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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]    
Compensation, excluding taxes $ 418 $ 933
Clinical trial expenses 1,867 1,365
Professional fees 256 286
Short-term portion of lease restructuring 222 216
Other 785 607
Total accrued expenses $ 3,548 $ 3,407