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Related Party Arrangements (Details) (USD $) | 12 Months Ended | 144 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013
Related Party Transactions (Textual) [Abstract] |  |  |
Total expense | $ 297,000 | $ 63,000 |
Amount from Inception |  |  | $ 1,800,000

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- Definition Related party transactions aggregate research and development expense from its inception. + References No definition available. + Details
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Namespace Prefix: | abio_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Related party transactions research and development expense. + References No definition available. + Details
Name: | abio_RelatedPartyTransactionsResearchAndDevelopmentExpense
Namespace Prefix: | abio_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | abio_RelatedPartyTransactionsTextualAbstract
Namespace Prefix: | abio_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration