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Cash and cash equivalents and short-term financial assets - Short-term financial assets (Details) - CHF (SFr) SFr in Thousands | 6 Months Ended |
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Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Miscellaneous current assets [abstract] |  |  |
Short-term financial assets due in one year or less | SFr 47,600 |  | SFr 64,617
Payments (proceeds) from purchases (sales) of short-term financial assets, classified as investing activities | SFr (17,017) | SFr (27,801) |

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- Definition Payments (proceeds) from purchases (sales) of short-term financial assets, classified as investing activities + References No definition available. + Details
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Namespace Prefix: | aciu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_MiscellaneousCurrentAssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of short-term deposits held by the entity that are not classified as cash equivalents. [Refer: Cash equivalents] + 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
Name: | ifrs-full_ShorttermDepositsNotClassifiedAsCashEquivalents
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant