Property and Equipment (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Depreciation expense	$ 68,000	$ 56,000
Furniture, fixtures and office equipment [Member]
Property Plant And Equipment [Line Items]
Estimated service life	5 years
Software and technology assets [Member]
Property Plant And Equipment [Line Items]
Estimated service life	3 years