REVENUE - Disaggregation of Revenue by Major Products and Services Lines (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation Of Revenue [Line Items]
Revenues	$ 44,701	$ 41,102	$ 82,987	$ 70,567
Product [Member]
Disaggregation Of Revenue [Line Items]
Revenues	38,098	36,462	71,291	62,298
Transportation [Member]
Disaggregation Of Revenue [Line Items]
Revenues	4,795	3,484	8,856	5,983
License fees from Construction Partners [Member]
Disaggregation Of Revenue [Line Items]
Revenues	198	141	395	348
Total product revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenues	43,091	40,087	80,542	68,629
Installation and other services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 1,610	$ 1,015	$ 2,445	$ 1,938