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Contract revenues - Morphomer Tau small molecule - 2018 license agreement with Eli Lilly and Company (Details) - CHF (SFr) SFr in Thousands | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Contract revenues |  |
Revenue from contracts with customers | SFr 16,232 | SFr 2,296
2018 License Agreement with Eli Lilly and Company |  |
Contract revenues |  |
Collaborative agreement, upfront payments received | 10,000 |
Milestone payment received | 1,000 |
Revenue from contracts with customers | 11,000 |
2018 License Agreement with Eli Lilly and Company | Maximum |  |
Contract revenues |  |
Collaborative agreement, potential amount receivable if certain conditions are fulfilled | SFr 1,700,000 |

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