REVENUE Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	$ 19,358	$ 30,548	$ 54,715	$ 101,073
Revenue accounted for under other guidance	930	166	1,039	1,252
Total revenue	20,288	30,714	55,754	102,325
Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	14,469	22,037	40,676	77,008
Revenue accounted for under other guidance	930	166	1,039	1,252
Total revenue	15,399	22,203	41,715	78,260
Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	4,889	8,511	14,039	24,065
Revenue accounted for under other guidance	0	0	0	0
Total revenue	4,889	8,511	14,039	24,065
Lighting product and installation
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	13,222	29,528	41,079	99,369
Lighting product and installation | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	11,543	21,829	36,006	76,704
Lighting product and installation | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	1,679	7,699	5,073	22,665
Maintenance services
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	3,306	1,012	10,806	1,668
Maintenance services | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	772	200	2,516	268
Maintenance services | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	2,534	812	8,290	1,400
Electric vehicle charging
Disaggregation Of Revenue [Line Items]
Total revenue	2,830		2,830
Electric vehicle charging | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenue	2,154		2,154
Electric vehicle charging | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenue	$ 676		$ 676
Solar energy related revenues
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers		8		36
Solar energy related revenues | Product revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers		8		36
Solar energy related revenues | Service revenue
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers		$ 0		$ 0