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Net Loss Per Share (Details Textual)	6 Months Ended
	Jun. 30, 2015 shares
Stock options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Securities in-the-money	0

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

Name:	abio_SecuritiesInMoney
Namespace Prefix:	abio_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems
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: