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Cover
Jul. 03, 2024
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jul. 03, 2024
Entity File Number 000-22873
Entity Registrant Name ARCA biopharma, Inc.
Entity Central Index Key 0000907654
Entity Tax Identification Number 36-3855489
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 10170 Church Ranch Way
Entity Address, Address Line Two Suite 100
Entity Address, City or Town Westminster,
Entity Address, State or Province CO
Entity Address, Postal Zip Code 80021
City Area Code 720
Local Phone Number 940-2100
Written Communications true
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.001 par value
Trading Symbol ABIO
Security Exchange Name NASDAQ
Entity Emerging Growth Company false