FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

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

	Amortized		Gross Unrealized		Gross Unrealized		Estimated		Cash and Cash		Short-Term		Long-Term
As of December 31, 2019	Costs		Gain		Loss		Fair Value		Equivalents		Investments		Investments
Cash	$	22,722	$	—	$	—	$	22,722	$	22,722	$	—	$	—
Level 1:
Money market funds	157,401		—		—		157,401		157,401		—		—
Treasury securities	6,498		13		—		6,511		—		—		6,511
Subtotal	186,621		13		—		186,634		180,123		—		6,511
Level 2:
Corporate bonds	36,181		93		—		36,274		—		22,659		13,615
Commercial paper	8,835		1		—		8,836		4,671		4,165		—
Municipal securities	1,345		—		—		1,345		—		1,345		—
Agency bonds	2,099		15		—		2,114		—		2,114		—
Subtotal	48,460		109		—		48,569		4,671		30,283		13,615
Total assets	$	235,081	$	122	$	—	$	235,203	$	184,794	$	30,283	$	20,126

	Amortized		Gross Unrealized		Gross Unrealized			Estimated		Cash and Cash		Short-Term
As of March 31, 2019	Costs		Gain		Loss			Fair Value		Equivalents		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 bonds	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