GOODWILL AND OTHER INTANGIBLE ASSETS (Summary of Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 227	$ 290	$ 359
Cost of product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	183	175	171
Cost of product revenue | Patents
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	183	175	171
Operating Expenses
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	44	115	188
Operating Expenses | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	27	47	86
Operating Expenses | Developed technology
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	11	68	102
Operating Expenses | Tradename
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 6	$ 0	$ 0