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Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Summary of Components of Debt Obligations
The table below summarizes the components of the Company’s debt. 
 
September 30, 2018
 
December 31, 2017
2022 Notes
$
300,000

 
$
300,000

2023 Convertible Notes
316,250

 
—

Credit Facility
—

 
100,000

Total debt
616,250

 
400,000

Less: current portion of long-term debt, net
(296,851
)
 
—

Less: deferred debt discount
(46,078
)
 
—

Less: deferred debt issue costs
(10,004
)
 
(3,716
)
Long-term debt, net
$
263,317

 
$
396,284

Additional paid-in capital
$
35,306

 
$
—

Discount attribution to equity
(1,175
)
 
—

Equity component, net
$
34,131

 
$
—
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 and issuance costs for the 2023 Convertible Notes:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
 
(in thousands)
 
(in thousands)
Contractual interest expense
$
720

 
$
—

 
$
720

 
$
—

Amortization of debt discount and issuance costs(1)
938

 
—

 
938

 
—

Total
$
1,658

 
$
—

 
$
1,658

 
$
—

 
(1) 
The effective interest rate of the liability component was 5.45% as of September 30, 2018.