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v3.22.4

Share capital - Conditional share capital for employee benefit plans (Details) | 12 Months Ended
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Dec. 31, 2022 CHF (SFr) SFr / shares shares
Conditional Share Capital [Abstract] |
Nominal value per share (in CHF per share) | SFr 0.02
Employee Benefit Plans [Member] |
Conditional Share Capital [Abstract] |
Nominal value per share (in CHF per share) | SFr 0.02
Employee Benefit Plans [Member] | Top of Range [Member] |
Conditional Share Capital [Abstract] |
Maximum aggregate amount of ordinary shares | SFr | SFr 96,000
Issuance of ordinary shares (in shares) | shares | 4,800,000

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

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- Definition The potential increase in equity from share-based payment transactions. + 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 The total number of potential shares issued through share-based payment transactions. + References No definition available. + Details
Name: | aciu_PotentialNumberOfSharesIssuedFromShareBasedPaymentTransactions
Namespace Prefix: | aciu_
Data Type: | xbrli:sharesItemType
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

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- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=aciu_ConditionalShareCapitalForEmployeeBenefitPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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