FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring

Contractual maturities of investments as of March 31, 2019 are set forth below (in thousands):

	Estimated Fair Value
Due within one year	$	32,385
Due after one year	37,514
Total	$	69,899

Cash, cash equivalents and available-for-sale investments were (in thousands):

As of March 31, 2019	Amortized Costs		Gross Unrealized Gain		Gross Unrealized Loss			Estimated Fair Value		Cash and Cash Equivalents		Short-Term Investments
Cash	$	25,364	$	—	$	—		$	25,364	$	25,364	$	—
Level 1:
Money market funds	251,219		—		—			251,219		251,219		—
Subtotal	276,583		—		—			276,583		276,583		—
Level 2:
Corporate debt	46,516		51		(29		)	46,538		—		46,538
Municipal securities	5,511		17		—			5,528		—		5,528
Asset backed securities	13,596		9		(17		)	13,588		—		13,588
Agency bond	4,260		—		(15		)	4,245		—		4,245
Subtotal	69,883		77		(61		)	69,899		—		69,899
Total assets	$	346,466	$	77	$	(61	)	$	346,482	$	276,583	$	69,899

As of March 31, 2018	Amortized Costs		Gross Unrealized Gain		Gross Unrealized Loss			Estimated Fair Value		Cash and Cash Equivalents		Short-Term Investments
Cash	$	16,499	$	—	$	—		$	16,499	$	16,499	$	—
Level 1:
Money market funds	15,204		—		—			15,204		15,204		—
Subtotal	31,703		—		—			31,703		31,703		—
Level 2:
Commercial paper	13,254		—		(8		)	13,246		—		13,246
Corporate debt	70,631		6		(296		)	70,341		—		70,341
Asset backed securities	3,385		3		(1		)	3,387		—		3,387
Mortgage backed securities	27,063		1		(119		)	26,945		—		26,945
Agency bond	4,183		—		(35		)	4,148		—		4,148
Subtotal	121,013		10		(464		)	120,559		—		120,559
Total assets	$	152,716	$	10	$	(464	)	$	152,262	$	31,703	$	120,559