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Subsequent Event (Details Textual) - USD ($)		12 Months Ended
	Jan. 11, 2017	Dec. 31, 2015	Dec. 31, 2016
Subsequent Event [Line Items]
Common stock, par value		$ 0.001	$ 0.001
Proceeds from sale of common stock		$ 37,000,000
Subsequent Event | JonesTrading
Subsequent Event [Line Items]
Percentage of selling commission per share sold	3.00%
Subsequent Event | Sales Agreement | JonesTrading
Subsequent Event [Line Items]
Common stock, par value	$ 0.001
Proceeds from sale of common stock	$ 0
Subsequent Event | Maximum | Sales Agreement | JonesTrading
Subsequent Event [Line Items]
Aggregate offering price of common stock	$ 7,300,000

X

- Definition

Aggregate offering price of common stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	abio_
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X

- Definition

Selling commission per share sold percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	abio_
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Balance Type:	na
Period Type:	instant

X

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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X

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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- Details

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X

- Details

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- Details

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