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Investments
 9 Months Ended
Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Investments Investments
Our investments consisted of the following (in thousands):
 
As of September 30, 2019
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Certificates of deposit
$
3,881

 
$
27

 
$
—

 
$
3,908

Corporate notes and bonds
473,473

 
1,949

 
(316
)
 
475,106

U.S. Treasuries
64,273

 
18

 
(48
)
 
64,243

U.S. Government agencies
156,664

 
7

 
(111
)
 
156,560

Total
$
698,291


$
2,001


$
(475
)

$
699,817


 
As of December 31, 2018
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Corporate notes and bonds
$
450,097

 
$
44

 
$
(1,818
)
 
$
448,323

U.S. Treasuries
112,783

 
2

 
(85
)
 
112,700

U.S. Government agencies
146,110

 
—

 
(442
)
 
145,668

Total
$
708,990

 
$
46

 
$
(2,345
)

$
706,691


The following tables present the gross unrealized losses and related fair values of our investments that have been in a continuous unrealized loss position (in thousands):
 
As of September 30, 2019
 
Less Than 12 Months
 
Greater Than 12 Months
 
Total
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
Corporate notes and bonds
$
117,902

 
$
(300
)
 
$
51,197

 
$
(16
)
 
$
169,099

 
$
(316
)
U.S. Treasuries
—

 
—

 
33,972

 
(48
)
 
33,972

 
(48
)
U.S. Government agencies
91,497

 
(93
)
 
43,740

 
(18
)
 
135,237

 
(111
)
Total
$
209,399


$
(393
)

$
128,909


$
(82
)

$
338,308


$
(475
)

 
As of December 31, 2018
 
Less Than 12 Months
 
Greater Than 12 Months
 
Total
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
Corporate notes and bonds
$
420,548

 
$
(1,817
)
 
$
1,526

 
$
(2
)
 
$
422,074

 
$
(1,819
)
U.S. Treasuries
105,525

 
(85
)
 
—

 
—

 
105,525

 
(85
)
U.S. Government agencies
137,416

 
(441
)
 
—

 
—

 
137,416

 
(441
)
Total
$
663,489


$
(2,343
)

$
1,526


$
(2
)

$
665,015


$
(2,345
)

Unrealized losses related to these investments are due to interest rate fluctuations as opposed to credit quality. In addition, we do not intend to sell, and it is not more likely than not that we would be required to sell, these investments before recovery of their cost basis. As a result, there is no other-than-temporary impairment for these investments as of September 30, 2019 and December 31, 2018.
The following table summarizes the contractual maturities of our investments at September 30, 2019 (in thousands):
 
Amortized Cost
 
Fair Value
Due within one year
$
328,664

 
$
328,862

Due within one to three years
369,627

 
370,955

Total
$
698,291

 
$
699,817


All available-for-sale securities have been classified as current, based on management's ability to use the funds in current operations.
As of September 30, 2019, we held a 10.0% ownership interest in a private company, which is accounted for under the equity method based on our ability to exercise significant influence over operating and financial policies of the private company. This investment is classified within deposits and other long-term assets on our condensed consolidated balance sheets. The carrying value of this investment was zero as of September 30, 2019 and $0.5 million as of December 31, 2018.