Document and Entity Information	3 Months Ended
	Mar. 31, 2015	May 01, 2015
Document and Entity Information
Entity Registrant Name	AMAG PHARMACEUTICALS INC.
Entity Central Index Key	0000792977
Document Type	10-Q
Document Period End Date	Mar. 31, 2015
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		30,532,621
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1