Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Compensation	$ 330	$ 297
Professional fees	456	604
Clinical trial expenses	375	158
Other expenses	579	489
Accrued expenses	$ 1,740	$ 1,548