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Cash, Cash Equivalents, Marketable Securities and Restricted Cash (Tables)
 6 Months Ended
Jun. 30, 2018
Cash, Cash Equivalents, and Short-term Investments [Abstract]  
Schedule of cash and available-for-sale securities
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)
June 30, 2018
 
December 31, 2017
 
June 30, 2017
 
December 31, 2016
Cash and cash equivalents
$
73,311

 
$
49,060

 
$
37,394

 
$
187,026

Restricted cash
2,130

 
2,177

 
393

 
387

Cash and cash equivalents and restricted cash shown in the statement of cash flows
$
75,441

 
$
51,237

 
$
37,787

 
$
187,413

Cash, cash equivalents and marketable securities are classified as current unless mentioned otherwise below and consisted of the following:
 
 
As of June 30, 2018
(in thousands)
Cost
 
Gross
unrealized
Gain
 
Gross
unrealized
Loss
 
Fair
Value
Cash and cash equivalents
$
73,311

 
$
—

 
$
—

 
$
73,311

Corporate debt securities, current portion
271,855

 
—

 
(326
)
 
271,529

Corporate debt securities, non-current portion
13,875

 
—

 
(38
)
 
13,837

Commercial paper
144,726

 
15

 
(43
)
 
144,698

Asset-backed securities
49,077

 
—

 
(64
)
 
49,013

Money market
350

 
—

 
—

 
350

Certificates of deposit
50

 
—

 
—

 
50

 
$
553,244

 
$
15

 
$
(471
)
 
$
552,788

Included in cash and cash equivalents
$
73,311

 
$
—

 
$
—

 
$
73,311

Included in marketable securities, current and non-current
479,933

 
15

 
(471
)
 
479,477

Total cash, cash equivalents and marketable securities
$
553,244

 
$
15

 
$
(471
)
 
$
552,788

 
 
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

 
0

 
(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)
June 30, 2018
 
December 31, 2017
 
June 30, 2017
 
December 31, 2016
Cash and cash equivalents
$
73,311

 
$
49,060

 
$
37,394

 
$
187,026

Restricted cash
2,130

 
2,177

 
393

 
387

Cash and cash equivalents and restricted cash shown in the statement of cash flows
$
75,441

 
$
51,237

 
$
37,787

 
$
187,413