Marketable Securities

A summary of the Company’s cash, cash equivalents and marketable securities is shown below:



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
As of September 30, 2015
Cash and cash equivalents:
Cash and money market funds	$	707,141	$	—	$	—		$	707,141
Commercial paper	$	25,109	$	—	$	—		$	25,109
Corporate debt securities	$	24,000	$	—	$	—		$	24,000
Total cash and cash equivalents	$	756,250	$	—	$	—		$	756,250
Marketable securities:
Commercial paper (due within 1 year)	$	140,131	$	114	$	—		$	140,245
Corporate debt securities (due within 1 year)	109,386		28		(79		)	109,335
Total marketable securities	$	249,517	$	142	$	(79	)	$	249,580
Total cash, cash equivalents and marketable securities	$	1,005,767	$	142	$	(79	)	$	1,005,830

As of December 31, 2014
Cash and cash equivalents:
Cash and money market funds	$	625,259	$	—	$	—		$	625,259
Total cash and cash equivalents	$	625,259	$	—	$	—		$	625,259
Marketable securities:
Government-sponsored enterprise securities (due within 1 year)	$	463,788	$	14	$	(52	)	$	463,750
Commercial paper (due within 1 year)	51,674		72		—			51,746
Corporate debt securities (due within 1 year)	196,065		2		(66		)	196,001
Corporate debt securities (due after 1 year through 5 years)	50,443		—		(93		)	50,350
Total marketable securities	$	761,970	$	88	$	(211	)	$	761,847
Total cash, cash equivalents and marketable securities	$	1,387,229	$	88	$	(211	)	$	1,387,106

The Company has a limited number of marketable securities in insignificant loss positions as of September 30, 2015, which the Company does not intend to sell and has concluded it will not be required to sell before recovery of the amortized costs for the investment at maturity. There were no charges recorded for other-than-temporary declines in fair value of marketable securities nor gross realized gains or losses recognized in the three and nine months ended September 30, 2015 and 2014.