Quarterly report pursuant to Section 13 or 15(d)

Debt Instruments (Tables)

v3.10.0.1
Debt Instruments (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of long-term debt Long-term debt, net consisted of the following:

 
As of December 31,
 
As of June 30,
 
2017
 
2018
 
(in thousands)
1.75% convertible senior notes due 2020
$
345,000

 
$
152,100

1.75% convertible senior notes due 2023
—

 
192,900

Unamortized discount and deferred issuance costs
(71,986
)
 
(94,733
)
Long-term debt, net
$
273,014

 
$
250,267

Summary of the effective interest rate, contractually stated interest expense and costs related to amortization of discount for the Notes The following tables outlines the effective interest rate, contractually stated interest expense and costs related to the amortization of the discount for the Notes:

 
Three months ended 
 June 30,
 
2017
 
2018
 
2017
 
2018
 
2020 Notes
 
2023 Notes
 
(in thousands except for effective interest rate)
Effective interest rate
10.18
%
 
10.18
%
 
N/A
 
10.38
%
Contractually stated interest expense
$
1,493

 
$
1,119

 
N/A
 
$
347

Amortization of discount
$
4,912

 
$
4,043

 
N/A
 
$
979



 
Six months ended 
 June 30,
 
2017
 
2018
 
2017
 
2018
 
2020 Notes
 
2023 Notes
 
(in thousands except for effective interest rate)
Effective interest rate
10.18
%
 
10.18
%
 
N/A
 
10.38
%
Contractually stated interest expense
$
3,002

 
$
2,629

 
N/A
 
$
347

Amortization of discount
$
9,799

 
$
9,438

 
N/A
 
$
979