Segment Information (Details 3) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total consolidated identifiable assets	$ 27,020	$ 20,364
North America [Member]
Segment Reporting Information [Line Items]
Total consolidated identifiable assets	15,364	13,061
U.K. [Member]
Segment Reporting Information [Line Items]
Total consolidated identifiable assets	9,090	3,508
Other foreign markets [Member]
Segment Reporting Information [Line Items]
Total consolidated identifiable assets	$ 2,566	$ 3,795