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Retirement benefit plan, Change in Net Defined Benefit Liability (Details) - CHF (SFr) SFr in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in net defined benefit liability [Abstract]
Net defined benefit liabilities, beginning of period	SFr 7,098	SFr 7,464	SFr 7,485
Net pension cost through statement of income/(loss)	1,751	1,679	1,655
Remeasurement through other comprehensive income/(loss)	(4,426)	(956)	(726)
Employer's contribution	(1,210)	(1,089)	(950)
Net defined benefit liabilities, end of period	SFr 3,213	SFr 7,098	SFr 7,464

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- References

No definition available.

+ Details

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- Definition

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 141
-Subparagraph f
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-URIDate 2021-03-24

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 141
-Subparagraph c
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-URIDate 2021-03-24

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from expense (income) included in profit or loss. [Refer: Net defined benefit liability (asset); Profit (loss)] [Contrast: Post-employment benefit expense in profit or loss, defined benefit plans]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 141
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141&doctype=Standard
-URIDate 2021-03-24

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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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