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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Payables And Accruals [Abstract]    
Compensation, excluding taxes $ 928 $ 692
Clinical trial expenses 782 219
Professional fees 234 391
Short-term portion of lease restructuring 209 220
Other 548 721
Total accrued expenses $ 2,701 $ 2,243