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Description of Business	9 Months Ended
Description of Business	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	DESCRIPTION OF BUSINESS AMAG Pharmaceuticals, Inc., a Delaware corporation, was founded in 1981. We are a pharmaceutical company focused on bringing innovative products to patients with unmet medical needs. We do this by leveraging our development and commercial expertise to invest in and grow our pharmaceutical products across a range of therapeutic areas, including women’s health. Our currently marketed products support the health of patients in the areas of maternal and women’s health, anemia management and cancer supportive care, including Makena^® (hydroxyprogesterone caproate injection), Intrarosa^® (prasterone) vaginal inserts, Feraheme^® (ferumoxytol injection) for intravenous (“IV”) use, and MuGard^® Mucoadhesive Oral Wound Rinse. In addition to our marketed products, our portfolio includes two product candidates, Vyleesi™ (bremelanotide), which is being developed for the treatment of hypoactive sexual desire disorder (“HSDD”) in pre-menopausal women and digoxin immune Fab (ovine) (now referred to as AMAG-423), which is being studied for the treatment of severe preeclampsia. Since August 2015, we had provided services related to the preservation of umbilical cord blood stem cell and cord tissue units operated through Cord Blood Registry^® (“CBR”). On August 6, 2018, we completed the sale of our wholly-owned subsidiary, CBR Acquisition Holdings Corp, and the CBR business to GI Chill Acquisition LLC, an affiliate of GI Partners, a private equity investment firm (together “GI”) pursuant to the June 14, 2018 Stock Purchase Agreement (the “CBR Purchase Agreement”) between us and GI. We received $519.3 million in cash at closing and recognized a gain of $89.6 million on the sale during the three and nine months ended September 30, 2018. For additional information, see Note C “Discontinued Operations and Held for Sale”. Throughout this Quarterly Report on Form 10-Q, AMAG Pharmaceuticals, Inc. and our consolidated subsidiaries are collectively referred to as “the Company,” “AMAG,” “we,” “us,” or “our.”