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Debt (Tables)
 6 Months Ended
Jun. 30, 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)
 
June 30, 2019
 
December 31, 2018
Principal
 
$
152,825

 
$
400,000

Less: debt discount
(1) 
 
(3,373
)
 
(74,145
)
Less: deferred financing
(1) 
 
(388
)
 
(4,115
)
Net carrying value of the debt
 
$
149,064

 
$
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 and six months ended June 30, 2019 and 2018, respectively:
 
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
Interest component (in thousands)
 
2019
 
2018
 
2019
 
2018
Contractual interest expense
 
$
4,146

 
$
1,888

 
$
8,959

 
$
3,775

Amortization of debt discount
 
423

 
2,539

 
1,982

 
5,011

Amortization of deferred financing
 
39

 
133

 
122

 
262

Total
 
$
4,608

 
$
4,560

 
$
11,063

 
$
9,048