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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Summary of Cost and Fair Value of Available-For-Sale Securities The cost and fair value of available-for-sale securities were as follows as of the dates indicated (in thousands):
 
Cost
 
Gross
Unrealized
Holding Loss
 
Gross
Unrealized
Holding Gain
 
Fair Value
December 31, 2019
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Commercial paper
$
5,794

 
$
—

 
$
—

 
$
5,794

Certificate of deposit
2,958

 
—

 
1

 
2,959

 
8,752

 
—

 
1

 
8,753

Short-term investments:
 
 
 
 
 
 
 
Commercial paper
29,319

 
(1
)
 
2

 
29,320

Certificate of deposit
26,129

 
(3
)
 
6

 
26,132

Corporate bonds
114,068

 
(22
)
 
156

 
114,202

U.S. Government and agency securities
204,246

 
(8
)
 
67

 
204,305

 
373,762

 
(34
)
 
231

 
373,959

Long-term investments:
 
 
 
 
 
 
 
Certificate of deposit
4,727

 
—

 
2

 
4,729

Corporate bonds
38,582

 
(35
)
 
16

 
38,563

U.S. Government and agency securities
46,017

 
(2
)
 
36

 
46,051

 
89,326

 
(37
)
 
54

 
89,343

 
$
471,840

 
$
(71
)
 
$
286

 
$
472,055

December 31, 2018
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Commercial paper
$
7,775

 
$
—

 
$
—

 
$
7,775

 
7,775


—


—


7,775

Short-term investments:
 
 
 
 
 
 
 
Commercial paper
147,860

 
—

 
—

 
147,860

Corporate bonds
46,836

 
(35
)
 
—

 
46,801

U.S. Government and agency securities
62,638

 
(9
)
 
12

 
62,641

 
257,334

 
(44
)
 
12

 
257,302

 
$
265,109

 
$
(44
)
 
$
12

 
$
265,077