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Property and Equipment (Details Textual) (USD $)	12 Months Ended		132 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012
Property and Equipment (Textual) [Abstract]
Depreciation and amortization expense	$ 43,000	$ 602,000
Depreciation and amortization expense since inception			$ 1,800,000

X

- Definition

Depreciation and amortization expense since inception.

+ References

No definition available.

+ Details

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Namespace Prefix:	abio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	abio_PropertyAndEquipmentTextualAbstract
Namespace Prefix:	abio_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

+ Details

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Balance Type:	debit
Period Type:	duration