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Share capital - Conditional share capital for bonds and similar debt instruments (Details)	12 Months Ended
	Dec. 31, 2022 CHF (SFr) SFr / shares shares
Conditional Share Capital [Abstract]
Nominal value per share (in CHF per share)	SFr 0.02
Bonds and Similar Debt Instruments [Member]
Conditional Share Capital [Abstract]
Nominal value per share (in CHF per share)	SFr 0.02
Bonds and Similar Debt Instruments [Member] | Top of Range [Member]
Conditional Share Capital [Abstract]
Potential increase is equity through conversion of debt instruments | SFr	SFr 100,000
Potential number of shares issued from conversion of debt instruments | shares	5,000,000

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- References

No definition available.

+ Details

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- Definition

Potential increase is equity through conversion of debt instruments

+ References

No definition available.

+ Details

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Namespace Prefix:	aciu_
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Balance Type:	credit
Period Type:	duration

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- Definition

Potential number of shares issued from conversion of debt instruments

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

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- Definition

The nominal value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 79
-Subparagraph a
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a_iii&doctype=Standard
-URIDate 2021-03-24

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Period Type:	instant

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- Details

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- Details

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