Related party transactions - Additional Information (Detail) - CHF (SFr) SFr in Thousands	Dec. 31, 2023	Dec. 31, 2022
Gem [member]
Disclosure of transactions between related parties [line items]
Non current financial liabilities at amortized cost	SFr 1,355	SFr 1,280

The amount of non-current financial liabilities measured at amortised cost. [Refer: Financial liabilities at amortised cost]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 8
-Subparagraph g
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_8_g&doctype=Standard
-URIDate 2023-03-23

Name:	ifrs-full_NoncurrentFinancialLiabilitiesAtAmortisedCost
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant