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Cash, Cash Equivalents, Marketable Securities and Restricted Cash (Tables)
 3 Months Ended
Mar. 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 March 31, 2019
(in thousands)
Cost
 
Gross
unrealized
Gain
 
Gross
unrealized
Loss
 
Fair
Value
Cash and cash equivalents
$
96,349

 
$
—

 
$
—

 
$
96,349

Corporate debt securities, current portion
138,194

 
96

 
(6
)
 
138,284

Commercial paper
134,948

 
52

 
(7
)
 
134,993

Asset-backed securities
68,278

 
30

 
(8
)
 
68,300

Money market
350

 
—

 
—

 
350

Certificates of deposit
51

 
—

 
—

 
51

 
$
438,170

 
$
178

 
$
(21
)
 
$
438,327

Included in cash and cash equivalents
$
96,349

 
$
—

 
$
—

 
$
96,349

Included in marketable securities, current and non-current
341,821

 
178

 
(21
)
 
341,978

Total cash, cash equivalents and marketable securities
$
438,170

 
$
178

 
$
(21
)
 
$
438,327

 
 
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, 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

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 restricted cash and cash equivalents
The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the Company's consolidated statements of cash flows.

(in thousands)
March 31, 2019
 
December 31, 2018
 
March 31, 2018
 
December 31, 2017
Cash and cash equivalents
$
96,349

 
$
79,749

 
$
114,322

 
$
49,060

Restricted cash
2,579

 
2,626

 
2,230

 
2,177

Cash and cash equivalents and restricted cash shown in the statement of cash flows
$
98,928

 
$
82,375

 
$
116,552

 
$
51,237