XML 45 R34.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Equity Financings and Warrants - Summary of Warrants by Year of Expiration (Details) | 12 Months Ended
--- | ---
Dec. 31, 2015 $ / shares shares
Class Of Warrant Or Right [Line Items] |
Number of Warrants | shares | 3,739,948
Weighted Average Exercise Price | $ / shares | $ 9.70
2016 |
Class Of Warrant Or Right [Line Items] |
Year of Expiration | 2016
Number of Warrants | shares | 82,816
Weighted Average Exercise Price | $ / shares | $ 68.19
2017 |
Class Of Warrant Or Right [Line Items] |
Year of Expiration | 2017
Number of Warrants | shares | 24,124
Weighted Average Exercise Price | $ / shares | $ 17.89
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_WarrantExpirationTwoThousandAndSixteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=abio_WarrantExpirationTwoThousandAndSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: |