ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Concentrations of Risk, Inventories, Capitalization of Costs of Software for Internal Use, and Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
INVENTORIES [Abstract]
Allowance for obsolescence	$ 259	$ 247
CAPITALIZATION OF COSTS OF SOFTWARE FOR INTERNAL USE [Abstract]
Intangible assets	$ 38,928	26,302
Minimum [Member]
PROPERTY AND EQUIPMENT [Abstract]
Property, plant and equipment, useful life	3 years
Maximum [Member]
PROPERTY AND EQUIPMENT [Abstract]
Property, plant and equipment, useful life	10 years
Information Technology Equipment [Member]
PROPERTY AND EQUIPMENT [Abstract]
Property, plant and equipment, useful life	3 years
Software Licenses [Member]
PROPERTY AND EQUIPMENT [Abstract]
Property, plant and equipment, useful life	5 years
Furniture, Fixtures and Equipment [Member] | Minimum [Member]
PROPERTY AND EQUIPMENT [Abstract]
Property, plant and equipment, useful life	5 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member]
PROPERTY AND EQUIPMENT [Abstract]
Property, plant and equipment, useful life	10 years
Telecommunications Equipment [Member]
PROPERTY AND EQUIPMENT [Abstract]
Property, plant and equipment, useful life	7 years
Software Capitalized for Internal [Member]
CAPITALIZATION OF COSTS OF SOFTWARE FOR INTERNAL USE [Abstract]
Intangible assets	$ 2,500	2,100
Other assets	$ 5,400	$ 3,300
Product Sales [Member] | Customer Concentration Risk [Member] | Cisco Systems [Member]
CONCENTRATIONS OF RISK [Abstract]
Percentage of concentration risk	42.00%	42.00%	47.00%