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STATEMENTS OF PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (USD $) In Thousands, except Share data | Total USD ($) | Common stock USD ($) | Additional Paid-in Capital USD ($) | Accumulated Deficit USD ($) | Series A Convertible Preferred Stock
--- | --- | --- | --- | --- | ---
Beginning Balance, value at Dec. 31, 2012 | $ 2,907 us-gaap_StockholdersEquity | $ 3 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 70,898 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (67,994)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember |
Beginning Balance, shares at Dec. 31, 2012 |  | 2,660,315 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of common stock for cash, net of offering costs, shares |  | 521,066 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of common stock for cash, net of offering costs | 1,421 us-gaap_StockIssuedDuringPeriodValueNewIssues |  | 1,421 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Adjustment for fractional shares |  | (64)us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of common stock upon exercise of warrants for cash, shares |  | 4,245 abio_IssuanceOfCommonStockUponExerciseOfWarrantsForCashShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of common stock upon exercise of warrants for cash, value | 12 abio_IssuanceOfCommonStockUponExerciseOfWarrantsForCashValue |  | 12 abio_IssuanceOfCommonStockUponExerciseOfWarrantsForCashValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Issuance of Series A convertible preferred stock, net of offering costs, shares |  |  |  |  | 125,000 abio_PreferredStockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Issuance of Series A convertible preferred stock, net of offering costs | 17,917 abio_PreferredStockIssuedDuringPeriodValueNewIssues |  | 17,917 abio_PreferredStockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Deemed preferred stock dividend for beneficial conversion feature | 2,026 abio_DeemedDividendBeneficialConversionPreferredStock |  | 2,026 abio_DeemedDividendBeneficialConversionPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Less: Deemed preferred stock dividend | (2,026)us-gaap_PreferredStockDividendsAndOtherAdjustments |  | (2,026)us-gaap_PreferredStockDividendsAndOtherAdjustments / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Conversion of preferred stock, shares |  | 12,500,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | (125,000)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Conversion of preferred stock | (20)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities | 13 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (33)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Share-based compensation | 283 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 283 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Net loss | (6,939)us-gaap_NetIncomeLoss |  |  | (6,939)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember |
Ending Balance, value at Dec. 31, 2013 | 15,581 us-gaap_StockholdersEquity | 16 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 90,498 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (74,933)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember |
Ending Balance, shares at Dec. 31, 2013 |  | 15,685,562 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of common stock for cash, net of offering costs, shares |  | 5,116,228 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of common stock for cash, net of offering costs | 7,866 us-gaap_StockIssuedDuringPeriodValueNewIssues | 5 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 7,861 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Issuance of common stock upon exercise of warrants for cash, shares |  | 209,025 abio_IssuanceOfCommonStockUponExerciseOfWarrantsForCashShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of common stock upon exercise of warrants for cash, value | 338 abio_IssuanceOfCommonStockUponExerciseOfWarrantsForCashValue |  | 338 abio_IssuanceOfCommonStockUponExerciseOfWarrantsForCashValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Share-based compensation | 647 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 647 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Net loss | (9,689)us-gaap_NetIncomeLoss |  |  | (9,689)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember |
Issuance of common stock upon vesting of Restricted Stock Awards, shares |  | 139,671 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of common stock upon vesting of Restricted Stock Awards, value | (2)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures |  | (2)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Ending Balance, value at Dec. 31, 2014 | $ 14,741 us-gaap_StockholdersEquity | $ 21 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 99,342 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (84,622)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDeficitDuringDevelopmentStageMember |
Ending Balance, shares at Dec. 31, 2014 |  | 21,150,486 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |

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