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Marketable Securities and Equity Investments (Tables)
 12 Months Ended
Dec. 31, 2018
Cash and Cash Equivalents [Abstract]  
Summary of cash, 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 December 31, 2018
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
1,226,603

 
$
—

 
$
—

 
$
1,226,603

U.S. Treasury securities
5,967

 
—

 
(1
)
 
5,966

Government-sponsored enterprise securities
7,124

 
—

 
(1
)
 
7,123

Commercial paper
58,271

 
—

 
(3
)
 
58,268

Total cash equivalents
1,297,965

 
—

 
(5
)
 
1,297,960

Marketable securities:
 
 
 
 
 
 
 
U.S Treasury securities (matures within 1 year)
6,026

 
—

 
—

 
6,026

Government-sponsored enterprise securities (matures within 1 year)
10,704

 
—

 
—

 
10,704

Corporate debt securities (matures within 1 year)
232,845

 
25

 
(450
)
 
232,420

Corporate debt securities (matures after 1 year through 5 years)
1,243

 
2

 
—

 
1,245

Commercial paper (matures within 1 year)
100,498

 
—

 
(108
)
 
100,390

Total marketable debt securities
351,316

 
27

 
(558
)
 
350,785

Corporate equity securities
133,157

 
40,619

 
(6,453
)
 
167,323

Total marketable securities
$
484,473

 
$
40,646

 
$
(7,011
)
 
$
518,108

 
 
 
 
 
 
 
 
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 consolidated balance sheets as follows:
 
As of December 31,
 
2018
 
2017
 
(in thousands)
Cash and cash equivalents
$
1,297,960

 
$
684,986

Marketable securities
350,785

 
348,433

Total
$
1,648,745

 
$
1,033,419