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Income Taxes (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Taxes (Textual) [Abstract]    
Net operating loss carryforwards $ 113,700,000us-gaap_OperatingLossCarryforwards  
Tax Credit Carryforward, Description The net operating loss carryforwards will expire beginning 2025 through 2034.  
Valuation allowance 44,500,000us-gaap_DeferredTaxAssetsValuationAllowance  
Decrease net deferred tax asset 400,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Federal statutory income tax rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Provision for income taxes 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit
Reserve for uncertain tax positions 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Interest or penalties recognized 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Open tax year 2009  
Without Deferred Tax Liability On Impaired In Process Research And Development    
Income Taxes (Textual) [Abstract]    
Provision for income taxes 0us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= abio_WithoutDeferredTaxLiabilityOnImpairedInProcessResearchAndDevelopmentMember		  
Research Tax Credit Carryforward    
Income Taxes (Textual) [Abstract]    
Research and experimentation credits $ 991,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember		  
Operating loss carryforwards, limitations on use Utilization of net operating losses and tax credits, including those acquired as a result of the Merger, will be subject to an annual limitation due to ownership change limitations provided by IRC Section 382. The annual limitation may result in the expiration of the net operating losses and credits before utilization. As such, a portion of the Company’s net operating loss carryforwards may be limited  
Tax credit carryforward, limitations on use Utilization of net operating losses and tax credits, including those acquired as a result of the Merger, will be subject to an annual limitation due to ownership change limitations provided by IRC Section 382. The annual limitation may result in the expiration of the net operating losses and credits before utilization. As such, a portion of the Company’s net operating loss carryforwards may be limited  
Earliest Tax Year    
Income Taxes (Textual) [Abstract]    
Operating loss carryforwards expiration year 2025  
Latest Tax Year    
Income Taxes (Textual) [Abstract]    
Operating loss carryforwards expiration year 2034