Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accrued professional fees	$ 526	$ 824
Accrued compensation	631	755
Accrued other	394	200
Total accrued expenses	$ 1,551	$ 1,779