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Retirement benefit plan, Actuarial Assumptions and Sensitivity Analysis (Details) - CHF (SFr) SFr in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Actuarial assumptions [Abstract] |  |  |
Discount rate | 2.25% | 0.30% | 0.20%
Rate of future increase in compensations | 1.75% | 1.75% | 1.75%
Rate of future increase in current pensions | 0.00% | 0.00% | 0.00%
Interest rate on retirement savings capital | 2.25% | 0.75% | 0.50%
+0.5% Increase [Member] |  |  |
Sensitivity analysis [Abstract] |  |  |
Percentage increase in actuarial assumption | 0.50% | 0.50% |
-0.5% Decrease [Member] |  |  |
Sensitivity analysis [Abstract] |  |  |
Percentage decrease in actuarial assumption | 0.50% | 0.50% |
Discount rate | +0.5% Increase [Member] |  |  |
Sensitivity analysis [Abstract] |  |  |
Percentage increase in actuarial assumption | 0.50% | 0.50% |
Potential defined benefit obligation | SFr 30,201 | SFr 31,190 |
Decrease/(increase) from actual defined benefit obligation | SFr (2,209) | SFr (2,699) |
Discount rate | -0.5% Decrease [Member] |  |  |
Sensitivity analysis [Abstract] |  |  |
Percentage decrease in actuarial assumption | 0.50% | 0.50% |
Potential defined benefit obligation | SFr 34,916 | SFr 37,006 |
Decrease/(increase) from actual defined benefit obligation | SFr 2,506 | SFr 3,117 |
Future salary increase | +0.5% Increase [Member] |  |  |
Sensitivity analysis [Abstract] |  |  |
Percentage increase in actuarial assumption | 0.50% | 0.50% |
Potential defined benefit obligation | SFr 32,940 | SFr 34,578 |
Decrease/(increase) from actual defined benefit obligation | SFr 530 | SFr 689 |
Future salary increase | -0.5% Decrease [Member] |  |  |
Sensitivity analysis [Abstract] |  |  |
Percentage decrease in actuarial assumption | 0.50% | 0.50% |
Potential defined benefit obligation | SFr 31,841 | SFr 33,176 |
Decrease/(increase) from actual defined benefit obligation | SFr (569) | SFr (713) |
Future pension cost | +0.5% Increase [Member] |  |  |
Sensitivity analysis [Abstract] |  |  |
Percentage increase in actuarial assumption | 0.50% | 0.50% |
Potential defined benefit obligation | SFr 33,601 | SFr 35,497 |
Decrease/(increase) from actual defined benefit obligation | SFr 1,191 | SFr 1,608 |
Future pension cost | -0.5% Decrease [Member] |  |  |
Sensitivity analysis [Abstract] |  |  |
Percentage decrease in actuarial assumption | 0.50% | 0.50% |
Potential defined benefit obligation | SFr 31,322 | SFr 32,435 |
Decrease/(increase) from actual defined benefit obligation | SFr (1,088) | SFr (1,454) |
Interest rate on savings capital | +0.5% Increase [Member] |  |  |
Sensitivity analysis [Abstract] |  |  |
Percentage increase in actuarial assumption | 0.50% | 0.50% |
Potential defined benefit obligation | SFr 33,322 | SFr 34,822 |
Decrease/(increase) from actual defined benefit obligation | SFr 912 | SFr 933 |
Interest rate on savings capital | -0.5% Decrease [Member] |  |  |
Sensitivity analysis [Abstract] |  |  |
Percentage decrease in actuarial assumption | 0.50% | 0.50% |
Potential defined benefit obligation | SFr 31,545 | SFr 33,007 |
Decrease/(increase) from actual defined benefit obligation | SFr (865) | SFr (882) |

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The expected rate of increases in pension that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + Details
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