Financial risk management - Disclosure of Maximum Credit Risk Exposure (Details) - Credit risk - CHF (SFr) SFr in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of credit risk exposure [line items] | ||
| Maximum exposure to credit risk | SFr 93,382 | SFr 150,001 |
| Cash and cash equivalents | ||
| Disclosure of credit risk exposure [line items] | ||
| Maximum exposure to credit risk | 82,653 | 63,874 |
| Trade receivables | ||
| Disclosure of credit risk exposure [line items] | ||
| Maximum exposure to credit risk | 253 | 286 |
| Accrued income | ||
| Disclosure of credit risk exposure [line items] | ||
| Maximum exposure to credit risk | 71 | 276 |
| Short-term time deposits | ||
| Disclosure of credit risk exposure [line items] | ||
| Maximum exposure to credit risk | SFr 10,405 | SFr 85,565 |