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Prepaid expenses and accrued income (Details) - CHF (SFr) SFr in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Prepaid expenses and accrued income [Abstract] |  |
Prepaid expenses | SFr 4,708 | SFr 3,015
Accrued income | 408 | 975
Total prepaid expenses and accrued income | 5,116 | 3,990
Grants, Michael J. Fox Foundation and Target ALS |  |
Prepaid expenses and accrued income [Abstract] |  |
Accrued income | SFr 400 |
Percentage of accrued income | 100.00% |
Grants, Michael J. Fox Foundation [Member] |  |
Prepaid expenses and accrued income [Abstract] |  |
Accrued income | SFr 300 | SFr 900
Percentage of accrued income |  | 87.00%

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- Definition The amount of current accrued income including current contract assets. [Refer: Accrued income including contract assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount recognised as a current asset for expenditures made prior to the period when the economic benefit will be realised. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of current prepayments and current accrued income including current contract assets. [Refer: Prepayments; Accrued income including contract assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78&doctype=Standard -URIDate 2021-03-24 + Details
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