Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments	2
Revenue	$ 2,979	$ 3,159
Gross profit	2,273	2,536
Amortization of intangible assets	187	174
Intangible assets	3,097	3,722
Intersection [Member]
Segment Reporting Information [Line Items]
Revenue	1,892	2,250
Gross profit	1,724	2,069
Amortization of intangible assets	92	92
Intangible assets	1,407	1,651
Highway [Member]
Segment Reporting Information [Line Items]
Revenue	1,087	909
Gross profit	549	467
Amortization of intangible assets	95	82
Intangible assets	$ 1,690	$ 2,071