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v3.24.2.u1

STATEMENTS OF OPERATIONS (Unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Related Party [Member] |  |  |  |
Related party expense | $ 0 | $ 108 | $ 0 | $ 216

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- Definition Research and development expense (reversed). + References No definition available. + Details
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Namespace Prefix: | abio_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_RelatedPartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |