Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments			2
Revenue	$ 3,272	$ 3,750	$ 10,039	$ 10,296
Gross profit	2,687	2,867	7,921	8,179
Amortization of intangible assets	200	187	579	549
Intangible assets	2,759	3,348	2,759	3,348
Intersection [Member]
Segment Reporting Information [Line Items]
Revenue	2,677	2,502	7,206	7,217
Gross profit	2,456	2,228	6,617	6,530
Amortization of intangible assets	105	92	293	275
Intangible assets	1,260	1,468	1,260	1,468
Highway [Member]
Segment Reporting Information [Line Items]
Revenue	595	1,248	2,833	3,079
Gross profit	231	639	1,304	1,649
Amortization of intangible assets	95	95	286	274
Intangible assets	$ 1,499	$ 1,880	$ 1,499	$ 1,880