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

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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: