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Investments (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Securities, Available-for-sale [Abstract]  
Summary of Investments
The following is a summary of our available-for-sale debt securities recorded within short-term and long-term investments on the consolidated balance sheets (in thousands):
 
December 31, 2019
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Available-for-sale securities:
 
 
 
 
 
 
 
Commercial paper
$
101,416

 
$
83

 
$
(9
)
 
$
101,490

Corporate notes and bonds
1,654,166

 
7,360

 
(196
)
 
1,661,330

Certificates of deposit
38,007

 
38

 
—

 
38,045

U.S. government and agency securities
127,544

 
254

 
(14
)
 
127,784

Total available-for-sale securities
$
1,921,133

 
$
7,735

 
$
(219
)
 
$
1,928,649


 
December 31, 2018
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Available-for-sale securities:
 
 
 
 
 
 
 
Commercial paper
$
108,061

 
$
—

 
$
—

 
$
108,061

Corporate notes and bonds
1,233,589

 
343

 
(4,218
)
 
1,229,714

Certificates of deposit
73,584

 
1

 
—

 
73,585

U.S. government and agency securities
102,549

 
23

 
(358
)
 
102,214

Total available-for-sale securities
$
1,517,783

 
$
367

 
$
(4,576
)
 
$
1,513,574
Investments Classified by Contractual Maturity Date The fair values of available-for-sale investment securities, by remaining contractual maturity, are as follows (in thousands):
 
December 31, 2019
Due within 1 year
$
915,317

Due in 1 year through 5 years
1,013,332

Total
$
1,928,649
Fair Values and Gross Unrealized Losses of Available-for-Sale Securities Aggregated by Investment Category
The following table shows the fair values and the gross unrealized losses of these available-for-sale debt securities, classified by the length of time that the securities have been in a continuous unrealized loss position, and aggregated by investment types, excluding those securities classified within cash and cash equivalents on the consolidated balance sheets (in thousands): 
 
December 31, 2019
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
Commercial paper
$
20,752

 
$
(9
)
 
$
—

 
$
—

 
$
20,752

 
$
(9
)
Corporate notes and bonds
242,012

 
(181
)
 
16,264

 
(15
)
 
258,276

 
(196
)
U.S. government and agency securities
17,806

 
(14
)
 
—

 
—

 
17,806

 
(14
)
Total
$
280,570

 
$
(204
)
 
$
16,264

 
$
(15
)
 
$
296,834

 
$
(219
)

 
December 31, 2018
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
Corporate notes and bonds
$
714,605

 
$
(2,603
)
 
$
294,956

 
$
(1,615
)
 
$
1,009,561

 
$
(4,218
)
Certificates of deposit
1,000

 
—

 
—

 
—

 
1,000

 
—

U.S. government and agency securities
11,756

 
(5
)
 
61,457

 
(353
)
 
73,213

 
(358
)
Total
$
727,361

 
$
(2,608
)
 
$
356,413

 
$
(1,968
)
 
$
1,083,774

 
$
(4,576
)