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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Payables And Accruals [Abstract]    
Compensation, excluding taxes $ 664 $ 692
Professional fees 183 391
Short-term portion of lease restructuring 214 220
Clinical trial expenses 437 219
Other 537 721
Total accrued expenses $ 2,035 $ 2,243