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Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of liability components of the Convertible Notes
The Convertible Notes consist of the following (in thousands):
 
Liability component
 
June 30, 2018
 
December 31, 2017
Principal
 
$
250,000

 
$
250,000

Less: debt discount (1)
 
(76,555
)
 
(81,566
)
Less: deferred financing (1)
 
(4,005
)
 
(4,267
)
Net carrying value of the debt
 
$
169,440

 
$
164,167

 
______________________________________
(1) Included in the consolidated balance sheets within convertible notes and amortized to interest expense over the remaining life of the convertible notes 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 for the three and six months ended June 30, 2018, respectively:
 
Components (In thousands)
 
Three months ended
June 30, 2018
 
Six months ended
June 30, 2018
Contractual interest expense
 
$
1,888

 
$
3,775

Amortization of debt discount
 
2,539

 
5,011

Amortization of deferred financing
 
133

 
262

Total
 
$
4,560

 
$
9,048