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Marketable Securities
 9 Months Ended
Sep. 30, 2017
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, 2017
 
 
 
 
 
 
 
Cash and cash equivalents:
 
 
 
 
 
 
 
Cash and money market funds
$
1,350,891

 
$
—

 
$
—

 
$
1,350,891

Government-sponsored enterprise securities
14,979

 
—

 
—

 
14,979

Commercial paper
14,610

 
—

 
(2
)
 
14,608

Corporate debt securities
4,488

 
—

 
—

 
4,488

Total cash and cash equivalents
$
1,384,968

 
$
—

 
$
(2
)
 
$
1,384,966

Marketable securities:
 
 
 
 
 
 
 
Corporate equity securities
43,213

 
13,731

 
—

 
56,944

Commercial paper (matures within 1 year)
75,186

 
1

 
(20
)
 
75,167

Corporate debt securities (matures within 1 year)
235,679

 
8

 
(106
)
 
235,581

Corporate debt securities (matures after 1 year)
59,651

 
—

 
(61
)
 
59,590

Total marketable securities
$
413,729

 
$
13,740

 
$
(187
)
 
$
427,282

Total cash, cash equivalents and marketable securities
$
1,798,697

 
$
13,740

 
$
(189
)
 
$
1,812,248

 
 
 
 
 
 
 
 
As of December 31, 2016
 
 
 
 
 
 
 
Cash and cash equivalents:
 
 
 
 
 
 
 
Cash and money market funds
$
1,183,945

 
$
—

 
$
—

 
$
1,183,945

Total cash and cash equivalents
$
1,183,945

 
$
—

 
$
—

 
$
1,183,945

Marketable securities:
 
 
 
 
 
 
 
Government-sponsored enterprise securities (matures within 1 year)
$
15,506

 
$
2

 
$
—

 
$
15,508

Corporate equity securities
43,213

 
21,347

 
—

 
64,560

Commercial paper (matures within 1 year)
59,331

 
73

 
—

 
59,404

Corporate debt securities (matures within 1 year)
111,225

 
—

 
(85
)
 
111,140

Total marketable securities
$
229,275

 
$
21,422

 
$
(85
)
 
$
250,612

Total cash, cash equivalents and marketable securities
$
1,413,220

 
$
21,422

 
$
(85
)
 
$
1,434,557


The Company has a limited number of marketable securities in insignificant loss positions as of September 30, 2017, which the Company does not intend to sell and has concluded it will not be required to sell before recovery of the amortized costs of 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, 2017 and 2016.