REVENUE Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	$ 25,952	$ 19,358	$ 64,127	$ 54,715
Revenue accounted for under other guidance	19	930	43	1,039
Total revenue	25,971	20,288	64,170	55,754
Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	16,988	14,469	46,223	40,676
Revenue accounted for under other guidance	19	930	43	1,039
Total revenue	17,007	15,399	46,266	41,715
Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	8,964	4,889	17,904	14,039
Revenue accounted for under other guidance	0	0	0	0
Total revenue	8,964	4,889	17,904	14,039
Lighting product and installation
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	18,518	13,222	44,676	41,079
Lighting product and installation | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	13,773	11,543	37,486	36,006
Lighting product and installation | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	4,745	1,679	7,190	5,073
Maintenance Services
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	4,609	3,306	11,996	10,806
Maintenance Services | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	1,080	772	2,855	2,516
Maintenance Services | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	3,529	2,534	9,141	8,290
Electric vehicle charging
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	2,818	2,830	7,435	2,830
Electric vehicle charging | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	2,128	2,154	5,862	2,154
Electric vehicle charging | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	690	$ 676	1,573	$ 676
Solar energy related revenues
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	7		20
Solar energy related revenues | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	7		20
Solar energy related revenues | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	$ 0		$ 0