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Income taxes | 12 Months Ended
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Dec. 31, 2022
Income taxes [Abstract] |
Income taxes | 16.Income taxes The Group recognized less than CHF 0.1 million, less than CHF 0.1 million and nil in income taxes and no deferred tax asset or liability positions for the years ended December 31, 2022, 2021 and 2020, respectively. The Group’s expected tax expense for each year is based on the applicable tax rates in each jurisdiction. In 2022, these rates ranged from 13.6% to 33.8% (13.6% - 32.9% for 2021 and 13.6% for 2020) in the Group’s respective tax jurisdictions. The weighted average tax rate applicable to the Group was 13.6% (13.6% for 2021 and 2020, respectively). The Group’s income tax expense for each year can be reconciled to loss before tax as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
In CHF thousands |  | 2022 |  | 2021 |  | 2020
Loss before income tax |  | (70,740) |  | (72,993) |  | (61,921)
Tax benefit calculated at the domestic rates applicable in the respective countries |  | (9,616) |  | (9,930) |  | (8,441)
(Income not subject to tax)/expenses not deductible for tax purposes |  | 455 |  | (375) |  | 462
Effect of unused tax losses and tax offsets not recognized as deferred tax assets |  | 9,174 |  | 10,308 |  | 7,979
Effective income tax rate (benefit)/expense |  | 13 |  | 3 |  | —
​ The Swiss tax rate used for the 2022 reconciliations is the corporate tax rate of 13.6% (13.6% in 2021 and 2020, respectively) payable by corporate entities in the Canton of Vaud, Switzerland on taxable profits under tax law in that jurisdiction. The below table details the total unrecognized deductible temporary differences, unused tax losses and unused tax credits: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | December 31,
In CHF thousands |  | 2022 |  | 2021 |  | 2020
Unrecognized deductible temporary differences, unused tax losses and unused tax credits |  |  |  |  |  |
Deductible temporary differences, unused tax losses and unused tax credits for which no deferred tax assets have been recognized are attributable to the following: |  |  |  |  |  |
Tax losses |  | 264,089 |  | 197,152 |  | 121,948
Deductible temporary differences related to: |  |  |  |  |  |
Right-of-use assets and lease liabilities, net |  | — |  | — |  | —
Retirement benefit plan |  | 3,213 |  | 7,098 |  | 7,464
Total |  | 267,302 |  | 204,250 |  | 129,412
​ The following table details the tax losses carry forwards of the Company and their respective expiry dates: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | December 31,
In CHF thousands | ​ | 2022 | ​ | 2021 | ​ | 2020
Tax losses split by expiry date: |  |  |  |  |  |
December 31, 2024 | ​ | 15,231 | ​ | 15,231 |  | 15,231
December 31, 2025 |  | 48,894 |  | 48,894 |  | 48,894
December 31, 2026 |  | — |  | — |  | —
December 31, 2027 |  | 57,824 |  | 57,824 |  | 57,824
December 31, 2028 |  | 75,204 |  | 75,204 |  | —
December 31, 2029 |  | 66,936 |  | — |  | —
Total unrecorded tax loss carryforwards |  | 264,089 |  | 197,153 |  | 121,949
​ The tax losses available for future offset against taxable profits have increased by CHF 66.9 million from 2021, representing the amount of tax losses that are additionally available as an offset, subject to expiration as disclosed in the table above, against future taxable income. Consistent with prior years, the Company has not recorded any deferred tax assets in relation to the past tax losses available for offset against future profits as the recognition criteria were not met at the balance sheet date.

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