REVENUE - Schedule of Sales by Industry (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation Of Revenue [Line Items]
Revenues	$ 38,286	$ 29,465
Commercial [Member]
Disaggregation Of Revenue [Line Items]
Revenues	24,044	16,144
Healthcare [Member]
Disaggregation Of Revenue [Line Items]
Revenues	6,964	6,487
Government [Member]
Disaggregation Of Revenue [Line Items]
Revenues	3,281	4,181
Education [Member]
Disaggregation Of Revenue [Line Items]
Revenues	2,965	1,523
License Fees from Distribution Partners [Member]
Disaggregation Of Revenue [Line Items]
Revenues	197	207
Total product and transportation revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenues	37,451	28,542
Installation and other services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 835	$ 923