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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Summary of 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):
 
 
June 30, 2019
 
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
 
Level I
 
Level II
 
Level III
Financial Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Equivalents:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
 
$
518,039

 
$
—

 
$
—

 
$
518,039

 
$
518,039

 
$
—

 
$
—

Agency securities
 
3,992

 
—

 
—

 
3,992

 
—

 
3,992

 
—

U.S. government notes
 
3,996

 
—

 
—

 
3,996

 
3,996

 
—

 
—

 
 
526,027

 
—

 
—

 
526,027

 
522,035

 
3,992

 
—

Marketable Securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds
 
658,913

 
2,863

 
(33
)
 
661,743

 
—

 
661,743

 
—

U.S. government notes
 
342,004

 
834

 
(11
)
 
342,827

 
342,827

 
—

 
—

Agency securities
 
269,193

 
864

 
(28
)
 
270,029

 
—

 
270,029

 
—

Commercial paper
 
35,790

 
—

 
—

 
35,790

 
—

 
35,790

 
—

Certificates of deposits (1)
 
3,000

 
—

 
—

 
3,000

 
—

 
3,000

 
—

 
 
1,308,900

 
4,561

 
(72
)
 
1,313,389

 
342,827

 
970,562

 
—

Other Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds - restricted
 
4,222

 
—

 
—

 
4,222

 
4,222

 
—

 
—

Total Financial Assets
 
$
1,839,149

 
$
4,561

 
$
(72
)
 
$
1,843,638

 
$
869,084

 
$
974,554

 
$
—


 
 
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:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds
 
660,353

 
264

 
(1,399
)
 
659,218

 
—

 
659,218

 
—

U.S. government notes
 
308,946

 
118

 
(286
)
 
308,778

 
308,778

 
—

 
—

Agency securities
 
273,993

 
240

 
(511
)
 
273,722

 
—

 
273,722

 
—

Commercial paper
 
59,479

 
—

 
—

 
59,479

 
—

 
59,479

 
—

Certificates of deposits (1)
 
5,000

 
—

 
—

 
5,000

 
—

 
5,000

 
—

 
 
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 June 30, 2019 and December 31, 2018, all of our certificates of deposits were domestic deposits.
Fair Value of Available-For-Sale Investments By Contractual Maturity The fair values of available-for-sale marketable securities, by remaining contractual maturity, are as follows (in thousands):
 
 
June 30, 2019
Due in 1 year or less
 
$
932,285

Due in 1 year through 2 years
 
381,104

Total marketable securities
 
$
1,313,389