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Convertible Notes (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of convertible notes | The Company’s convertible notes are shown in the following table:
|  | As of December 31,
(In thousands) |  | 2020 |  | 2019
2023 Notes |  | $ | 172,500 |  |  | $ | 172,500 |
Unamortized discount - 2023 Notes |  | (15,420) |  |  | (22,163) |
Unamortized debt issuance costs - 2023 Notes |  | (1,049) |  |  | (1,549) |
Total convertible notes |  | 156,031 |  |  | 148,788 |
Less current portion |  | — |  |  | — |
Total long-term convertible notes |  | $ | 156,031 |  |  | $ | 148,788 |
Schedule of interest expense on notes | Interest expense related to the notes for the years ended December 31, 2020, 2019 and 2018 was as follows:
|  | Years Ended December 31,
(In thousands) |  | 2020 |  | 2019 |  | 2018
2023 Notes coupon interest at a rate of 1.375% |  | $ | 2,372 |  |  | $ | 2,372 |  |  | $ | 2,372 |
2023 Notes amortization of discount and debt issuance cost at an additional effective interest rate of 4.9% |  | 7,243 |  |  | 6,854 |  |  | 6,486 |
2018 Notes coupon interest at a rate of 1.125% |  | — |  |  | — |  |  | 377 |
2018 Notes amortization of discount and debt issuance cost at an additional effective interest rate of 5.5% |  | — |  |  | — |  |  | 2,756 |
Total interest expense on convertible notes |  | $ | 9,615 |  |  | $ | 9,226 |  |  | $ | 11,991 |

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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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