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Current Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Payables And Accruals [Abstract]    
Clinical trial expenses $ 1,365 $ 692
Compensation, excluding taxes 933 391
Professional fees 286 220
Short-term portion of lease restructuring 216 219
Other 607 721
Total accrued expenses $ 3,407 $ 2,243