REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	$ 19,415	$ 25,952	$ 58,424	$ 64,127
Revenue accounted for under other guidance	169	19	427	43
Total revenue	19,584	25,971	58,851	64,170
Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	14,139	16,988	39,015	46,223
Revenue accounted for under other guidance	169	19	427	43
Total revenue	14,308	17,007	39,442	46,266
Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	5,276	8,964	19,409	17,904
Revenue accounted for under other guidance	0	0	0	0
Total revenue	5,276	8,964	19,409	17,904
Lighting product and installation
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	13,045	18,518	36,361	44,676
Lighting product and installation | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	11,291	13,773	30,636	37,486
Lighting product and installation | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	1,754	4,745	5,725	7,190
Maintenance services
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	3,925	4,609	11,045	11,996
Maintenance services | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	1,672	1,080	3,795	2,855
Maintenance services | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	2,253	3,529	7,250	9,141
Electric vehicle charging
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	2,445	2,818	11,001	7,435
Electric vehicle charging | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	1,176	2,128	4,567	5,862
Electric vehicle charging | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	1,269	690	6,434	1,573
Solar energy related revenues
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	0	7	17	20
Solar energy related revenues | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	0	7	17	20
Solar energy related revenues | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	$ 0	$ 0	$ 0	$ 0