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Debt (Tables)
 9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Schedule of liability components of the Convertible Notes
The Convertible Notes and Senior Secured Term Loan consist of the following (in thousands):
 
Liability component
 
September 30, 2018
 
December 31, 2017
Principal
 
$
400,000

 
$
250,000

Less: debt discount (1)
 
(76,946
)
 
(81,566
)
Less: deferred financing (1)
 
(4,246
)
 
(4,267
)
Net carrying value of the debt
 
$
318,808

 
$
164,167

 
______________________________________
(1) Included in the consolidated balance sheets within convertible notes and senior secured term loan and amortized to interest expense over the remaining life of the Convertible Notes and Senior Secured Term Loan using the effective interest rate method.
Components of total interest expense recognized related to the Convertible Notes
The following table sets forth total interest expense recognized related to the Convertible Notes and Senior Secured Term Loan for the three and nine months ended September 30, 2018, respectively:
 
Components (In thousands)
 
Three Months Ended September 30, 2018
 
Nine Months Ended September 30, 2018
Contractual interest expense
 
$
1,969

 
$
5,744

Amortization of debt discount
 
2,609

 
7,620

Amortization of deferred financing
 
137

 
399

Total
 
$
4,715

 
$
13,763