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Related-Party Transactions	12 Months Ended
Related-Party Transactions	Dec. 31, 2016
Related Party Transactions [Abstract]
Related-Party Transactions	Related-Party Transactions Collaboration In 2015, the Company entered into a research collaboration and license agreement with GrayBug, Inc. (“GrayBug”). The collaboration focused on researching the potential use of Graybug’s biodegradable polymer technology to deliver certain of the Company’s preclinical stage molecules to the back of the eye over a sustained period of time. The Board of Directors of the Company and that of GrayBug have a common Board member. In 2016, the Company terminated its collaboration and license arrangements with GrayBug. The common Board member did not participate in any deliberations associated with this transaction.