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Nature of Business	3 Months Ended
Nature of Business	Mar. 31, 2015
Nature of Business
Nature of Business	1. Nature of Business Collegium Pharmaceutical, Inc. (the ‘‘Company’’) was incorporated in Delaware in April 2002 and then reincorporated in Virginia in July 2014. The Company has its principal operations in Canton, Massachusetts. The Company is a specialty pharmaceutical company developing and planning to commercialize next-generation abuse-deterrent products that incorporate the Company’s patented DETERx® platform technology for the treatment of chronic pain and other diseases. The Company’s lead product candidate, Xtampza ERTM, or Xtampza, is an abuse-deterrent, extended-release, oral formulation of oxycodone, a widely prescribed opioid medication. Xtampza has received Fast Track status from the U.S. Food and Drug Administration (‘‘FDA’’). The Company’s new drug application (‘‘NDA’’) filing for Xtampza was accepted by the FDA on February 10, 2015. The Company’s operations are subject to certain risks and uncertainties. The risks include negative outcome of clinical trials, inability or delay in completing clinical trials or obtaining regulatory approvals, changing market conditions for products being developed by the Company, the need to retain key personnel and protect intellectual property, patent infringement litigation and the availability of additional capital financing on terms acceptable to the Company.