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Commitments and Contingencies (Details Textual) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Aug. 01, 2013 sqft
Commitments and Contingencies (Textual) [Abstract] |  |  |
Clinical research agreement with Duke University, termination notice period | 90 days |  |
Expected milestone payments due upon approval | $ 8,000,000 abio_ExpectedMilestonePaymentsUponApproval |  |
Another expected milestone payments due upon approval | 5,000,000 abio_AnotherExpectedMilestonePaymentsUponApproval |  |
Minimum percentage of royalty obligation | 12.50%abio_MinimumPercentageOfRoyaltyObligation |  |
Maximum percentage of royalty obligation | 25.00%abio_MaximumPercentageOfRoyaltyObligation |  |
Product sales levels royalty | 5.00%abio_PercentageOfRoyaltyObligatedToPayUnderItsOriginalLicenseAgreement |  |
Minimum percentage of range of royalties that can be bought down | 12.50%abio_MinimumPercentageOfRangeOfRoyaltiesThatCanBeBuyDown |  |
Maximum percentage of range of royalties that can be bought down | 17.00%abio_MaximumPercentageOfRangeOfRoyaltiesThatCanBeBuyDown |  |
Royalty buy down due period | 6 months |  |
Rent expense | $ 78,000 us-gaap_OperatingLeasesRentExpenseNet | $ 63,000 us-gaap_OperatingLeasesRentExpenseNet |
Westminster, Colorado |  |  |
Commitments and Contingencies (Textual) [Abstract] |  |  |
Area of office facilities taken on lease |  |  | 5,300 us-gaap_AreaOfRealEstateProperty / us-gaap_StatementGeographicalAxis = abio_WestminsterMember
Lease term | 3 years |  |
Lease expiry date | Sep. 30, 2016 |  |

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