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Financial instruments and risk management (Details) SFr in Thousands | 12 Months Ended
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Dec. 31, 2022 CHF (SFr) Institution | Dec. 31, 2021 CHF (SFr) | Dec. 31, 2020 CHF (SFr)
Financial assets and liabilities [Abstract] |  |  |
Financial assets | SFr 126,147 | SFr 201,921 |
Financial liabilities | 13,147 | 21,649 |
Financial risks [Abstract] |  |  |
Foreign exchange gains (losses) | 393 | 113 | SFr (555)
Long-term lease liabilities |  |  |
Financial assets and liabilities [Abstract] |  |  |
Financial liabilities | 2,253 | 2,340 |
Trade and other payables |  |  |
Financial assets and liabilities [Abstract] |  |  |
Financial liabilities | 929 | 2,003 |
Accrued expenses |  |  |
Financial assets and liabilities [Abstract] |  |  |
Financial liabilities | 9,417 | 16,736 |
Short-term lease liabilities |  |  |
Financial assets and liabilities [Abstract] |  |  |
Financial liabilities | 548 | 570 |
Right-of-use assets |  |  |
Financial assets and liabilities [Abstract] |  |  |
Financial assets | 2,808 | 2,914 |
Long-term financial assets |  |  |
Financial assets and liabilities [Abstract] |  |  |
Financial assets | 361 | 363 |
Other current receivables [Member] |  |  |
Financial assets and liabilities [Abstract] |  |  |
Financial assets | 392 | 428 |
Short-term financial assets |  |  |
Financial assets and liabilities [Abstract] |  |  |
Financial assets | 91,000 | 116,000 |
Cash and cash equivalents |  |  |
Financial assets and liabilities [Abstract] |  |  |
Financial assets | 31,586 | 82,216 |
Foreign Currency Exchange Risk [Member] |  |  |
Financial risks [Abstract] |  |  |
Foreign exchange gains (losses) | SFr 500 | (100) | SFr (700)
Percentage of reasonably possible strengthening or weakening of reporting currency against other relevant currencies | 10.00% |  |
Increase (decrease) in profit (loss) resulting from reasonably possible strengthening or weakening of reporting currency against other relevant currencies | SFr 700 | SFr 1,700 |
Credit Risk [Member] |  |  |
Financial risks [Abstract] |  |  |
Number of financial institutions holding cash and cash equivalents and short-term financial assets | Institution | 5 |  |
Liquidity Risk [Member] |  |  |
Financial risks [Abstract] |  |  |
Cash position rolling forecast period | 18 months |  |
Liquidity Risk [Member] | Trade and other payables |  |  |
Financial assets and liabilities [Abstract] |  |  |
Financial liabilities | SFr 900 |  |
Liquidity Risk [Member] | Accrued expenses |  |  |
Financial assets and liabilities [Abstract] |  |  |
Financial liabilities | 9,400 |  |
Interest Rate [member] |  |  |
Financial risks [Abstract] |  |  |
Cash and cash equivalents subject to negative interest rates | SFr 0 |  |
Percentage of reasonably possible increase or decrease in interest rates | 10.00% |  |
Interest Rate [member] | Top of Range [Member] |  |  |
Financial risks [Abstract] |  |  |
Increase (decrease) in profit (loss) resulting from reasonably possible increase or decrease in interest rates | SFr 200 |  |

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35I&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35M&doctype=Standard -URIDate 2021-03-24 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35N&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 + Details
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