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Share capital - Shelf registration statement (Details) | Apr. 28, 2021 CHF (SFr)
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Top of Range [Member] |
Disclosure of classes of share capital [line items] |
Capital authorized to be issued under Shelf Registration Statement | SFr 350,000,000

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- Definition Capital authorized to be issued under shelf registration statement + References No definition available. + Details
Name: | aciu_CapitalAuthorizedToBeIssuedUnderShelfRegistrationStatement
Namespace Prefix: | aciu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfClassesOfShareCapitalLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |