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Convertible Notes, net (Tables)
 9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Outstanding Convertible Note Balances The outstanding Convertible Notes balances as of September 30, 2018 and December 31, 2017 consist of the following:
 
 
 
 

September 30, 2018
 
December 31, 2017
 
(in thousands)
Principal
$
324,998

 
$
324,998

Less: debt discount
(37,968
)
 
(66,460
)
Net carrying amount
$
287,030

 
$
258,538
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 three and nine months ended September 30, 2018 and 2017:
 
 
 
 
 
 
 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
 
(in thousands)
 
(in thousands)
Contractual interest expense
$
1,625

 
$
1,625

 
$
4,875

 
$
3,250

Amortization of debt discount
9,887

 
8,063

 
28,493

 
15,805

Total
$
11,512

 
$
9,688

 
$
33,368

 
$
19,055
Summary of Future Minimum Payments under Term Loan Agreements Future minimum payments under the Convertible Notes are as follows:
 
 
Years Ending December 31,
Amount
 
(in thousands)
2018
$
—

2019
331,498

 
331,498

Less amounts representing interest
(6,500
)
Less debt discount, net
(37,968
)
Net carrying amount of Convertible Notes as of September 30, 2018
$
287,030