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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Payables And Accruals [Abstract]    
Compensation, excluding taxes $ 395 $ 692
Professional fees 372 481
Short-term portion of lease restructuring 218 220
Clinical trial expenses 230 219
Other 508 631
Total accrued expenses $ 1,723 $ 2,243