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, 2014
Cash and cash equivalents:
Cash and money market funds	$	718,562	$	1	$	—		$	718,563
Total cash and cash equivalents	$	718,562	$	1	$	—		$	718,563
Marketable securities:
Government-sponsored enterprise securities (due within 1 year)	$	467,857	$	27	$	(16	)	$	467,868
Commercial paper (due within 1 year)	46,402		94		—			46,496
Corporate debt securities (due within 1 year)	213,352		2		—			213,354
Corporate debt securities (due after 1 year through 5 years)	31,497		—		(41		)	31,456
Total marketable securities	$	759,108	$	123	$	(57	)	$	759,174
Total cash, cash equivalents and marketable securities	$	1,477,670	$	124	$	(57	)	$	1,477,737

As of December 31, 2013
Cash and cash equivalents:
Cash and money market funds	$	569,299	$	—	$	—		$	569,299
Total cash and cash equivalents	$	569,299	$	—	$	—		$	569,299
Marketable securities:
Government-sponsored enterprise securities (due within 1 year)	$	600,496	$	7	$	(53	)	$	600,450
Commercial paper (due within 1 year)	83,384		109		—			83,493
Corporate debt securities (due within 1 year)	189,674		14		(34		)	189,654
Corporate debt securities (due after 1 year through 5 years)	22,181		6		(7		)	22,180
Total marketable securities	$	895,735	$	136	$	(94	)	$	895,777
Total cash, cash equivalents and marketable securities	$	1,465,034	$	136	$	(94	)	$	1,465,076

The Company has a limited number of marketable securities in insignificant loss positions as of September 30, 2014, 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.