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Cover
Nov. 16, 2020
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Nov. 16, 2020
Entity File Number 001-10865
Entity Registrant Name AMAG PHARMACEUTICALS, INC.
Entity Central Index Key 0000792977
Entity Tax Identification Number 04-2742593
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 1100 Winter Street
Entity Address, City or Town Waltham
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02451
City Area Code 617
Local Phone Number 498-3300
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.01 per share
Trading Symbol AMAG
Security Exchange Name NASDAQ
Entity Emerging Growth Company false