FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities

The following tables present the Company's financial assets and liabilities measured on a recurring basis using the fair value hierarchy at June 30, 2018 and March 31, 2018 (in thousands):

	Fair Value Measurements at
	June 30, 2018
	Level 1		Level 2			Level 3			Total
ASSETS:
Cash and cash equivalents	$	353,416	$	—		$	—		$	353,416
U.S. government and municipal obligations	15,271		30,744			—			46,015
Commercial paper	—		56,877			—			56,877
Corporate bonds	2,745		—			—			2,745
	$	371,432	$	87,621		$	—		$	459,053
LIABILITIES:
Contingent purchase consideration	$	—	$	—		$	(5,502	)	$	(5,502	)
Derivative financial instruments	—		(381		)	—			(381		)
	$	—	$	(381	)	$	(5,502	)	$	(5,883	)

	Fair Value Measurements at
	March 31, 2018
	Level 1		Level 2			Level 3			Total
ASSETS:
Cash and cash equivalents	$	369,821	$	—		$	—		$	369,821
U.S. government and municipal obligations	14,513		27,673			—			42,186
Commercial paper	—		33,003			—			33,003
Corporate bonds	2,752		—			—			2,752
Derivative financial instruments	—		122			—			122
	$	387,086	$	60,798		$	—		$	447,884
LIABILITIES:
Contingent purchase consideration	$	—	$	—		$	(5,464	)	$	(5,464	)
Derivative financial instruments	—		(40		)	—			(40		)
	$	—	$	(40	)	$	(5,464	)	$	(5,504	)

Schedule of Reconciliation of Changes in Fair Value of Level III Financial Assets

The following table sets forth a reconciliation of changes in the fair value of the Company's Level 3 financial assets and liabilities for the three months ended June 30, 2018 (in thousands):

	Contingent Purchase Consideration
Balance at March 31, 2018	$	(5,464	)
Increase in fair value and accretion expense (included within research and development expense)	(38		)
Balance at June 30, 2018	$	(5,502	)