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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 $ 2,907us-gaap_StockholdersEquity $ 3us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 70,898us-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   2,660,315us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock for cash, net of offering costs, shares   521,066us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock for cash, net of offering costs 1,421us-gaap_StockIssuedDuringPeriodValueNewIssues   1,421us-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   4,245abio_IssuanceOfCommonStockUponExerciseOfWarrantsForCashShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock upon exercise of warrants for cash, value 12abio_IssuanceOfCommonStockUponExerciseOfWarrantsForCashValue   12abio_IssuanceOfCommonStockUponExerciseOfWarrantsForCashValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Issuance of Series A convertible preferred stock, net of offering costs, shares         125,000abio_PreferredStockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
Issuance of Series A convertible preferred stock, net of offering costs 17,917abio_PreferredStockIssuedDuringPeriodValueNewIssues   17,917abio_PreferredStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Deemed preferred stock dividend for beneficial conversion feature 2,026abio_DeemedDividendBeneficialConversionPreferredStock   2,026abio_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   12,500,000us-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 13us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 (33)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Share-based compensation 283us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   283us-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 15,581us-gaap_StockholdersEquity 16us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 90,498us-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   15,685,562us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock for cash, net of offering costs, shares   5,116,228us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock for cash, net of offering costs 7,866us-gaap_StockIssuedDuringPeriodValueNewIssues 5us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 7,861us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Issuance of common stock upon exercise of warrants for cash, shares   209,025abio_IssuanceOfCommonStockUponExerciseOfWarrantsForCashShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock upon exercise of warrants for cash, value 338abio_IssuanceOfCommonStockUponExerciseOfWarrantsForCashValue   338abio_IssuanceOfCommonStockUponExerciseOfWarrantsForCashValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    
Share-based compensation 647us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue   647us-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   139,671us-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 $ 14,741us-gaap_StockholdersEquity $ 21us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 99,342us-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   21,150,486us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember