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Marketable Securities
 12 Months Ended
Dec. 31, 2014
Cash and Cash Equivalents [Abstract]  
Marketable Securities
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)
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

 
 
 
 
 
 
 
 
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


Cash and cash equivalents of $8.4 million related to the Company’s VIE as of December 31, 2014 is recorded on the Company’s consolidated balance sheet in “Prepaid expenses and other current assets,” and is not included in the above table. The Company did not have any VIEs recorded in its consolidated financial statements as of December 31, 2013.
The Company has a limited number of marketable securities in insignificant loss positions as of December 31, 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.
There were no charges recorded for other-than-temporary declines in fair value of marketable securities nor gross realized gains or losses recognized in 2014, 2013 or 2012.