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Cash, Cash Equivalents, Marketable Securities and Restricted Cash (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2018
(in thousands)
Cost
 
Gross
unrealized
Gain
 
Gross
unrealized
Loss
 
Fair
Value
Cash and cash equivalents
$
201,827

 
$
—

 
$
—

 
$
201,827

Corporate debt securities, current portion
227,517

 
5

 
(123
)
 
227,399

Commercial paper
82,704

 
—

 
(49
)
 
82,655

Asset-backed securities
52,145

 
—

 
(44
)
 
52,101

Money market
350

 
—

 
—

 
350

Certificates of deposit
51

 
—

 
—

 
51

 
$
564,594

 
$
5

 
$
(216
)
 
$
564,383

Included in cash and cash equivalents
$
201,827

 
$
—

 
$
—

 
$
201,827

Included in marketable securities, current and non-current
362,767

 
5

 
(216
)
 
362,556

Total cash, cash equivalents and marketable securities
$
564,594

 
$
5

 
$
(216
)
 
$
564,383

 
 
As of December 31, 2017
(in thousands)
Cost
 
Gross
unrealized
Gain
 
Gross
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

Certificates of deposit
50

 
—

 
—

 
50

 
$
358,998

 
$
1

 
$
(437
)
 
$
358,562

Included in cash and cash equivalents
$
49,060

 
$
—

 
$
—

 
$
49,060

Included in marketable securities
309,938

 
1

 
(437
)
 
309,502

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

 
$
1

 
$
(437
)
 
$
358,562
Schedule of restricted cash and cash equivalents
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)
September 30, 2018
 
December 31, 2017
 
September 30, 2017
 
December 31, 2016
Cash and cash equivalents
$
201,827

 
$
49,060

 
$
64,133

 
$
187,026

Restricted cash
2,003

 
2,177

 
1,444

 
387

Cash and cash equivalents and restricted cash shown in the statement of cash flows
$
203,830

 
$
51,237

 
$
65,577

 
$
187,413