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Summary of Significant Accounting Policies (Details 4) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investment Concentration Risk        
Cash, cash equivalents and investments 144,200,000us-gaap_InvestmentsAndCash      
Investment in institutional money market funds 77,300,000us-gaap_MoneyMarketFundsAtCarryingValue      
Cash and cash equivalents 119,296,000us-gaap_CashAndCashEquivalentsAtCarryingValue 26,986,000us-gaap_CashAndCashEquivalentsAtCarryingValue 46,293,000us-gaap_CashAndCashEquivalentsAtCarryingValue 63,474,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Amount invested in a single fund 60,300,000amag_AmountInvestedInSingleMoneyMarketFund      
Minimum [Member]        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Amerisource Bergen Drug Corporation [Member]        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 45.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amag_AmerisourceBergenDrugCorporationMember
43.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amag_AmerisourceBergenDrugCorporationMember
   
McKesson Corporation [Member]        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amag_McKessonCorporationMember
29.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amag_McKessonCorporationMember
   
Cardinal Health Inc [Member]        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer   19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amag_CardinalHealthIncMember
   
Cardinal Health Inc [Member] | Maximum        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= amag_CardinalHealthIncMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Amerisource Bergen Drug Corporation [Member]        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 34.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_AmerisourceBergenDrugCorporationMember
41.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_AmerisourceBergenDrugCorporationMember
34.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_AmerisourceBergenDrugCorporationMember
 
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | McKesson Corporation [Member]        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_McKessonCorporationMember
24.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_McKessonCorporationMember
17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_McKessonCorporationMember
 
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Cardinal Health Inc [Member]        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_CardinalHealthIncMember
16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_CardinalHealthIncMember
12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_CardinalHealthIncMember
 
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Takeda Pharmaceutical Company Limited [Member]        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_TakedaPharmaceuticalCompanyLimitedMember
11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_TakedaPharmaceuticalCompanyLimitedMember
31.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_TakedaPharmaceuticalCompanyLimitedMember
 
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Group Purchasing Organization [Member]        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 26.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_GroupPurchasingOrganizationMember
30.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_GroupPurchasingOrganizationMember
32.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_GroupPurchasingOrganizationMember
 
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member]        
Percentage of revenues From customers outside of the U.S.        
Approximate percentage of revenues from customers outside the U.S. 12.00%amag_PercentageOfRevenueFromCustomersOutsideUS
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
11.00%amag_PercentageOfRevenueFromCustomersOutsideUS
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
32.00%amag_PercentageOfRevenueFromCustomersOutsideUS
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember