XML 65 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Mar. 02, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-10865    
Entity Registrant Name AMAG PHARMACEUTICALS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 04-2742593    
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    
Title of 12(b) Security Common Stock, par value $0.01 per sharePreferred Share Purchase Rights    
Trading Symbol AMAG    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 335.0
Entity Common Stock, Shares Outstanding (in shares)   34,265,738  
Documents Incorporated by Reference
Portions of the Proxy Statement to be filed in connection with the solicitation of proxies for the Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K.
    
Entity Central Index Key 0000792977    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false