FAIR VALUE MEASUREMENTS - Schedule of Reconciliation of Changes in Fair Value of Level III Financial Assets (Details) - Fair value, measurements, recurring - Contingent Purchase Consideration $ in Thousands	3 Months Ended
	Jun. 30, 2015 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ (4,484)
Increase in fair value and accretion expense (included within research and development expense)	(37)
Balance at end of period	$ (4,521)