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Accrued expenses (Details) - CHF (SFr) SFr in Thousands | Jun. 30, 2026 | Dec. 31, 2025
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Trade and other payables and accrued expenses. |  |
Accrued Expenses | SFr 7,122 | SFr 8,067
Total | SFr 7,122 | SFr 8,067

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- Definition Accrued expenses + References No definition available. + Details
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Namespace Prefix: | aciu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of current accrued expenses. + References No definition available. + Details
Name: | aciu_CurrentAccruedExpenses
Namespace Prefix: | aciu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of current accrued expenses and other current liabilities. [Refer: Accruals; Other current liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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Balance Type: | credit
Period Type: | instant