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Current Accrued Expenses - Schedule of Current Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]    
Clinical trial expenses $ 869 $ 1,365
Compensation, excluding taxes 1,124 933
Professional fees 221 286
Short-term portion of lease restructuring 209 216
Other 985 607
Total accrued expenses $ 3,408 $ 3,407