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Accrued Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Accrued research and development expenses $ 318 $ 1,903
Accrued employee bonus compensation 730 776
Employee withholdings 22 42
Other accrued expenses 198 428
Total accrued expenses $ 1,268 $ 3,149