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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Debt Securities
The following tables summarize the Company's investments in available-for-sale debt securities:
 
 
Amortized
 
Unrealized
 
Fair
As of June 30, 2018
 
Cost Basis
 
Gains
 
Losses
 
Value
Available-for-sale debt securities:
 
 
 
 
 
 
 
 
Corporate bonds
 
$
2,497,276

 
$
2,282

 
$
(18,987
)
 
$
2,480,571

U.S. government and government agency obligations
 
126,395

 
30

 
(1,589
)
 
124,836

Municipal bonds
 
2,572

 
—

 
(8
)
 
2,564

Commercial paper
 
76,013

 
—

 
—

 
76,013

Certificates of deposit
 
40,773

 
—

 
—

 
40,773

 
 
$
2,743,029

 
$
2,312

 
$
(20,584
)
 
$
2,724,757

 
 
 
 
 
 
 
 
 
As of December 31, 2017
 
 
 
 
 
 
 
 
Available-for-sale debt securities:
 
 
 
 
 
 
 
 
Corporate bonds
 
$
1,717,976

 
$
2,176

 
$
(7,672
)
 
$
1,712,480

U.S. government and government agency obligations
 
186,699

 
34

 
(1,241
)
 
185,492

Municipal bonds
 
4,600

 
—

 
(13
)
 
4,587

Commercial paper
 
106,973

 
—

 
—

 
106,973

Certificates of deposit
 
11,024

 
—

 
—

 
11,024

 
 
$
2,027,272

 
$
2,210

 
$
(8,926
)
 
$
2,020,556
Marketable Securities, Based on Contractual Maturity Dates
The fair values of available-for-sale debt security investments by contractual maturity consist of the following:
 
 
June 30,
2018
 
December 31,
2017
Maturities within one year
 
$
765,642

 
$
593,783

Maturities after one year through five years
 
1,959,115

 
1,426,773

 
 
$
2,724,757

 
$
2,020,556
Fair Value and Unrealized Losses of Marketable Securities
The following table shows the fair value of the Company's available-for-sale debt securities that have unrealized losses and that are deemed to be only temporarily impaired, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position.
 
Less than 12 Months
 
12 Months or Greater
 
Total
As of June 30, 2018
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
 
Fair Value
 
Unrealized Loss
Corporate bonds
$
1,588,876

 
$
(15,052
)
 
$
218,109

 
$
(3,935
)
 
$
1,806,985

 
$
(18,987
)
U.S. government and government agency obligations
45,936

 
(656
)
 
71,864

 
(933
)
 
117,800

 
(1,589
)
Municipal bonds
2,061

 
(8
)
 
—

 
—

 
2,061

 
(8
)
 
$
1,636,873

 
$
(15,716
)
 
$
289,973

 
$
(4,868
)
 
$
1,926,846

 
$
(20,584
)
 
 
 
 
 
 
 
 
 
 
 
 
As of December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds
$
930,970

 
$
(4,924
)
 
$
256,750

 
$
(2,748
)
 
$
1,187,720

 
$
(7,672
)
U.S. government and government agency obligations
110,532

 
(409
)
 
67,921

 
(832
)
 
178,453

 
(1,241
)
Municipal bonds
2,582

 
(10
)
 
2,005

 
(3
)
 
4,587

 
(13
)
 
$
1,044,084

 
$
(5,343
)
 
$
326,676

 
$
(3,583
)
 
$
1,370,760

 
$
(8,926
)