REVENUE - Disaggregation of Revenue by Major Products and Services Lines (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation Of Revenue [Line Items]
Revenues	$ 38,286	$ 29,465
Product [Member]
Disaggregation Of Revenue [Line Items]
Revenues	33,193	25,836
Transportation [Member]
Disaggregation Of Revenue [Line Items]
Revenues	4,061	2,499
License fees from Distribution Partners [Member]
Disaggregation Of Revenue [Line Items]
Revenues	197	207
Total product 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