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Contract revenues and other operating income (Details) - CHF (SFr) SFr in Thousands | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Contract revenue | SFr 16,232 | SFr 2,296
Takeda |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Contract revenue | 5,232 | SFr 2,296
Lilly |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Contract revenue | SFr 11,000 |

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