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Subsequent Event (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 25, 2019 | Feb. 22, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Subsequent Event [Line Items] |  |  |  |
Common stock, shares issued |  |  | 13,924,058 | 11,775,062
Proceeds from the issuance of common stock |  |  | $ 3,532 | $ 6,551
Sales Agreement |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Aggregate offering price of common stock authorized |  |  | $ 10,200 |
Common stock, shares issued |  |  | 2,133,828 | 2,677,525
Net proceeds from issuance of common stock |  |  | $ 3,400 | $ 6,100
Subsequent Event | Sales Agreement |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Aggregate offering price of common stock additional authorized offering amount under agreement to sell | $ 2,500 |  |  |
Aggregate offering price of common stock authorized | $ 12,700 |  |  |
Common stock, shares issued |  | 4,431,053 |  |
Proceeds from the issuance of common stock |  | $ 2,500 |  |
Net proceeds from issuance of common stock |  | $ 2,400 |  |

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- Definition Common stock additional authorized offering amount under agreement to sell. + References No definition available. + Details
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Namespace Prefix: | abio_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Common stock, authorized offering amount under agreement to sell. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from entity's raising of capital via registered direct offering, net of related financing costs. + References No definition available. + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- 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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