The following tables summarize the Company’s cash and available-for-sale securities’ adjusted cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category recorded as cash and cash equivalents, short-term, or long-term investments as of December 31, 2015 and March 31, 2015 (in thousands):



December 31, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash & Cash Equivalents		Short-term investments (due in 1 year or less)		Long-term investments (due in 1 to 3 years)
Cash	$	209,379	$	—	$	—		$	209,379	$	209,379	$	—	$	—
Level 1:
Mutual Funds	9,497		1		(546		)	8,952		—		8,952		—
US Treasury Notes	39,822		—		(96		)	39,726		4,006		16,000		19,720
Subtotal	49,319		1		(642		)	48,678		4,006		24,952		19,720
Level 2:
Government Agency Securities	70,680		1		(178		)	70,503		—		20,919		49,584
Commercial Paper	40,196		—		—			40,196		4,199		35,702		295
Corporate Bonds	143,139		22		(375		)	142,786		—		77,221		65,565
Certificates of Deposits ("CDs")	8,970		—		—			8,970		1,507		7,463		—
Subtotal	262,985		23		(553		)	262,455		5,706		141,305		115,444

Total cash, cash equivalents and investments measured at fair value	$	521,683	$	24	$	(1,195	)	$	520,512	$	219,091	$	166,257	$	135,164



March 31, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash & Cash Equivalents		Short-term investments (due in 1 year or less)		Long-term investments (due in 1 to 3 years)
Cash	$	273,350	$	—	$	—		$	273,350	$	273,350	$	—	$	—
Level 1:
Mutual Funds	5,398		147		(25		)	5,520		—		5,520		—
Level 2:
Government Agency Securities	89,875		37		(22		)	89,890		—		43,024		46,866
Commercial Paper	17,574		10		—			17,584		3,500		14,084		—
Corporate Bonds	95,759		199		(3		)	95,955		—		35,231		60,724
Subtotal	203,208		246		(25		)	203,429		3,500		92,339		107,590

Total cash, cash equivalents and investments measured at fair value	$	481,956	$	393	$	(50	)	$	482,299	$	276,850	$	97,859	$	107,590