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The Company	9 Months Ended
The Company	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company	The Company Business Momenta Pharmaceuticals, Inc., or the Company or Momenta, was incorporated in the state of Delaware in May 2001 and began operations in early 2002. Its facilities are located in Cambridge, Massachusetts. Momenta is a biotechnology company focused on developing generic versions of complex drugs, biosimilars and novel therapeutics for autoimmune diseases. The Company presently derives all of its revenue from its collaborations.