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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 | $ 113,700,000 us-gaap_OperatingLossCarryforwards |
Tax Credit Carryforward, Description | The net operating loss carryforwards will expire beginning 2025 through 2034. |
Valuation allowance | 44,500,000 us-gaap_DeferredTaxAssetsValuationAllowance |
Decrease net deferred tax asset | 400,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |
Federal statutory income tax rate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Provision for income taxes | 0 us-gaap_IncomeTaxExpenseBenefit | 0 us-gaap_IncomeTaxExpenseBenefit
Reserve for uncertain tax positions | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Interest or penalties recognized | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | 0 us-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 | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = abio_WithoutDeferredTaxLiabilityOnImpairedInProcessResearchAndDevelopmentMember |
Research Tax Credit Carryforward |  |
Income Taxes (Textual) [Abstract] |  |
Research and experimentation credits | $ 991,000 us-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 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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