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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2020
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):
 
 
March 31, 2020
 
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
 
Level I
 
Level II
 
Level III
Financial Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Equivalents:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
 
$
351,469

 
$
—

 
$
—

 
$
351,469

 
$
351,469

 
$
—

 
$
—

Marketable Securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial paper
 
83,261

 
—

 
—

 
83,261

 
—

 
83,261

 
—

Certificate of deposits(1)
 
3,000

 
—

 
—

 
3,000

 
—

 
3,000

 
—

U.S. government notes
 
576,488

 
7,114

 
—

 
583,602

 
583,602

 
—

 
—

Corporate bonds
 
923,194

 
1,753

 
(3,116
)
 
921,831

 
—

 
921,831

 
—

Agency securities
 
283,044

 
939

 
(17
)
 
283,966

 
—

 
283,966

 
—

 
 
1,868,987

 
9,806

 
(3,133
)
 
1,875,660

 
583,602

 
1,292,058

 
—

Other Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds - restricted
 
4,307

 
—

 
—

 
4,307

 
4,307

 
—

 
—

Total Financial Assets
 
$
2,224,763

 
$
9,806

 
$
(3,133
)
 
$
2,231,436

 
$
939,378

 
$
1,292,058

 
$
—


 
 
December 31, 2019
 
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
 
Level I
 
Level II
 
Level III
Financial Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Equivalents:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
 
$
562,580

 
$
—

 
$
—

 
$
562,580

 
$
562,580

 
$
—

 
$
—

Certificate of deposits(1)
 
$
4,001

 
 
 
 
 
4,001

 
 
 
4,001

 
 
 
 
566,581

 
—

 
—

 
566,581

 
562,580

 
4,001

 
—

Marketable Securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial paper
 
66,717

 
—

 
—

 
66,717

 
—

 
66,717

 
—

Certificate of deposits(1)
 
3,000

 
—

 
—

 
3,000

 
—

 
3,000

 
—

U.S. government notes
 
518,884

 
414

 
(20
)
 
519,278

 
519,278

 
—

 
—

Corporate bonds
 
787,741

 
2,392

 
(73
)
 
790,060

 
—

 
790,060

 
—

Agency securities
 
233,491

 
577

 
(41
)
 
234,027

 
—

 
234,027

 
—

 
 
1,609,833

 
3,383

 
(134
)
 
1,613,082

 
519,278

 
1,093,804

 
—

Other Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds - restricted
 
4,229

 
—

 
—

 
4,229

 
4,229

 
—

 
—

Total Financial Assets
 
$
2,180,643

 
$
3,383

 
$
(134
)
 
$
2,183,892

 
$
1,086,087

 
$
1,097,805

 
$
—


______________________
(1) As of March 31, 2020 and December 31, 2019, 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):
 
 
March 31, 2020
Due in 1 year or less
 
$
1,173,934

Due in 1 year through 2 years
 
701,726

Total marketable securities
 
$
1,875,660