Description of Business	12 Months Ended
Dec. 31, 2012
Description of Business
Description of Business	A. Description of Business AMAG Pharmaceuticals, Inc., a Delaware corporation, was founded in 1981. We are a specialty pharmaceutical company focused on the development and commercialization of Feraheme® (ferumoxytol) Injection for Intravenous, or IV, use to treat iron deficiency anemia, or IDA. Currently, our principal source of revenue is from the sale of Feraheme, which was approved for marketing in the U.S. in June 2009 by the U.S. Food and Drug Administration, or the FDA, for use as an IV iron replacement therapy for the treatment of IDA in adult patients with chronic kidney disease, or CKD. We began commercial sale of Feraheme in the U.S. in July 2009 through our own commercial organization, including a specialty sales force. We sell Feraheme to authorized wholesalers and specialty distributors, who in turn, sell Feraheme to healthcare providers who administer Feraheme primarily within hospitals, hematology and oncology centers, and nephrology clinics. Outside of the U.S., ferumoxytol has been granted marketing approval in Canada, Switzerland and the European Union, or EU, for use as an IV iron replacement therapy for the treatment of IDA in adult patients with CKD. The European marketing authorization is valid in the current EU member states as well as in Iceland and Norway. Under our amended agreement with Takeda Pharmaceutical Company Limited, or Takeda, Takeda has an exclusive license to market and sell ferumoxytol in Canada, the EU and Switzerland, as well as certain other geographic territories. In Canada, Takeda promotes ferumoxytol under the trade name Feraheme and in the EU and Switzerland, Takeda promotes ferumoxytol under the trade name Rienso® 30mg/ml solution for Injection. In 2012, we received a total of $33.0 million in milestone payments from Takeda associated with the EU approval and the commercial launches of Feraheme/Rienso in Canada and the EU. In addition, in connection with the commercial launches of Feraheme/Rienso by Takeda, we recorded revenue from product sales to Takeda and royalties on sales by Takeda of $0.1 million in 2012. GastroMARK®, which is marketed and sold under the trade name Lumirem® outside of the U.S, is our oral contrast agent used for delineating the bowel during magnetic resonance imaging and is approved and marketed in the U.S., Europe and other countries through our licensees. In the second quarter of 2012, we terminated our commercial license agreements for GastroMARK. Following the completion of our obligations under these agreements in the first quarter of 2013, we intend to cease commercially manufacturing or selling GastroMARK. Pursuant to the terms of the respective termination agreements, in June 2012, we paid our licensees aggregate termination fees of $1.6 million, which we recorded in selling, general and administrative expenses in our consolidated statement of operations. We are subject to risks common to companies in the pharmaceutical industry including, but not limited to, our sole dependence on the success of Feraheme/Rienso, uncertainties related to the protection of our proprietary technology, our dependence on third parties to manufacture Feraheme/Rienso, the potential development of significant safety or drug interaction problems with respect to Feraheme/Rienso, uncertainty of the regulatory approval process for the broader Feraheme/Rienso indication or for potential alternative manufacturing facilities and processes, uncertainties related to potential collaborations, in-licensing arrangements or acquisition agreements, competition in our industry, uncertainties regarding market acceptance of Feraheme/Rienso, our reliance on a limited number of customers, uncertainties related to patient insurance coverage and third-party reimbursement rates and terms for Feraheme/Rienso, our reliance on Takeda to commercialize Feraheme/Rienso in certain territories outside of the U.S., the potential inability of our third-party manufacturers to operate their facilities in compliance with current good manufacturing practices and manufacture sufficient quantities of Feraheme/Rienso, our or our third-party manufacturers' potential inability to obtain raw or other materials, our potential inability to become profitable in the future, our limited experience commercializing and distributing a pharmaceutical product, our dependence on key personnel, the potential fluctuation of our operating results, uncertainties related to the impact of current and future healthcare initiatives and legislation, potential differences between actual future results and the estimates or assumptions used by us in preparation of our consolidated financial statements, the volatility of our stock price, our potential inadvertent failure to comply with reporting and payment obligations under government pricing programs, our potential inadvertent failure to comply with the regulations of the FDA or other federal, state or foreign government agencies, uncertainties related to the actions of activist stockholders, potential product liability, potential legislative and regulatory changes, and potential costs and liabilities associated with pending or future litigation or patent challenges. Throughout this Annual Report on Form 10-K, AMAG Pharmaceuticals, Inc. and our consolidated subsidiaries are collectively referred to as "the Company," "we," "us," or "our."

A. Description of Business

AMAG Pharmaceuticals, Inc., a Delaware corporation, was founded in 1981. We are a specialty pharmaceutical company focused on the development and commercialization of Feraheme® (ferumoxytol) Injection for Intravenous, or IV, use to treat iron deficiency anemia, or IDA. Currently, our principal source of revenue is from the sale of Feraheme, which was approved for marketing in the U.S. in June 2009 by the U.S. Food and Drug Administration, or the FDA, for use as an IV iron replacement therapy for the treatment of IDA in adult patients with chronic kidney disease, or CKD. We began commercial sale of Feraheme in the U.S. in July 2009 through our own commercial organization, including a specialty sales force. We sell Feraheme to authorized wholesalers and specialty distributors, who in turn, sell Feraheme to healthcare providers who administer Feraheme primarily within hospitals, hematology and oncology centers, and nephrology clinics.

Outside of the U.S., ferumoxytol has been granted marketing approval in Canada, Switzerland and the European Union, or EU, for use as an IV iron replacement therapy for the treatment of IDA in adult patients with CKD. The European marketing authorization is valid in the current EU member states as well as in Iceland and Norway. Under our amended agreement with Takeda Pharmaceutical Company Limited, or Takeda, Takeda has an exclusive license to market and sell ferumoxytol in Canada, the EU and Switzerland, as well as certain other geographic territories. In Canada, Takeda promotes ferumoxytol under the trade name Feraheme and in the EU and Switzerland, Takeda promotes ferumoxytol under the trade name Rienso® 30mg/ml solution for Injection. In 2012, we received a total of $33.0 million in milestone payments from Takeda associated with the EU approval and the commercial launches of Feraheme/Rienso in Canada and the EU. In addition, in connection with the commercial launches of Feraheme/Rienso by Takeda, we recorded revenue from product sales to Takeda and royalties on sales by Takeda of $0.1 million in 2012.

GastroMARK®, which is marketed and sold under the trade name Lumirem® outside of the U.S, is our oral contrast agent used for delineating the bowel during magnetic resonance imaging and is approved and marketed in the U.S., Europe and other countries through our licensees. In the second quarter of 2012, we terminated our commercial license agreements for GastroMARK. Following the completion of our obligations under these agreements in the first quarter of 2013, we intend to cease commercially manufacturing or selling GastroMARK. Pursuant to the terms of the respective termination agreements, in June 2012, we paid our licensees aggregate termination fees of $1.6 million, which we recorded in selling, general and administrative expenses in our consolidated statement of operations.

We are subject to risks common to companies in the pharmaceutical industry including, but not limited to, our sole dependence on the success of Feraheme/Rienso, uncertainties related to the protection of our proprietary technology, our dependence on third parties to manufacture Feraheme/Rienso, the potential development of significant safety or drug interaction problems with respect to Feraheme/Rienso, uncertainty of the regulatory approval process for the broader Feraheme/Rienso indication or for potential alternative manufacturing facilities and processes, uncertainties related to potential collaborations, in-licensing arrangements or acquisition agreements, competition in our industry, uncertainties regarding market acceptance of Feraheme/Rienso, our reliance on a limited number of customers, uncertainties related to patient insurance coverage and third-party reimbursement rates and terms for Feraheme/Rienso, our reliance on Takeda to commercialize Feraheme/Rienso in certain territories outside of the U.S., the potential inability of our third-party manufacturers to operate their facilities in compliance with current good manufacturing practices and manufacture sufficient quantities of Feraheme/Rienso, our or our third-party manufacturers' potential inability to obtain raw or other materials, our potential inability to become profitable in the future, our limited experience commercializing and distributing a pharmaceutical product, our dependence on key personnel, the potential fluctuation of our operating results, uncertainties related to the impact of current and future healthcare initiatives and legislation, potential differences between actual future results and the estimates or assumptions used by us in preparation of our consolidated financial statements, the volatility of our stock price, our potential inadvertent failure to comply with reporting and payment obligations under government pricing programs, our potential inadvertent failure to comply with the regulations of the FDA or other federal, state or foreign government agencies, uncertainties related to the actions of activist stockholders, potential product liability, potential legislative and regulatory changes, and potential costs and liabilities associated with pending or future litigation or patent challenges.

Throughout this Annual Report on Form 10-K, AMAG Pharmaceuticals, Inc. and our consolidated subsidiaries are collectively referred to as "the Company," "we," "us," or "our."