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Convertible Notes (Tables) | 6 Months Ended
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Jun. 30, 2017
Debt Disclosure [Abstract] |
Schedule of convertible notes | The Company’s convertible notes are shown in the following table:
(In thousands) |  | As of June 30, 2017 |  | As of December 31, 2016
1.125% Convertible Senior Notes due 2018 |  | $ | 138,000 |  |  | $ | 138,000 |
Unamortized discount |  | (7,673 | ) |  | (10,913 | )
Unamortized debt issuance costs |  | (637 | ) |  | (920 | )
Total convertible notes |  | $ | 129,690 |  |  | $ | 126,167 |
Less current portion |  | — |  |  | — |
Total long-term convertible notes |  | $ | 129,690 |  |  | $ | 126,167 |
Schedule of interest expense on notes | Interest expense related to the notes for the three and six months ended June 30, 2017 and 2016 was as follows:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (In thousands)
2018 Notes coupon interest at a rate of 1.125% | $ | 388 |  |  | $ | 388 |  |  | 776 |  |  | 776 |
2018 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 5.5% | 1,774 |  |  | 1,675 |  |  | 3,523 |  |  | 3,326 |
Total interest expense on convertible notes | $ | 2,162 |  |  | $ | 2,063 |  |  | $ | 4,299 |  |  | $ | 4,102 |

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- Definition Tabular disclosure of the amounts of interest expense related to convertible notes during the reporting period. + References No definition available. + Details
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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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