Payment(s) received for milestone payments associated with a collaborative agreement.

No definition available.

Name:	aciu_CollaborativeAgreementMilestonePaymentReceived
Namespace Prefix:	aciu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period of time that notice is required to be given for cancellation of the collaborative agreement contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	aciu_CollaborativeAgreementNoticeOfContractTerminationPeriod
Namespace Prefix:	aciu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The total potential value of the collaborative agreement.

+ References

No definition available.

+ Details

Name:	aciu_CollaborativeAgreementPotentialValue
Namespace Prefix:	aciu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
-Paragraph 114
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_114&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
-Paragraph 113
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_113_a&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_RevenueFromContractsWithCustomers
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
-Paragraph 120
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_120_a&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_TransactionPriceAllocatedToRemainingPerformanceObligations
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	ifrs-full_TypesOfContractsAxis=aciu_LicenseAndCollaborationAgreementOf2014LifeMolecularImagingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ProductsAndServicesAxis=aciu_TauPETImagingAgentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_PerformanceObligationsAxis=aciu_ClinicalMilestonesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_PerformanceObligationsAxis=aciu_RegulatoryAndSalesBasedMilestonesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
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Contract revenues - Tau-PET imaging agent -2014 Agreement with Life Molecular Imaging (formerly Piramal Imaging SA) (Details) € in Thousands, SFr in Thousands			3 Months Ended						12 Months Ended
	Dec. 31, 2015 CHF (SFr)	Dec. 31, 2015 EUR (€)	Sep. 30, 2022 CHF (SFr)	Sep. 30, 2022 EUR (€)	Sep. 30, 2019 CHF (SFr)	Sep. 30, 2019 EUR (€)	Mar. 31, 2017 CHF (SFr)	Mar. 31, 2017 EUR (€)	Dec. 31, 2023 CHF (SFr)	Dec. 31, 2022 CHF (SFr)	Dec. 31, 2021 CHF (SFr)	Dec. 31, 2023 EUR (€)	May 31, 2014 CHF (SFr)	May 31, 2014 EUR (€)
Contract revenues
Revenue from contracts with customers									SFr 14,801	SFr 3,935	SFr 0
2014 Agreement with Life Molecular Imaging (formerly Piramal Imaging SA) [Member]
Contract revenues
Revenue from contracts with customers									SFr 0	3,935	0
Tau-PET Imaging Agent [Member] \| 2014 Agreement with Life Molecular Imaging (formerly Piramal Imaging SA) [Member]
Contract revenues
Period to provide notice of termination of agreement									3 months
Revenue from contracts with customers	SFr 664	€ 500	SFr 3,900	€ 4,000	SFr 2,200	€ 2,000			SFr 0	SFr 3,900	SFr 0
Collaborative agreement, Milestone payment received							SFr 1,100	€ 1,000
Tau-PET Imaging Agent [Member] \| 2014 Agreement with Life Molecular Imaging (formerly Piramal Imaging SA) [Member] \| Clinical milestones
Contract revenues
Total potential collaboration agreement value remaining									4,000			€ 4,000
Tau-PET Imaging Agent [Member] \| 2014 Agreement with Life Molecular Imaging (formerly Piramal Imaging SA) [Member] \| Regulatory and sales-based milestones
Contract revenues
Total potential collaboration agreement value remaining									SFr 139,000			€ 148,000
Tau-PET Imaging Agent [Member] \| 2014 Agreement with Life Molecular Imaging (formerly Piramal Imaging SA) [Member] \| Top of Range [Member]
Contract revenues
Total potential collaboration agreement value													SFr 151,000	€ 160,000