Note Payable and Accrued Expenses - Schedule of Aggregate Future Minimum Payments Due Under Loan and Security Agreement (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Note Payable and Accrued Expenses
2016	$ 333
2017	219
Total minimum payments	552
Less amount representing interest	(80)
Notes payable, gross	472
Unamortized facility fee	(7)
Accrual of final payment	36
Notes payable, balance	501
Less current portion of notes payable	(292)	$ (261)
Non-current portion of notes payable	$ 209	$ 501