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Share capital - Authorized capital (Details) | 12 Months Ended
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Dec. 31, 2022 CHF (SFr) SFr / shares shares
Share capital |
Additional share capital that Board of Directors are authorized to issue | SFr | SFr 400,000
Number of additional shares that Board of Directors are authorized to issue | shares | 20,000,000
Nominal value per share (in CHF per share) | SFr / shares | SFr 0.02

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- Definition Additional share capital that Board of Directors are authorized to issue + References No definition available. + Details
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Namespace Prefix: | aciu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of additional shares that Board of Directors are authorized to issue + References No definition available. + Details
Name: | aciu_NumberOfAdditionalSharesThatBoardOfDirectorsAreAuthorizedToIssue
Namespace Prefix: | aciu_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfClassesOfShareCapitalAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a_iii&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_ParValuePerShare
Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant