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Income taxes, Unrecognized Deductible Temporary Differences, Unused Tax Losses and Unused Tax Credits (Details) - CHF (SFr) SFr in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Unrecognized deductible temporary differences, unused tax losses and unused tax credits [Abstract] |  |  |
Deductible temporary differences for which no deferred tax asset is recognised | SFr 267,302 | SFr 204,250 | SFr 129,412
Tax losses split by expiry date [Abstract] |  |  |
Unrecorded tax loss carryforwards | 264,089 | 197,153 | 121,949
Increase (decrease) in tax losses available for offset against future taxable profits | 66,900 |  |
December 31, 2024 |  |  |
Tax losses split by expiry date [Abstract] |  |  |
Unrecorded tax loss carryforwards | 15,231 | 15,231 | 15,231
December 31, 2025 |  |  |
Tax losses split by expiry date [Abstract] |  |  |
Unrecorded tax loss carryforwards | 48,894 | 48,894 | 48,894
December 31, 2026 |  |  |
Tax losses split by expiry date [Abstract] |  |  |
Unrecorded tax loss carryforwards | 0 | 0 | 0
December 31, 2027 |  |  |
Tax losses split by expiry date [Abstract] |  |  |
Unrecorded tax loss carryforwards | 57,824 | 57,824 | 57,824
December 31, 2028 |  |  |
Tax losses split by expiry date [Abstract] |  |  |
Unrecorded tax loss carryforwards | 75,204 | 75,204 | 0
December 31, 2029 |  |  |
Tax losses split by expiry date [Abstract] |  |  |
Unrecorded tax loss carryforwards | 66,936 | 0 | 0
Tax Losses |  |  |
Unrecognized deductible temporary differences, unused tax losses and unused tax credits [Abstract] |  |  |
Deductible temporary differences for which no deferred tax asset is recognised | 264,089 | 197,152 | 121,948
Right of use assets and lease liabilities, net |  |  |
Unrecognized deductible temporary differences, unused tax losses and unused tax credits [Abstract] |  |  |
Deductible temporary differences for which no deferred tax asset is recognised | 0 | 0 | 0
Retirement benefit plan |  |  |
Unrecognized deductible temporary differences, unused tax losses and unused tax credits [Abstract] |  |  |
Deductible temporary differences for which no deferred tax asset is recognised | SFr 3,213 | SFr 7,098 | SFr 7,464

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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard -URIDate 2021-03-24 + Details
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