INTANGIBLE ASSETS AND GOODWILL - Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 31, 2018
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