Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accrued Expenses, Current [Abstract]
Accrued compensation costs	$ 258	$ 129
Other accrued expenses	145	257
Accrued dividends	68	59
Deferred revenue	49	393
Super G Warrant liability	0	165
Accrued expenses and other liabilities	$ 520	$ 1,003