FAIR VALUE MEASUREMENTS - Schedule of Reconciliation of Changes in Fair Value of Level Three Financial Liabilities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Payments	$ 0	$ 841	$ 4,038
Fair value, measurements, recurring | Contingent Purchase Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(4,291)	(5,087)
(Increase) / decrease in fair value and accretion expense (included within research and development expense)	(193)	(45)
Payments		841
Ending balance	(4,484)	(4,291)
Fair value, measurements, recurring | Contingent Contractual Non-compliance Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(49)	(246)
(Increase) / decrease in fair value and accretion expense (included within research and development expense)	49	197
Payments		0
Ending balance	$ 0	$ (49)