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Summary of significant accounting policies, Right-of-use assets and lease liabilities (Details)	12 Months Ended
	Dec. 31, 2022
Buildings [Member]
Right-of-use assets and lease liabilities:
Estimated lease term	5 years
Office Equipment [Member]
Right-of-use assets and lease liabilities:
Estimated lease term	5 years
IT Equipment
Right-of-use assets and lease liabilities:
Estimated lease term	5 years

X

- Definition

The estimated lease term, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_OfficeEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_ComputerEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: