REVENUE - Schedule of Sales by Industry (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
Commercial [Member]
Disaggregation Of Revenue [Line Items]
Revenues	29,618	19,032	53,662	35,176
Healthcare [Member]
Disaggregation Of Revenue [Line Items]
Revenues	5,091	14,176	12,055	20,663
Government [Member]
Disaggregation Of Revenue [Line Items]
Revenues	5,041	4,249	8,322	8,430
Education [Member]
Disaggregation Of Revenue [Line Items]
Revenues	3,143	2,489	6,108	4,012
License fees from Construction Partners [Member]
Disaggregation Of Revenue [Line Items]
Revenues	198	141	395	348
Total product and transportation 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