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Cash, Cash Equivalents, Marketable Securities, and Restricted Cash (Tables)
 12 Months Ended
Dec. 31, 2019
Cash, Cash Equivalents, and Short-term Investments [Abstract]  
Schedule of Cash and Available for Sale Securities
Cash, cash equivalents, and marketable securities are classified as current unless mentioned otherwise below and consisted of the following:
 
 
As of December 31, 2019
(in thousands)
 
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
Loss
 
Fair
Value
Cash and cash equivalents
 
$
142,837

 
$
—

 
$
—

 
$
142,837

Corporate debt securities
 
145,875

 
121

 
(5
)
 
145,991

Commercial paper
 
73,659

 
53

 
(2
)
 
73,710

Asset-backed securities
 
77,731

 
79

 
—

 
77,810

U.S. government agency bonds
 
11,999

 
2

 
(10
)
 
11,991

Money market
 
350

 
—

 
—

 
350

Certificates of deposit
 
51

 
—

 
—

 
51

 
 
$
452,502

 
$
255

 
$
(17
)
 
$
452,740

Included in cash and cash equivalents
 
$
142,837

 
$
—

 
$
—

 
$
142,837

Included in marketable securities (1)
 
309,665

 
255

 
(17
)
 
309,903

Total cash, cash equivalents, and marketable securities
 
$
452,502

 
$
255

 
$
(17
)
 
$
452,740

______________________________
(1) As of December 31, 2019, $9.5 million of marketable securities have maturity dates greater than 12 months and are available to convert into cash, if needed. 

 
 
As of December 31, 2018
(in thousands)
 
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
Loss
 
Fair
Value
Cash and cash equivalents
 
$
79,749

 
$
—

 
$
—

 
$
79,749

Corporate debt securities
 
240,969

 
7

 
(250
)
 
240,726

Commercial paper
 
115,245

 
—

 
(104
)
 
115,141

Asset-backed securities
 
68,215

 
4

 
(84
)
 
68,135

Money market
 
350

 
—

 
—

 
350

Certificates of deposit
 
51

 
—

 
—

 
51

 
 
$
504,579

 
$
11

 
$
(438
)
 
$
504,152

Included in cash and cash equivalents
 
$
79,749

 
$
—

 
$
—

 
$
79,749

Included in marketable securities
 
424,830

 
11

 
(438
)
 
424,403

Total cash, cash equivalents, and marketable securities
 
$
504,579

 
$
11

 
$
(438
)
 
$
504,152
Schedule of Reconciliation of Cash and Cash Equivalents and Restricted Cash
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Consolidated Statements of Cash Flows.
(in thousands)
 
December 31, 2019
 
December 31, 2018
 
December 31, 2017
Cash and cash equivalents
 
$
142,837

 
$
79,749

 
$
49,060

Restricted cash
 
3,506

 
2,626

 
2,177

Cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows
 
$
146,343

 
$
82,375

 
$
51,237