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Convertible Notes (Tables)
 3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of convertible notes
The Company’s convertible notes are shown in the following table:
(In thousands)
 
As of March 31, 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
 
(33,042
)
 
(34,506
)
Unamortized discount - 2018 Notes
 
(1,540
)
 
(2,547
)
Unamortized debt issuance costs - 2023 Notes
 
(2,422
)
 
(2,547
)
Unamortized debt issuance costs - 2018 Notes
 
(125
)
 
(209
)
Total convertible notes
 
$
216,578

 
$
213,898

Less current portion
 
79,541

 
78,451

Total long-term convertible notes
 
$
137,037

 
$
135,447
Schedule of interest expense on notes
Interest expense related to the notes for the three months ended March 31, 2018 and 2017 was as follows:
 
Three Months Ended
 
March 31,
 
2018
 
2017
 
(In thousands)
2023 Notes coupon interest at a rate of 1.375%
$
593

 
$
—

2023 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 4.9%
1,590

 
—

2018 Notes coupon interest at a rate of 1.125%
53

 
388

2018 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 5.5%
1,090

 
1,749

Total interest expense on convertible notes
$
3,326

 
$
2,137