OTHER INTANGIBLE ASSETS (Summary of Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 444	$ 607	$ 881
Cost of product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	171	159	158
Cost of product revenue | Patents
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	171	159	158
Operating Expenses
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	273	448	723
Operating Expenses | Patents
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	0	0	0
Operating Expenses | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	133	272	542
Operating Expenses | Developed technology
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	135	156	161
Operating Expenses | Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 5	$ 20	$ 20