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Right-of-use assets, long-term financial assets and lease liabilities (Details) - CHF (SFr) SFr in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Right-of-use assets and lease liabilities: |  |
Additions and remeasurements | SFr 460 | SFr 1,215
Right-of-use of leased assets: |  |
Balance, beginning of period | 2,914 | 2,223
Depreciation | (566) | (509)
Dispositions |  | (15)
Balance, end of period | 2,808 | 2,914
Buildings |  |
Right-of-use assets and lease liabilities: |  |
Additions and remeasurements | SFr 460 | SFr 1,144
Weighted average incremental borrowing rate | 3.50% | 2.50%
Right-of-use of leased assets: |  |
Balance, beginning of period | SFr 2,776 | SFr 2,106
Depreciation | (528) | (474)
Balance, end of period | 2,708 | 2,776
Office Equipment |  |
Right-of-use assets and lease liabilities: |  |
Additions and remeasurements | SFr 0 | SFr 71
Weighted average incremental borrowing rate | 5.30% | 5.30%
Right-of-use of leased assets: |  |
Balance, beginning of period | SFr 98 | SFr 63
Depreciation | (24) | (21)
Dispositions |  | (15)
Balance, end of period | 74 | 98
IT Equipment |  |
Right-of-use assets and lease liabilities: |  |
Additions and remeasurements | SFr 0 | SFr 0
Weighted average incremental borrowing rate | 2.60% | 2.60%
Right-of-use of leased assets: |  |
Balance, beginning of period | SFr 40 | SFr 54
Depreciation | (14) | (14)
Balance, end of period | SFr 26 | SFr 40

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- Definition The amount of decrease in right-of-use assets from disposals. + 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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- References No definition available. + Details
Name: | aciu_RightOfUseLeasedAssetsAbstract
Namespace Prefix: | aciu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_h&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_a&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | na
Period Type: | duration

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

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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_j&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_RightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph C12 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_C12_a&doctype=Appendix&subtype=C -URIDate 2021-03-24 + Details
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- Details
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- Details
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Period Type: |

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- Details
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Balance Type: |
Period Type: |