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Share-based compensation - Restricted share awards (Details) | 6 Months Ended
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Jun. 30, 2026 CHF (SFr) EquityInstruments | Jun. 30, 2025 CHF (SFr)
Weighted Average grant date fair value [Abstract] |  |
Expense from share-based payment transactions with employees | SFr | SFr 2,600,000 | SFr 2,700,000
Restricted share awards, non-vested |  |
Share-based payment arrangement [Abstract] |  |
Number of non-vested share awards granted (in shares) | EquityInstruments | 1,243,267 |
Number of non-vested shares [Abstract] |  |
Non-vested at beginning of period | EquityInstruments | 763,816 |
Forfeited during the period | EquityInstruments | (53,409) |
Exercised during the period | EquityInstruments | (164,902) |
Granted during the period | EquityInstruments | 1,243,267 |
Vested during the period | EquityInstruments | (483,081) |
Non-vested at end of period | EquityInstruments | 1,473,029 |
Weighted Average grant date fair value [Abstract] |  |
Weighted average grant date fair value, non-vested at beginning of period | SFr | SFr 2.62 |
Weighted average grant date fair value, forfeited during the period | SFr | 2.63 |
Weighted average grant date fair value, exercised during the period | SFr | 2.57 |
Weighted average grant date fair value, granted during the period | SFr | 2.42 |
Weighted average grant date fair value, vested during the period | SFr | 2.33 |
Weighted average grant date fair value, non-vested at end of period | SFr | SFr 2.55 |
Restricted share awards, vested |  |
Number of non-vested shares [Abstract] |  |
Vested and exercisable | EquityInstruments | 2,891,435 |
Weighted Average grant date fair value [Abstract] |  |
Weighted average grant date fair value, vested and exercisable | SFr | SFr 2.83 |

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