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Convertible Notes, net (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Outstanding Convertible Note Balances
 The Company’s outstanding Convertible Note balances as of December 31, 2017 and 2016 consist of the following:
 
 
 
December 31,
 
2017
 
2016
 
(in thousands)
Liability component:
    
 
 
Principal
$
324,998

 
$
324,998

Less: debt discount
(66,460
)
 
(99,414
)
Net carrying amount
$
258,538

 
$
225,584
Schedule of Total Interest Expense Recognized Related to Convertible Notes
The following table sets forth total interest expense recognized related to the Convertible Notes during the years ended December 31, 2017 and 2016: 
 
 
 
Year Ended December 31,
 
2017
 
2016
 
(in thousands)
Contractual interest expense
$
6,500

 
$
577

Amortization of debt discount
32,954

 
2,676

Total interest expense
$
39,454

 
$
3,253
Schedule of Future Minimum Payments Under Term Loan Agreements
Future minimum payments under the Convertible Notes as are as follows:
Years Ending December 31,
Amount
 
(in thousands)
2018
$
6,500

2019
331,498

 
337,998

Less amounts representing interest
(13,000
)
Less debt discount, net
(66,460
)
Net carrying amount of Convertible Notes as of December 31, 2017
$
258,538