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Expenses by category (Details) SFr in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 CHF (SFr) employee | Dec. 31, 2021 CHF (SFr) employee | Dec. 31, 2020 CHF (SFr) employee
Disclosure of detailed information about borrowings [line items] |  |  |
Operating expenses | SFr 74,782 | SFr 79,010 | SFr 76,691
Research and development expenses | 60,336 | 62,282 | 59,487
General and administrative expenses | 15,789 | 17,910 | 18,557
Financial result, net [Abstract] |  |  |
Financial income | 69 | 6,485 | 78
Financial expense | (355) | (581) | (184)
Exchange differences | 393 | 113 | (555)
Finance result, net | 107 | 6,017 | (661)
Gains on conversion features related to convertible notes |  | 6,500 |
Research and development expenses |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Operating expenses | 41,166 | 44,289 | 43,787
Payroll expenses | 17,548 | 16,465 | 14,424
Share-based compensation | 1,622 | 1,528 | 1,276
Total expenses by category | SFr 60,336 | SFr 62,282 | SFr 59,487
Average number of employees | employee | 122.4 | 108.6 | 115.3
General and administrative expenses |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Operating expenses | SFr 6,207 | SFr 7,031 | SFr 7,471
Payroll expenses | 7,874 | 8,281 | 8,274
Share-based compensation | 1,708 | 2,598 | 2,812
Total expenses by category | SFr 15,789 | SFr 17,910 | SFr 18,557
Average number of employees | employee | 22.5 | 27.3 | 26.7

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