XML 49 R38.htm IDEA: XBRL DOCUMENT v3.8.0.1

Equity Financings and Warrants - Summary of Warrants by Year of Expiration (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Class Of Warrant Or Right [Line Items]
Number of Warrants | shares	3,633,008
Weighted Average Exercise Price | $ / shares	$ 8.32
2018
Class Of Warrant Or Right [Line Items]
Year of Expiration	2018
Number of Warrants | shares	963,153
Weighted Average Exercise Price | $ / shares	$ 11.77
2019
Class Of Warrant Or Right [Line Items]
Year of Expiration	2019
Number of Warrants | shares	224,323
Weighted Average Exercise Price | $ / shares	$ 15.73
2020
Class Of Warrant Or Right [Line Items]
Year of Expiration	2020
Number of Warrants | shares	44,299
Weighted Average Exercise Price | $ / shares	$ 15.96
2022
Class Of Warrant Or Right [Line Items]
Year of Expiration	2022
Number of Warrants | shares	2,401,233
Weighted Average Exercise Price | $ / shares	$ 6.10

X

- Definition

Year during which outstanding warrants of company stock will expire.

+ References

No definition available.

+ Details

Name:	abio_WarrantsExpirationYear
Namespace Prefix:	abio_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average exercise price of warrants or rights.

+ References

No definition available.

+ Details

Name:	abio_WeightedAverageExercisePriceOfWarrantsOrRights
Namespace Prefix:	abio_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

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_ClassOfWarrantOrRightLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=abio_WarrantExpirationTwoThousandAndEighteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=abio_WarrantExpirationTwoThousandAndNineteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=abio_WarrantExpirationTwoThousandAndTwentyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=abio_WarrantExpirationTwoThousandAndTwentyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: