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The Company and Summary of Significant Accounting Policies (Details) (USD $)	0 Months Ended	12 Months Ended		0 Months Ended			1 Months Ended
	Mar. 04, 2013	Dec. 31, 2014 Segment	Dec. 31, 2013	Feb. 18, 2015	Feb. 03, 2014	Jan. 31, 2013	Feb. 28, 2014
Company Basis of Presentation (Textual) [Abstract]
Date of completion of business combination with Nuvelo		Jan. 27, 2009
Revenues		$ 0us-gaap_Revenues
Fund raised through sale of convertible preferred and common stock			19,300,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Proceeds from the issuance of common stock		9,038,000us-gaap_ProceedsFromIssuanceOfCommonStock	1,741,000us-gaap_ProceedsFromIssuanceOfCommonStock
Notification for delisting of shares		On February 18, 2015, we received notification from NASDAQ of potential delisting of our shares from the NASDAQ Capital Market because the closing bid price of our common stock had not met the minimum closing bid price of $1.00 per share during the preceding 30 days. NASDAQ rules provided us a 180 calendar day grace period from the date of the Notice to regain compliance by meeting the continued listing standard. The continued listing standard would be met if our common stock has a minimum closing bid price of at least $1.00 per share for a minimum of 10 consecutive business days during the 180 calendar day grace period.
Reverse stock split	1-for-6 reverse split
Concentrations of credit risk		0us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
Number of segments		1us-gaap_NumberOfOperatingSegments
Subsequent Event
Company Basis of Presentation (Textual) [Abstract]
Minimum closing bid price of common stock				$ 1.00abio_ClosingBidPriceOfCommonStock / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Number of grace days provided by NASDAQ to meet continued listing standard				180 days
Registered Direct Offering
Company Basis of Presentation (Textual) [Abstract]
Proceeds from the issuance of common stock					$ 8,700,000us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsidiarySaleOfStockAxis = abio_RegisteredDirectOfferingMember	$ 730,000us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsidiarySaleOfStockAxis = abio_RegisteredDirectOfferingMember	$ 7,900,000us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsidiarySaleOfStockAxis = abio_RegisteredDirectOfferingMember
Phase 3 heart failure (HF) trial of Gencaro | BEST Trial
Company Basis of Presentation (Textual) [Abstract]
Number of patients		2,708abio_NumberOfPatients / abio_ClinicalTrialsByPhaseAxis = abio_PhaseThreeHeartFailureMember / us-gaap_HealthCareTrustFundAxis = abio_BestTrialMember
Phase 3 heart failure (HF) trial of Gencaro | GENETIC-AF Trial
Company Basis of Presentation (Textual) [Abstract]
Number of patients company plans to enroll		420abio_NumberOfPatientsCompanyPlansToEnroll / abio_ClinicalTrialsByPhaseAxis = abio_PhaseThreeHeartFailureMember / us-gaap_HealthCareTrustFundAxis = abio_GENETICAFTrialMember
Phase Two B Heart Failure | GENETIC-AF Trial
Company Basis of Presentation (Textual) [Abstract]
Number of patients company plans to enroll		200abio_NumberOfPatientsCompanyPlansToEnroll / abio_ClinicalTrialsByPhaseAxis = abio_PhaseTwoBHeartFailureMember / us-gaap_HealthCareTrustFundAxis = abio_GENETICAFTrialMember
Original
Company Basis of Presentation (Textual) [Abstract]
Business combination with Nuvelo, date of agreement		Sep. 24, 2008
Amendment
Company Basis of Presentation (Textual) [Abstract]
Business combination with Nuvelo, date of agreement		Oct. 28, 2008

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