Investments (Tables)

12 Months Ended

Mar. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Schedule of Cash, cash equivalents and available-for-sale investments by type of instruments

The following is a summary of cash, cash equivalents and available-for-sale investments by type of instrument (in thousands):

	March 31, 2015									March 31, 2014
	Amortized Cost		Gross Unrealized					Estimated Fair Value		Amortized Cost		Gross Unrealized					Estimated Fair Value
			Gains		Losses							Gains		Losses
Cash	$	33,936	$	—	$	—		$	33,936	$	65,867	$	—	$	—		$	65,867
Cash equivalents	2,559		—		—			2,559		5,672		—		—			5,672
U.S. Treasury securities and agency bonds	1,230		—		—			1,230		2,838		—		—			2,838
Corporate bonds	10,772		28		(6		)	10,794		10,599		30		(2		)	10,627
Mortgage-backed and asset-backed securities*	—		15		—			15		1,793		297		(16		)	2,074
Mutual Funds	24,895		1,955		(59		)	26,791		14,373		2,392		(402		)	16,363
Preferred stock	11		22		—			33		2,406		736		—			3,142
	$	73,403	$	2,020	$	(65	)	$	75,358	$	103,548	$	3,455	$	(420	)	$	106,583
Reported as:
Cash and cash equivalents								$	36,495								$	71,539
Short-term investments available-for-sale								38,863									35,044
								$	75,358								$	106,583

* At March 31, 2015 and 2014, zero and $1.1 million of the estimated fair value presented were mortgage-backed securities, respectively.

Schedule of Cash, cash equivalents and available-for-sale investments by type of instruments measured at fair value on recurring basis

The following is a summary of cash, cash equivalents and available-for-sale investments by type of instruments measured at fair value on a recurring basis (in thousands):

	March 31, 2015								March 31, 2014
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash	$	33,936	$	—	$	—	$	33,936	$	65,867	$	—	$	—	$	65,867
Cash equivalents	2,559		—		—		2,559		5,672		—		—		5,672
U.S. Treasury securities and agency bonds	1,230		—		—		1,230		2,838		—		—		2,838
Corporate bonds	—		10,794		—		10,794		—		10,627		—		10,627
Mortgage-backed and asset-backed securities	—		15		—		15		—		2,074		—		2,074
Mutual funds	26,791		—		—		26,791		16,363		—		—		16,363
Preferred stock	—		33		—		33		—		3,142		—		3,142
	$	64,516	$	10,842	$	—	$	75,358	$	90,740	$	15,843	$	—	$	106,583

Schedule of Cost and estimated fair values of available-for-sale securities with stated maturities by contractual maturity

The following is a summary of the cost and estimated fair values of available-for-sale securities with stated maturities, which include U.S. Treasury securities and agency bonds, corporate bonds and mortgage-backed and asset-backed securities, by contractual maturity (in thousands):

	March 31, 2015
	Cost		Estimated Fair Value
Less than 1 year	$	3,335	$	3,340
Mature in 1 – 2 years	7,965		7,979
Mature in 3 – 5 years	702		706
Mature after 5 years	—		14
	$	12,002	$	12,039

Schedule of Gross unrealized losses

The following is a summary of gross unrealized losses (in thousands):

	Less Than 12 Months of Unrealized Losses					12 Months or More of Unrealized Losses					Total
As of March 31, 2015	Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses
U.S. Treasury securities and agency bonds	$	—	$	—		$	—	$	—		$	—	$	—
Corporate bonds	878		(6		)	—		—			878		(6		)
Mutual funds	14,592		(17		)	475		(42		)	15,067		(59		)
	$	15,470	$	(23	)	$	475	$	(42	)	$	15,945	$	(65	)

	Less Than 12 Months of Unrealized Losses					12 Months or More of Unrealized Losses					Total
As of March 31, 2014	Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses
U.S. Treasury securities and agency bonds	$	—	$	—		$	—	$	—		$	—	$	—
Corporate bonds	992		(2		)	—		—			992		(2		)
Mortgage-backed and asset-backed securities	431		(16		)	—		—			431		(16		)
Mutual funds	4,819		(333		)	405		(69		)	5,224		(402		)
	$	6,242	$	(351	)	$	405	$	(69	)	$	6,647	$	(420	)