesting conditions | Executives [Member] |  |  |  |
Share-based payment arrangement [Abstract] |  |  |  |
Vesting conditions | 4 years |  |  |

X
- Definition The maximum term of other equity instruments (ie other than share options) granted for a type of share-based payment arrangement that existed at any time during the period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The number of other equity instruments (ie other than share options) exercised in a share-based payment arrangement. + References No definition available. + Details
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- Definition For vesting requirements for a type of share-based payment arrangement that existed at any time during the period, this element represents the period which an employees' right to exercise an award is no longer contingent on satisfaction of a service condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions] + 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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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
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