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Marketable Securities and Equity Investments (Tables)
 6 Months Ended
Jun. 30, 2018
Cash and Cash Equivalents [Abstract]  
Summary of cash equivalents and marketable securities
A summary of the Company’s cash equivalents and marketable securities is shown below:
 
Amortized Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
(in thousands)
As of June 30, 2018
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
971,044

 
$
—

 
$
—

 
$
971,044

Government-sponsored enterprise securities
10,981

 
1

 
—

 
10,982

Commercial paper
21,270

 
—

 
(7
)
 
21,263

Total cash equivalents
1,003,295

 
1

 
(7
)
 
1,003,289

Marketable securities:
 
 
 
 
 
 
 
U.S. Treasury securities (matures within 1 year)
11,022

 
—

 
(2
)
 
11,020

Government-sponsored enterprise securities (matures within 1 year)
2,491

 
—

 
—

 
2,491

Corporate debt securities (matures within 1 year)
178,692

 
—

 
(564
)
 
178,128

Corporate debt securities (matures after 1 year through 5 years)
54,613

 
1

 
(38
)
 
54,576

Commercial paper (matures within 1 year)
133,478

 
4

 
(76
)
 
133,406

Total marketable debt securities
380,296

 
5

 
(680
)
 
379,621

Corporate equity securities
64,713

 
178,062

 
—

 
242,775

Total marketable securities
$
445,009

 
$
178,067

 
$
(680
)
 
$
622,396

 
 
 
 
 
 
 
 
As of December 31, 2017
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
614,951

 
$
—

 
$
—

 
$
614,951

Government-sponsored enterprise securities
12,679

 
—

 
(1
)
 
12,678

Commercial paper
57,371

 
—

 
(14
)
 
57,357

Total cash equivalents
685,001

 
—

 
(15
)
 
684,986

Marketable securities:
 
 
 
 
 
 
 
Government-sponsored enterprise securities (matures within 1 year)
2,304

 
—

 
(1
)
 
2,303

Corporate debt securities (matures within 1 year)
215,639

 
—

 
(363
)
 
215,276

Corporate debt securities (matures after 1 year through 5 years)
50,697

 
—

 
(106
)
 
50,591

Commercial paper (matures within 1 year)
80,372

 
—

 
(109
)
 
80,263

Total marketable debt securities
349,012

 
—

 
(579
)
 
348,433

Available-for-sale corporate equity securities
43,213

 
31,608

 
—

 
74,821

Total marketable securities
$
392,225

 
$
31,608

 
$
(579
)
 
$
423,254


Available-for-sale debt securities were recorded in the Company's condensed consolidated balance sheets as follows:
 
As of June 30, 2018
 
As of December 31, 2017
 
(in thousands)
Cash and cash equivalents
$
1,003,289

 
$
684,986

Marketable securities
379,621

 
348,433

Total
$
1,382,910

 
$
1,033,419