Segment Information (Financial Information By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenue	$ 7,140	$ 7,741	$ 17,400	$ 19,824
Gross profit	4,583	4,797	11,963	13,313
Amortization of intangible assets	390	328	1,172	1,009
Intangible assets	5,322	6,187	5,322	6,187	6,463
Intersection [Member]
Segment Reporting Information [Line Items]
Revenue	3,194	3,586	9,001	10,293
Gross profit	2,883	3,058	8,230	8,963
Highway [Member]
Segment Reporting Information [Line Items]
Revenue	3,059	2,794	5,229	4,409
Gross profit	1,443	1,238	2,609	1,669
Amortization of intangible assets	122	122	366	367
Intangible assets	576	1,778	576	1,778
LPR [Member]
Segment Reporting Information [Line Items]
Revenue	887	1,361	3,170	5,122
Gross profit	257	501	1,124	2,681
Amortization of intangible assets	268	206	806	642
Intangible assets	$ 4,746	$ 4,409	$ 4,746	$ 4,409