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

- References

No definition available.

Name:	aciu_NumberOfNonVestedSharesAbstract
Namespace Prefix:	aciu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The number of other equity instruments (ie other than share options) vested in a share-based payment arrangement.

No definition available.

Name:	aciu_NumberOfOtherEquityInstrumentsVestedInShareBasedPaymentArrangement
Namespace Prefix:	aciu_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	aciu_ShareBasedPaymentArrangementAbstract
Namespace Prefix:	aciu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

For vesting requirements for a type of share-based payment arrangement that existed at any time during the period, this element represents the period which an employees right to exercise and award in no longer contingent on satisfaction of a service condition.

No definition available.

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

- References

No definition available.

Name:	aciu_WeightedAverageExercisePriceAbstract
Namespace Prefix:	aciu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The weighted average exercise price of other equity instruments (ie other than share options) vested in a share-based payment arrangement. [Refer: Weighted average [member]]

No definition available.

Name:	aciu_WeightedAverageExercisePriceOfOtherEquityInstrumentsVestedInShareBasedPaymentArrangement
Namespace Prefix:	aciu_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2016-01-13
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_47_b&doctype=Standard
-URIDate 2016-03-31

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2016-01-13
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_45&doctype=Standard
-URIDate 2016-03-31

Name:	ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2016-01-13
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2016-03-30&anchor=para_45&doctype=Standard
-URIDate 2016-03-31

Name:	ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

The number of other equity instruments (ie other than share options) expired in a share-based payment arrangement.

Name:	ifrs-full_NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement.

Name:	ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

Name:	ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

The weighted average exercise price of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. [Refer: Weighted average [member]]

Name:	ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

The weighted average exercise price of other equity instruments (ie other than share options) expired in a share-based payment arrangement. [Refer: Weighted average [member]]

Name:	ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

The weighted average exercise price of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement. [Refer: Weighted average [member]]

Name:	ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

The weighted average exercise price of other equity instruments (ie other than share options) granted in a share-based payment arrangement. [Refer: Weighted average [member]]

Name:	ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

The weighted average exercise price of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. [Refer: Weighted average [member]]

Name:	ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=aciu_RestrictedSharesAndRestrictedShareUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=aciu_RestrictedSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=aciu_RestrictedStockUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=aciu_BoardOfDirectorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: