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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On August 4, 2015, the Company and GrayBug, Inc. (“GrayBug”) entered into a research collaboration and license agreement to deliver certain of the Company’s preclinical stage product candidates to both the front and back of the eye using GrayBug’s proprietary technology. The Board of Directors of the Company and that of GrayBug have a common Board member.