Accrued Expenses - Summary of accrued expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accrued Liabilities, Current [Abstract]
Offering Costs	$ 227	$ 227
Compensation	1,481	1,093
Board of Director Fees	182	120
Miscellaneous Accruals	295	877
Total Accrued Expenses	$ 2,185	$ 2,317