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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Fair Value of Financial Assets by Level
The following tables summarize the amortized costs, unrealized gains and losses, and fair value of these financial assets by significant investment category and their level within the fair value hierarchy (in thousands):
 
 
December 31, 2018
 
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
 
Level I
 
Level II
 
Level III
Financial Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Equivalents:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
 
$
322,080

 
$
—

 
$
—

 
$
322,080

 
$
322,080

 
$
—

 
$
—

Marketable Securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial paper
 
59,479

 
—

 
—

 
59,479

 
—

 
59,479

 
—

Certificates of deposits (1)
 
5,000

 
—

 
—

 
5,000

 
—

 
5,000

 
—

U.S. government notes
 
308,946

 
118

 
(286
)
 
308,778

 
308,778

 
—

 
—

Corporate bonds
 
660,353

 
264

 
(1,399
)
 
659,218

 
—

 
659,218

 
—

Agency securities
 
273,993

 
240

 
(511
)
 
273,722

 
—

 
273,722

 
—

 
 
1,307,771

 
622

 
(2,196
)
 
1,306,197

 
308,778


997,419

 
—

Other Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds - restricted
 
4,214

 
—

 
—

 
4,214

 
4,214

 
—

 
—

Total Financial Assets
 
$
1,634,065

 
$
622

 
$
(2,196
)
 
$
1,632,491

 
$
635,072

 
$
997,419

 
$
—

____________________
(1) As of December 31, 2018, all of our certificates of deposits were domestic deposits.

 
 
December 31, 2017
 
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
 
Level I
 
Level II
 
Level III
Financial Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Equivalents:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
 
$
701,145

 
$
—

 
$
—

 
$
701,145

 
$
701,145

 
$
—

 
$
—

Agency securities
 
12,728

 
—

 
—

 
12,728

 
 
 
12,728

 
—

 
 
713,873

 
—

 
—

 
713,873

 
701,145

 
12,728

 
—

Marketable Securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial paper
 
11,924

 
—

 
—

 
11,924

 
—

 
11,924

 
—

U.S. government notes
 
137,025

 
—

 
(378
)
 
136,647

 
136,647

 
—

 
—

Corporate bonds
 
313,080

 
20

 
(616
)
 
312,484

 
—

 
312,484

 
—

Agency securities
 
215,923

 
2

 
(617
)
 
215,308

 
—

 
215,308

 
—

 
 
677,952

 
22

 
(1,611
)
 
676,363

 
136,647

 
539,716

 
—

Other Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds - restricted
 
5,505

 
—

 
—

 
5,505

 
5,505

 
—

 
—

Total Financial Assets
 
$
1,397,330

 
$
22

 
$
(1,611
)
 
$
1,395,741

 
$
843,297

 
$
552,444

 
$
—
Fair Value of Available-for-sale Marketable Securities by Remaining Contractual Maturity
The fair values of available-for-sale marketable securities, by remaining contractual maturity, are as follows (in thousands):
 
 
December 31, 2018
Due in 1 year or less
 
$
875,498

Due in 1 year through 2 years
 
430,699

Total marketable securities
 
$
1,306,197