Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 455	$ 398
Accumulated depreciation	(310)	(242)
Property and equipment, net	145	156
Furniture, fixtures and office equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	164	144
Software and technology assets [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 291	$ 254