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Debt (Tables)
9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Summary of Components of Debt Obligations
The table below summarizes the components of the Company’s debt: 
 
September 30,
2019
 
December 31,
2018
2023 Convertible Notes
$
316,250

 
$
316,250

Total debt
316,250

 
316,250

Less: deferred debt discount
(37,588
)
 
(43,998
)
Less: deferred debt issue costs
(5,607
)
 
(6,681
)
Long-term debt, net (1)
$
273,055

 
$
265,571

Additional paid-in capital
$
35,306

 
$
35,306

Discount attribution to equity
(1,175
)
 
(1,175
)
Equity component, net
$
34,131

 
$
34,131

 
(1) 
There were no current portions of long-term debt as of September 30, 2019 and December 31, 2018.
Summary of Interest Expense
The table below summarizes the amount of interest cost recognized by us for both the contractual interest expense and amortization of the debt discount for the 2023 Convertible Notes:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Contractual interest expense
$
1,581

 
$
720

 
$
4,743

 
$
720

Amortization of debt discount (1)
2,166

 
938

 
6,411

 
938

Total
$
3,747

 
$
1,658

 
$
11,154

 
$
1,658

 
(1) 
The effective interest rate of the liability component was 5.45% as of September 30, 2019.