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Related-party transactions (Details) SFr in Thousands	12 Months Ended
	Dec. 31, 2022 CHF (SFr) person	Dec. 31, 2021 CHF (SFr) person	Dec. 31, 2020 CHF (SFr) person
Related-party transactions [Abstract]
Number of individuals, Board of Directors | person	8	8	7
Number of individuals, Executive Management | person	7	6	5
Short-term employee benefits	SFr 4,187	SFr 4,403	SFr 3,497
Post-employment benefits	295	266	214
Share-based compensation	2,503	2,997	2,578
Total compensation	SFr 6,985	SFr 7,666	SFr 6,289

X

- Definition

The number of persons that are the included in Board of Directors excluding the Chief Executive Officer.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

The number of persons that comprise key management of the entity that are Executive Management.

+ References

No definition available.

+ Details

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Namespace Prefix:	aciu_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- References

No definition available.

+ Details

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X

- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2021-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_17&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

X

- Definition

The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2021-01-01
-Paragraph 17
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_17_b&doctype=Standard
-URIDate 2021-03-24

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2021-01-01
-Paragraph 17
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_17_e&doctype=Standard
-URIDate 2021-03-24

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X

- Definition

The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2021-01-01
-Paragraph 17
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_17_a&doctype=Standard
-URIDate 2021-03-24

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