Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Compensation, including severance	$ 558	$ 229
Professional fees	2,085	619
Clinical trial expenses	107	143
Other expenses	288	228
Accrued expenses	$ 3,038	$ 1,219