REVENUE - Schedule of Sales by Industry (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Revenues	$ 46,747	$ 34,098	$ 129,734	$ 104,665
Commercial [Member]
Disaggregation Of Revenue [Line Items]
Revenues	31,796	20,805	85,458	55,981
Healthcare [Member]
Disaggregation Of Revenue [Line Items]
Revenues	3,638	5,017	15,693	25,680
Government [Member]
Disaggregation Of Revenue [Line Items]
Revenues	3,358	3,149	11,680	11,579
Education [Member]
Disaggregation Of Revenue [Line Items]
Revenues	5,322	3,892	11,430	7,904
License fees from Construction Partners [Member]
Disaggregation Of Revenue [Line Items]
Revenues	193	191	588	539
Total product and transportation revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenues	44,307	33,054	124,849	101,683
Installation and other services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 2,440	$ 1,044	$ 4,885	$ 2,982