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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]    
Clinical trial expenses $ 1,410 $ 1,365
Compensation, excluding taxes 1,132 933
Professional fees 448 286
Short-term portion of lease restructuring 221 216
Other 544 607
Total accrued expenses $ 3,755 $ 3,407