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Convertible Notes (Tables)
 9 Months Ended
Sep. 30, 2017
Debt Disclosure [Abstract]  
Schedule of convertible notes
The Company’s convertible notes are shown in the following table:
(In thousands)
 
As of September 30, 2017
 
As of December 31, 2016
1.125% Convertible Senior Notes due 2018
 
$
138,000

 
$
138,000

Unamortized discount
 
(6,014
)
 
(10,913
)
Unamortized debt issuance costs
 
(496
)
 
(920
)
Total convertible notes
 
$
131,490

 
$
126,167

Less current portion
 
131,490

 
—

Total long-term convertible notes
 
$
—

 
$
126,167
Schedule of interest expense on notes
Interest expense related to the notes for the three and nine months ended September 30, 2017 and 2016 was as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
 
(In thousands)
2018 Notes coupon interest at a rate of 1.125%
$
388

 
$
388

 
1,164

 
1,164

2018 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 5.5%
1,801

 
1,699

 
5,324

 
5,025

Total interest expense on convertible notes
$
2,189

 
$
2,087

 
$
6,488

 
$
6,189