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Basis of Presentation and Summary of Significant Accounting Policies (Details 2) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Investment Concentration Risk        
Cash, cash equivalents and investments 361,100,000us-gaap_InvestmentsAndCash      
Investment in institutional money market funds 193,900,000us-gaap_MoneyMarketFundsAtCarryingValue      
Cash and cash equivalents 243,801,000us-gaap_CashAndCashEquivalentsAtCarryingValue 200,916,000us-gaap_CashAndCashEquivalentsAtCarryingValue 119,296,000us-gaap_CashAndCashEquivalentsAtCarryingValue 26,986,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Amount invested in a single fund 190,800,000amag_AmountInvestedInSingleMoneyMarketFund      
Sales Revenue, Net | Customer Concentration Risk | Amerisource Bergen Drug Corporation        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 30.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_AmerisourceBergenDrugCorporationMember
39.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_AmerisourceBergenDrugCorporationMember
   
Sales Revenue, Net | Customer Concentration Risk | Takeda Pharmaceutical Company Limited        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 13.00%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
   
Sales Revenue, Net | Customer Concentration Risk | McKesson Corporation        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_McKessonCorporationMember
22.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_McKessonCorporationMember
   
Sales Revenue, Net | Customer Concentration Risk | Cardinal Health Inc        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_CardinalHealthIncMember
15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_CardinalHealthIncMember
   
Sales Revenue, Net | Customer Concentration Risk | Group Purchasing Organization        
Customers representing 10% or more of revenues        
Percentage of revenues from major customer 23.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_GroupPurchasingOrganizationMember
28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amag_GroupPurchasingOrganizationMember
   
Sales Revenue, Net | Geographic Concentration Risk        
Percentage of revenues From customers outside of the U.S.        
Approximate percentage of revenues from customers outside the U.S. 13.00%amag_PercentageOfRevenueFromCustomersOutsideUS
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
16.00%amag_PercentageOfRevenueFromCustomersOutsideUS
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember