INVESTMENTS (Tables)

12 Months Ended

Mar. 31, 2018

Available-for-sale and Held-to-maturity Investments

Our investments are classified as either available-for-sale or held-to-maturity. The following table summarizes available-for-sale and held-to-maturity investments as of March 31, 2018 and 2017 (in thousands):

	Available-for-Sale Investments
March 31, 2018	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Loss)			Fair Value
Commercial paper	$	9,263	$	-	$	(12	)	$	9,251
Corporate bonds		66,868		-		(220	)		66,648
Municipal bonds		654		-		(4	)		650
Total available-for-sale investments	$	76,785	$	-	$	(236	)	$	76,549

	Held-to-Maturity Investments
March 31, 2018	Amortized Cost		Gross Unrecognized Gain		Gross Unrecognized (Loss)			Fair Value
Certificates of deposit	$	9,914	$	-	$	(22	)	$	9,892
Corporate bonds		52,938		-		(325	)		52,613
Municipal bonds		345		1		-			346
Total held-to-maturity investments	$	63,197	$	1	$	(347	)	$	62,851

	Available-for-Sale Investments
March 31, 2017	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Loss)			Fair Value
Corporate bonds	$	6,381	$	-	$	(4	)	$	6,377
Municipal bonds		678		-		(16	)		662
Total available-for-sale investments	$	7,059	$	-	$	(20	)	$	7,039

	Held-to-Maturity Investments
March 31, 2017	Amortized Cost		Gross Unrecognized Gain		Gross Unrecognized (Loss)			Fair Value
Certificates of deposit	$	3,735	$	1	$	(1	)	$	3,735
Commercial paper		5,588		-		(3	)		5,585
Corporate bonds		57,009		-		(186	)		56,823
Municipal bonds		361		-		(1	)		360
Total held-to-maturity investments	$	66,693	$	1	$	(191	)	$	66,503

Amortized Cost and Fair Value of Investments, Classified by Stated Maturity

The following table summarizes the amortized cost and fair value of our investments, classified by stated maturity as of March 31, 2018 and 2017 (in thousands):

	March 31, 2018				March 31, 2018
	Available-for-Sale Investments				Held-to-Maturity Investments
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in less than one year	$	70,625	$	70,429	$	50,077	$	49,902
Due in 1 to 3 years		6,160		6,120		13,120		12,949
Total investments	$	76,785	$	76,549	$	63,197	$	62,851

	March 31, 2017				March 31, 2017
	Available-for-Sale Investments				Held-to-Maturity Investments
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in less than one year	$	6,381	$	6,377	$	45,184	$	45,124
Due in 1 to 3 years		678		662		21,509		21,379
Total investments	$	7,059	$	7,039	$	66,693	$	66,503

Gross Unrealized Losses and Fair Values of Investments in Unrealized Loss Position

The following tables present gross unrealized losses and fair values for those investments that were in an unrealized loss position as of March 31, 2018 and 2017, aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position (in thousands):

	As of March 31, 2018
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Certificates of deposit	$	8,899	$	(19	)	$	993	$	(3	)	$	9,892	$	(22	)
Commercial paper		9,251		(12	)		-		-			9,251		(12	)
Corporate bonds		98,173		(395	)		21,088		(150	)		119,261		(545	)
Municipal bonds		-		-			650		(4	)		650		(4	)
Total investments in an unrealized loss position	$	116,323	$	(426	)	$	22,731	$	(157	)	$	139,054	$	(583	)

	As of March 31, 2017
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Certificates of deposit	$	2,738	$	(1	)	$	-	$	-		$	2,738	$	(1	)
Commercial paper		2,989		(3	)		-		-			2,989		(3	)
Corporate bonds		44,387		(177	)		16,108		(13	)		60,495		(190	)
Municipal bonds		1,021		(17	)		-		-			1,021		(17	)
Total investments in an unrealized loss position	$	51,135	$	(198	)	$	16,108	$	(13	)	$	67,243	$	(211	)