RESTRUCTURING EXPENSE (Restructuring by Statement of Operations Location) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost And Reserve [Line Items]
Total restructuring charges	$ 43	$ 2,146
Cost of product revenue
Restructuring Cost And Reserve [Line Items]
Total restructuring charges		34
General and administrative
Restructuring Cost And Reserve [Line Items]
Total restructuring charges	26	1,822
Sales and marketing
Restructuring Cost And Reserve [Line Items]
Total restructuring charges	$ 17	211
Research and development
Restructuring Cost And Reserve [Line Items]
Total restructuring charges		$ 79