XML 40 R30.htm IDEA: XBRL DOCUMENT v3.8.0.1
Marketable Securities and Equity Investments (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2018
 
 
 
 
 
 
 
Available-for-sale debt securities
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
921,007

 
$
—

 
$
—

 
$
921,007

Government-sponsored enterprise securities
4,990

 
—

 
(1
)
 
4,989

Corporate debt securities
7,930

 
—

 
(3
)
 
7,927

Commercial paper
50,680

 
—

 
(11
)
 
50,669

Total cash equivalents
984,607

 
—

 
(15
)
 
984,592

Marketable securities:
 
 
 
 
 
 
 
Government-sponsored enterprise securities (matures within 1 year)
4,995

 
—

 
—

 
4,995

Corporate debt securities (matures within 1 year)
184,698

 
—

 
(648
)
 
184,050

Corporate debt securities (matures after 1 year through 5 years)
34,383

 
—

 
(220
)
 
34,163

Commercial paper (matures within 1 year)
69,230

 
—

 
(171
)
 
69,059

Total marketable debt securities
293,306

 
—

 
(1,039
)
 
292,267

Total available-for-sale debt securities
1,277,913

 
—

 
(1,054
)
 
1,276,859

Corporate equity securities
64,713

 
124,144

 
—

 
188,857

Total cash equivalents and marketable securities
$
1,342,626

 
$
124,144

 
$
(1,054
)
 
$
1,465,716

 
 
 
 
 
 
 
 
As of December 31, 2017
 
 
 
 
 
 
 
Available-for-sale debt securities
 
 
 
 
 
 
 
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

Total available-for-sale debt securities
1,034,013

 
—

 
(594
)
 
1,033,419

Available-for-sale corporate equity securities
43,213

 
31,608

 
—

 
74,821

Total cash equivalents and marketable securities
$
1,077,226

 
$
31,608

 
$
(594
)
 
$
1,108,240