Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments			2
Revenue	$ 3,750	$ 3,689	$ 10,296	$ 11,286
Gross profit	2,867	3,176	8,179	8,797
Amortization of intangible assets	187	149	549	448
Intangible assets	3,348	3,911	3,348	3,911
Intersection [Member]
Segment Reporting Information [Line Items]
Revenue	2,502	2,789	7,217	7,373
Gross profit	2,228	2,555	6,530	6,586
Amortization of intangible assets	92	92	275	275
Intangible assets	1,468	1,835	1,468	1,835
Highway [Member]
Segment Reporting Information [Line Items]
Revenue	1,248	900	3,079	3,913
Gross profit	639	621	1,649	2,211
Amortization of intangible assets	95	57	274	173
Intangible assets	$ 1,880	$ 2,076	$ 1,880	$ 2,076