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Convertible Notes (Tables) | 6 Months Ended
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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 |

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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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