Nature of the Business and Basis of Presentation - Nature of Business (Details) $ in Thousands	Jun. 30, 2017 USD ($) tranche	Mar. 31, 2017 USD ($) tranche	Dec. 31, 2016 USD ($)
Nature of Business
Accumulated deficit	$ 208,596		$ 173,879
Minimum time period from the issuance date of the financial statements, Company believes it will be able to fund operations, debt service and capital requirements	12 months
Amended Credit Facility
Nature of Business
Number of tranches | tranche	2	2
Tranche one, capacity available under debt facility contingent on FDA approval and achievement of certain sales levels of DEXTENZA	$ 10,000	$ 10,000
Tranche two, capacity available under debt facility contingent on FDA approval and achievement of certain sales levels of DEXTENZA	$ 10,000	$ 10,000