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Net Loss Per Share (Details Textual) | 12 Months Ended
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Dec. 31, 2014
Equity Option |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |
Securities in-the-money | 0 abio_SecuritiesInMoney / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember
Warrant |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |
Securities in-the-money | 0 abio_SecuritiesInMoney / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember

X
- Definition This represents the number of securities that are "in-the-money" as of the end of the reporting period. + References No definition available. + Details
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Namespace Prefix: | abio_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_StockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_WarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |