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Marketable Securities and Equity Investments (Tables)
 9 Months Ended
Sep. 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 September 30, 2018
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
1,070,166

 
$
—

 
$
—

 
$
1,070,166

U.S. Treasury securities
5,980

 
—

 
(1
)
 
5,979

Government-sponsored enterprise securities
2,498

 
—

 
—

 
2,498

Corporate debt securities
7,573

 
—

 
(1
)
 
7,572

Commercial paper
33,361

 
—

 
(9
)
 
33,352

Total cash equivalents
1,119,578

 
—

 
(11
)
 
1,119,567

Marketable securities:
 
 
 
 
 
 
 
U.S. Treasury securities (matures within 1 year)
6,044

 
—

 
(1
)
 
6,043

Government-sponsored enterprise securities (matures within 1 year)
4,982

 
—

 
—

 
4,982

Government-sponsored enterprise securities (matures after 1 year through 5 years)
1,481

 
—

 
(1
)
 
1,480

Corporate debt securities (matures within 1 year)
179,738

 
5

 
(319
)
 
179,424

Corporate debt securities (matures after 1 year through 5 years)
38,702

 
—

 
(44
)
 
38,658

Commercial paper (matures within 1 year)
140,046

 
—

 
(86
)
 
139,960

Total marketable debt securities
370,993

 
5

 
(451
)
 
370,547

Corporate equity securities
90,133

 
116,903

 
—

 
207,036

Total marketable securities
$
461,126

 
$
116,908

 
$
(451
)
 
$
577,583

 
 
 
 
 
 
 
 
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 September 30, 2018
 
As of December 31, 2017
 
(in thousands)
Cash and cash equivalents
$
1,119,567

 
$
684,986

Marketable securities
370,547

 
348,433

Total
$
1,490,114

 
$
1,033,419