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STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Related Party [Member]
Related party expense	$ (91)	$ 432

X

- Definition

Research and development expense (reversed).

+ References

No definition available.

+ Details

Name:	abio_ResearchAndDevelopmentExpenseReversed
Namespace Prefix:	abio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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