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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)
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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- References

No definition available.

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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
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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

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