Intangible assets (Details) - CHF (SFr) SFr in Thousands |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| 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 |