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Intangible assets (Details) - CHF (SFr) SFr in Thousands | Jun. 30, 2026 | Dec. 31, 2025
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Disclosure of intangible assets material to entity [abstract] |  |
Intangible Assets | SFr 50,416 | SFr 50,416
Gross Carrying Amount |  |
Disclosure of intangible assets material to entity [abstract] |  |
Intangible Assets | 50,416 | 50,416
Acquired IPR&D Asset |  |
Disclosure of intangible assets material to entity [abstract] |  |
Intangible Assets | 50,416 | 50,416
Acquired IPR&D Asset | Gross Carrying Amount |  |
Disclosure of intangible assets material to entity [abstract] |  |
Intangible Assets | SFr 50,416 | SFr 50,416

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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2025-01-01 -Paragraph 118 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2025-en-r&anchor=para_118_e&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 263 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263_e&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 263 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263_e&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 54 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_c&doctype=Standard -URIDate 2025-03-27 + Details
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