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Marketable Securities
 3 Months Ended
Sep. 30, 2013
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 September 30, 2013
 
 
 
 
 
 
 
Cash and cash equivalents:
 
 
 
 
 
 
 
Cash and money market funds
$
580,286

 
$
—

 
$
—

 
$
580,286

Government-sponsored enterprise securities
2,895

 
—

 
—

 
2,895

Total cash and cash equivalents
$
583,181

 
$
—

 
$
—

 
$
583,181

Marketable securities:
 
 
 
 
 
 
 
U.S. Treasury securities (due within 1 year)
$
—

 
$
—

 
$
—

 
$
—

Government-sponsored enterprise securities (due within 1 year)
555,502

 
35

 
(10
)
 
555,527

Commercial paper (due within 1 year)
125,073

 
191

 
—

 
125,264

Corporate debt securities (due within 1 year)
148,672

 
21

 
(38
)
 
148,655

Corporate debt securities (due after 1 year through 5 years)
10,019

 
5

 
(1
)
 
10,023

Total marketable securities
$
839,266

 
$
252

 
$
(49
)
 
$
839,469

Total cash, cash equivalents and marketable securities
$
1,422,447

 
$
252

 
$
(49
)
 
$
1,422,650

 
 
 
 
 
 
 
 
As of December 31, 2012
 
 
 
 
 
 
 
Cash and cash equivalents:
 
 
 
 
 
 
 
Cash and money market funds
$
489,407

 
$
—

 
$
—

 
$
489,407

    Government-sponsored enterprise securities
—

 
—

 
—

 
—

Total cash and cash equivalents
$
489,407

 
$
—

 
$
—

 
$
489,407

Marketable securities:
 
 
 
 
 
 
 
U.S. Treasury securities (due within 1 year)
$
111,350

 
$
2

 
$
(2
)
 
$
111,350

Government-sponsored enterprise securities (due within 1 year)
440,181

 
49

 
(5
)
 
440,225

Commercial paper (due within 1 year)
225,294

 
155

 
—

 
225,449

Corporate debt securities (due within 1 year)
15,429

 
1

 
(1
)
 
15,429

Corporate debt securities (due after 1 year through 5 years)
39,358

 
10

 
(13
)
 
39,355

Total marketable securities
$
831,612

 
$
217

 
$
(21
)
 
$
831,808

Total cash, cash equivalents and marketable securities
$
1,321,019

 
$
217

 
$
(21
)
 
$
1,321,215


Alios’ $51.1 million and $70.0 million, respectively, of cash and money market funds as of September 30, 2013 and December 31, 2012, recorded on the Company’s condensed consolidated balance sheets in “Restricted cash and cash equivalents (Alios),” are not included in the above table.