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Marketable Securities
 3 Months Ended
Mar. 31, 2016
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)
As of March 31, 2016
 
 
 
 
 
 
 
Cash and cash equivalents:
 
 
 
 
 
 
 
Cash and money market funds
$
590,688

 
$
—

 
$
—

 
$
590,688

Corporate debt securities
13,557

 
—

 
—

 
13,557

Total cash and cash equivalents
$
604,245

 
$
—

 
$
—

 
$
604,245

Marketable securities:
 
 
 
 
 
 
 
U.S. Treasury securities (due within 1 year)
$
33,108

 
$
—

 
$
(4
)
 
$
33,104

Government-sponsored enterprise securities (due within 1 year)
126,461

 
17

 
—

 
126,478

Commercial paper (due within 1 year)
141,243

 
319

 
—

 
141,562

Corporate debt securities (due within 1 year)
120,206

 
23

 
—

 
120,229

Total marketable securities
$
421,018

 
$
359

 
$
(4
)
 
$
421,373

Total cash, cash equivalents and marketable securities
$
1,025,263

 
$
359

 
$
(4
)
 
$
1,025,618

 
 
 
 
 
 
 
 
As of December 31, 2015
 
 
 
 
 
 
 
Cash and cash equivalents:
 
 
 
 
 
 
 
Cash and money market funds
$
582,352

 
$
—

 
$
—

 
$
582,352

Government-sponsored enterprise securities
85,994

 
—

 
—

 
85,994

Commercial paper
34,889

 
—

 
—

 
34,889

Corporate debt securities
11,533

 
—

 
—

 
11,533

Total cash and cash equivalents
$
714,768

 
$
—

 
$
—

 
$
714,768

Marketable securities:
 
 
 
 
 
 
 
Government-sponsored enterprise securities (due within 1 year)
$
87,176

 
$
—

 
$
(14
)
 
$
87,162

Commercial paper (due within 1 year)
98,877

 
246

 
—

 
99,123

Corporate debt securities (due within 1 year)
141,515

 
—

 
(106
)
 
141,409

Total marketable securities
$
327,568

 
$
246

 
$
(120
)
 
$
327,694

Total cash, cash equivalents and marketable securities
$
1,042,336

 
$
246

 
$
(120
)
 
$
1,042,462


The Company has a limited number of marketable securities in insignificant loss positions as of March 31, 2016, 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 months ended March 31, 2016 and 2015.