FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018
Assets [Abstract]
Money market funds	$ 18,041		$ 60,385
Liabilities [Abstract]
Contingent consideration	13,929		13,513
Adjustment to fair value of contingent consideration	400	$ 2,100
Payments of contingent consideration	0	$ 300
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Money market funds	18,041		60,385
Liabilities [Abstract]
Contingent consideration	0		0
Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Money market funds	0		0
Liabilities [Abstract]
Contingent consideration	0		0
Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Money market funds	0		0
Liabilities [Abstract]
Contingent consideration	$ 13,929		$ 13,513