INVESTMENTS (Tables)

9 Months Ended

Dec. 31, 2017

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

The following table summarizes available-for-sale and held-to-maturity investments as of December 31, 2017 and March 31, 2017 (in thousands).

	Available-for-Sale Investments
December 31, 2017	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Loss)			Fair Value
Commercial paper	$	9,960	$	-	$	(6	)	$	9,954
Corporate bonds		45,323		-		(97	)		45,226
Municipal bonds		660		-		(4	)		656
Total available-for-sale investments	$	55,943	$	-	$	(107	)	$	55,836

	Held-to-Maturity Investments
December 31, 2017	Amortized Cost		Gross Unrecognized Gain		Gross Unrecognized (Loss)			Fair Value
Certificates of deposit	$	14,397	$	-	$	(18	)	$	14,379
Corporate bonds		42,467		-		(235	)		42,232
Municipal bonds		350		-		(1	)		349
Total held-to-maturity investments	$	57,214	$	-	$	(254	)	$	56,960

	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 December 31, 2017 and March 31, 2017 (in thousands).

	December 31, 2017				December 31, 2017
	Available-for-Sale Investments				Held-to-Maturity Investments
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in less than one year	$	49,251	$	49,191	$	40,526	$	40,420
Due in 1 to 3 years		6,692		6,645		16,688		16,540
Total investments	$	55,943	$	55,836	$	57,214	$	56,960

	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 December 31, 2017 and March 31, 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 December 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	$	13,133	$	(18	)	$	-	$	-		$	13,133	$	(18	)
Commercial paper		9,954		(6	)		-		-			9,954		(6	)
Corporate bonds		65,280		(217	)		22,178		(115	)		87,458		(332	)
Municipal bonds		656		(4	)		349		(1	)		1,005		(5	)
Total investments in an unrealized loss position	$	89,023	$	(245	)	$	22,527	$	(116	)	$	111,550	$	(361	)

	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	)