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SUBSEQUENT EVENTS	9 Months Ended
SUBSEQUENT EVENTS	Sep. 30, 2014
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS On October 20, 2014, we announced that Michael W. Bonney, Chief Executive Officer of Cubist, plans to retire on December 31, 2014, and has been elected Non-Executive Chairman of the Board of Directors of Cubist effective January 1, 2015. Pursuant to the terms of his separation agreement, we will provide Mr. Bonney with certain termination benefits and payments, including the modification of certain of his equity awards. We are evaluating the financial impact of his separation agreement, and estimate the additional stock-based compensation expense to be recorded in the fourth quarter of 2014 to be approximately $11.0 million.