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Convertible Notes (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of convertible notes
The Company’s convertible notes are shown in the following table:
(In thousands)
 
As of June 30, 2018
 
As of December 31, 2017
2023 Notes
 
$
172,500

 
$
172,500

2018 Notes
 
81,207

 
81,207

Total principal amount of convertible notes
 
$
253,707

 
$
253,707

Unamortized discount - 2023 Notes
 
(31,556
)
 
(34,506
)
Unamortized discount - 2018 Notes
 
(517
)
 
(2,547
)
Unamortized debt issuance costs - 2023 Notes
 
(2,297
)
 
(2,547
)
Unamortized debt issuance costs - 2018 Notes
 
(42
)
 
(209
)
Total convertible notes
 
$
219,295

 
$
213,898

Less current portion
 
80,648

 
78,451

Total long-term convertible notes
 
$
138,647

 
$
135,447
Schedule of interest expense on notes
Interest expense related to the notes for the three and six months ended June 30, 2018 and 2017 was as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
2023 Notes coupon interest at a rate of 1.375%
$
593

 
$
—

 
$
1,186

 
$
—

2023 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 4.9%
1,610

 
—

 
3,199

 
—

2018 Notes coupon interest at a rate of 1.125%
228

 
388

 
281

 
776

2018 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 5.5%
1,106

 
1,774

 
2,197

 
3,523

Total interest expense on convertible notes
$
3,537

 
$
2,162

 
$
6,863

 
$
4,299