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Debt (Tables)
6 Months Ended
Jun. 30, 2016
Debt Disclosure [Abstract]  
Convertible Debt
The Convertible Notes consisted of the following at June 30, 2016 (in thousands):
Liability component:
 
Principal
$
120,000

Less: unamortized debt discount and debt issuance costs
(33,316
)
Net carrying amount
$
86,684

Equity component
$
38,305

Interest Expense Summary
The following table sets forth total interest expense recognized related to the Convertible Notes during the three and six months ended June 30, 2016 and 2015 (in thousands):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2016
 
2015
 
2016
 
2015
Contractual interest expense
$
1,650

 
$
367

 
$
3,300

 
$
367

Amortization of debt discount
1,980

 
440

 
3,960

 
440

Amortization of debt issuance costs
131

 
29

 
263

 
29

Total interest expense
$
3,761

 
$
836

 
$
7,523

 
$
836