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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Summary of Fair Value of Financial Assets by Level
The following tables summarize the 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):
 
 
September 30, 2018
 
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
 
Level I
 
Level II
 
Level III
Financial Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash Equivalents:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
 
$
170,604

 
$
—

 
$
—

 
$
170,604

 
$
170,604

 
$
—

 
$
—

Marketable Securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial paper
 
46,572

 
—

 
—

 
46,572

 
—

 
46,572

 
—

U.S. government notes
 
227,086

 
—

 
(513
)
 
226,573

 
226,573

 
—

 
—

Corporate bonds
 
581,093

 
19

 
(1,408
)
 
579,704

 
—

 
579,704

 
—

Agency securities
 
285,261

 
—

 
(998
)
 
284,263

 
—

 
284,263

 
—

 
 
1,140,012

 
19

 
(2,919
)
 
1,137,112

 
226,573

 
910,539

 
—

Other Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds - restricted
 
4,210

 
—

 
—

 
4,210

 
4,210

 
—

 
—

Total Financial Assets
 
$
1,314,826

 
$
19

 
$
(2,919
)
 
$
1,311,926

 
$
401,387

 
$
910,539

 
$
—


 
 
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 Investments By Contractual Maturity
The fair values of available-for-sale marketable securities, by remaining contractual maturity, are as follows (in thousands):
 
 
September 30, 2018
Due in 1 year or less
 
$
792,542

Due in 1 year through 2 years
 
344,570

Total marketable securities
 
$
1,137,112