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Debt (Tables)
 3 Months Ended
Mar. 31, 2019
Debt Disclosure [Abstract]  
Schedule of liability components of the Convertible Notes
The Convertible Notes and Senior Secured Term Loan consist of the following:
 
Liability component (in thousands)
 
March 31, 2019
 
December 31, 2018
Principal
 
180,702

 
$
400,000

Less: debt discount (1)
 
(11,076
)
 
(74,145
)
Less: deferred financing (1)
 
(808
)
 
(4,115
)
Net carrying value of the debt
 
$
168,818

 
$
321,740

 
______________________________________
(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 months ended March 31, 2019 and 2018, respectively:
 
 
 
Three Months Ended March 31,
Interest component (in thousands)
 
2019
 
2018
Contractual interest expense
 
4,813

 
$
1,887

Amortization of debt discount
 
1,559

 
2,472

Amortization of deferred financing
 
83

 
129

Total
 
$
6,455

 
$
4,488