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Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting [Abstract]        
Revenue $ 4,677 $ 4,407 $ 7,915 $ 7,634
Gross profit 3,713 3,551 6,033 6,191
Amortization of intangible assets 0 123 0 245
Intangible assets 2,335 210 2,335 210
Intersection [Member]        
Segment Reporting [Abstract]        
Revenue 2,697 3,189 4,601 5,350
Gross profit 2,534 2,750 4,252 4,828
Intangible assets 2,335   2,335  
Highway [Member]        
Segment Reporting [Abstract]        
Revenue 1,980 1,218 3,314 2,284
Gross profit $ 1,179 801 $ 1,781 1,363
Amortization of intangible assets   123   245
Intangible assets   $ 210   $ 210