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INTANGIBLE ASSETS AND GOODWILL - Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Mar. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 37,212 | $ 31,681
Accumulated Amortization | (23,939) | (19,723)
Net Carrying Amount | 13,273 | 11,958
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 25,702 | 19,702
Accumulated Amortization | (14,099) | (10,535)
Net Carrying Amount | 11,603 | 9,167
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 9,307 | 9,776
Accumulated Amortization | (7,732) | (7,366)
Net Carrying Amount | 1,575 | 2,410
Trade names/domains |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,108 | 2,108
Accumulated Amortization | (2,013) | (1,727)
Net Carrying Amount | 95 | 381
In-process research and development |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 95 | 95
Accumulated Amortization | (95) | (95)
Net Carrying Amount | $ 0 | $ 0

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