FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018
Assets [Abstract]
Money market funds	$ 25,116		$ 25,116		$ 60,385
Liabilities [Abstract]
Contingent consideration	13,496		13,496		13,513
Adjustment to fair value of contingent consideration	700	$ 10,300	1,100	$ 12,400
Payments of contingent consideration	1,100		1,100	$ 300
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Money market funds	25,116		25,116		60,385
Liabilities [Abstract]
Contingent consideration	0		0		0
Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Money market funds	0		0		0
Liabilities [Abstract]
Contingent consideration	0		0		0
Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Money market funds	0		0		0
Liabilities [Abstract]
Contingent consideration	$ 13,496		$ 13,496		$ 13,513