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Cash, Cash Equivalents, Marketable Securities and Restricted Cash (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018
(in thousands)
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Fair
Value
Cash and cash equivalents
$
79,749

 
$
—

 
$
—

 
$
79,749

Corporate debt securities, current portion
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

Certificate of deposit
51

 
—

 
—

 
51

 
$
504,579

 
$
11

 
$
(438
)
 
$
504,152

Included in cash and cash equivalents
$
79,749

 
$
—

 
$
—

 
$
79,749

Included in marketable securities, current
424,830

 
11

 
(438
)
 
424,403

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

 
$
11

 
$
(438
)
 
$
504,152

 
As of December 31, 2017
(in thousands)
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Fair
Value
Cash and cash equivalents
$
49,060

 
$
—

 
$
—

 
$
49,060

Corporate debt securities, current portion
199,314

 
1

 
(303
)
 
199,012

Commercial paper
79,878

 
—

 
(75
)
 
79,803

Asset-backed securities
30,346

 
—

 
(59
)
 
30,287

Money market
350

 
—

 
—

 
350

Certificate of deposit
50

 
—

 
—

 
50

 
$
358,998

 
$
1

 
$
(437
)
 
$
358,562

Included in cash and cash equivalents
$
49,060

 
$
—

 
$
—

 
$
49,060

Included in marketable securities, current
309,938

 
1

 
(437
)
 
309,502

Total cash, cash equivalents and marketable securities
$
358,998

 
$
1

 
$
(437
)
 
$
358,562
Schedule of reconciliation of cash and cash equivalents and restricted cash
The following table provides a reconciliation of cash and cash equivalents, and restricted cash reported within the consolidated balance sheet that sum to the total of the same such amounts shown in the Statement of Cash Flows:
(in thousands)
 
December 31, 2018
 
December 31, 2017
 
December 31, 2016
Cash and cash equivalents
 
$
79,749

 
$
49,060

 
$
187,026

Restricted cash
 
2,626

 
2,177

 
387

Cash and cash equivalents and restricted cash shown in the statement of cash flows
 
$
82,375

 
$
51,237

 
$
187,413