Segment Information (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments			2
Revenue	$ 3,387	$ 4,225	$ 6,546	$ 7,597
Gross profit	2,776	3,026	5,312	5,621
Amortization of intangible assets	188	149	362	299
Intangible assets	3,535	3,780	3,535	3,780
Intersection [Member]
Segment Reporting Information [Line Items]
Revenue	2,465	2,512	4,715	4,584
Gross profit	2,233	2,239	4,302	4,031
Amortization of intangible assets	91	91	183	183
Intangible assets	1,559	1,926	1,559	1,926
Highway [Member]
Segment Reporting Information [Line Items]
Revenue	922	1,713	1,831	3,013
Gross profit	543	787	1,010	1,590
Amortization of intangible assets	97	58	179	116
Intangible assets	$ 1,976	$ 1,854	$ 1,976	$ 1,854

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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