Contract revenues, Contract Revenue Attributable to Licensing Arrangements (Details) - CHF (SFr) SFr in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Contract Revenue [Abstract]
Total contract revenues	SFr 3,935	SFr 0	SFr 15,431
Lilly [Member]
Contract Revenue [Abstract]
Total contract revenues	0	SFr 0	14,348
Percentage of contract revenues		93.00%
Janssen
Contract Revenue [Abstract]
Total contract revenues	0	SFr 0	1,083
Life Molecular Imaging [Member]
Contract Revenue [Abstract]
Total contract revenues	SFr 3,935	SFr 0	SFr 0
Percentage of contract revenues	100.00%

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2021-01-01
-Paragraph 113
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_113_a&doctype=Standard
-URIDate 2021-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2021-01-01
-Paragraph 114
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2021-en-r&anchor=para_114&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_RevenueFromContractsWithCustomers
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration