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Document And Entity Information	3 Months Ended
	Mar. 31, 2024
Document Information Line Items
Entity Registrant Name	ARCA BIOPHARMA, INC.
Document Type	S-4
Amendment Flag	false
Entity Central Index Key	0000907654
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Incorporation, State or Country Code	DE

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