Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Revenue	$ 5,181	$ 5,938	$ 9,520	$ 10,260
Gross profit	4,204	4,263	7,524	7,380
Amortization of intangible assets	382	393	763	782
Intangible assets, net	3,228	5,763	3,228	5,763
Intersection [Member]
Segment Reporting Information [Line Items]
Revenue	3,189	3,625	5,350	5,808
Gross profit	$ 2,768	$ 3,242	$ 4,828	$ 5,347
Amortization of intangible assets
Highway [Member]
Segment Reporting Information [Line Items]
Revenue	$ 1,218	$ 1,094	$ 2,284	$ 2,169
Gross profit	783	488	1,363	1,166
Amortization of intangible assets	122	121	244	244
Intangible assets, net	210	698	210	698
LPR [Member]
Segment Reporting Information [Line Items]
Revenue	774	1,219	1,886	2,283
Gross profit	653	533	1,333	867
Amortization of intangible assets	260	272	519	538
Intangible assets, net	$ 3,018	$ 5,065	$ 3,018	$ 5,065