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Convertible Notes (Tables) | 3 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Schedule of convertible notes | The Company’s convertible notes are shown in the following table:
(In thousands) | As of March 31, 2019 |  | As of December 31, 2018
2023 Notes | $ | 172,500 |  |  | $ | 172,500 |
Unamortized discount - 2023 Notes | (26,964 | ) |  | (28,517 | )
Unamortized debt issuance costs - 2023 Notes | (1,924 | ) |  | (2,049 | )
Total convertible notes | $ | 143,612 |  |  | $ | 141,934 |
Less current portion | — |  |  | — |
Total long-term convertible notes | $ | 143,612 |  |  | $ | 141,934 |
Schedule of interest expense on notes | Interest expense related to the notes for the three months ended March 31, 2019 and 2018 was as follows:
| Three Months Ended
| March 31,
| 2019 |  | 2018
| (In thousands)
2023 Notes coupon interest at a rate of 1.375% | $ | 593 |  |  | $ | 593 |
2023 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 4.9% | 1,678 |  |  | 1,590 |
2018 Notes coupon interest at a rate of 1.125% | — |  |  | 53 |
2018 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 5.5% | — |  |  | 1,090 |
Total interest expense on convertible notes | $ | 2,271 |  |  | $ | 3,326 |

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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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