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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%

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