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Note 6 - Convertible Senior Notes (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Convertible Debt [Table Text Block] |
|  | Balance as of December 31, 2023 |
|  | 2023 Notes |  |  | 2026 Notes |  |  | Total |
|  | (In thousands) |
Principal amount |  | $ | — |  |  | $ | 215,924 |  |  | $ | 215,924 |
Unamortized debt issuance costs |  |  | — |  |  |  | (2,769 | ) |  |  | (2,769 | )
Total convertible senior notes, net |  | $ | — |  |  | $ | 213,155 |  |  | $ | 213,155 |
Fair value of outstanding convertible senior notes (1) |  | $ | — |  |  | $ | 131,444 |  |  |  |  |
|  | Balance as of December 31, 2022 |
|  | 2023 Notes |  |  | 2026 Notes |  |  | Total |
|  | (In thousands) |
Principal amount |  | $ | 95,000 |  |  | $ | 225,030 |  |  | $ | 320,030 |
Unamortized debt issuance costs |  |  | (619 | ) |  |  | (4,124 | ) |  |  | (4,743 | )
Total convertible senior notes, net |  | $ | 94,381 |  |  | $ | 220,906 |  |  | $ | 315,287 |
Fair value of outstanding convertible senior notes (1) |  | $ | 92,031 |  |  | $ | 118,141 |  |  |  |  |
Schedule Of Debt Instrument, Interest Expense Recognized [Table Text Block] |
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
|  | (In thousands) |
Contractual interest expense |  | $ | 5,195 |  |  | $ | 5,938 |  |  | $ | 5,938 |
Amortization of debt issuance costs |  |  | 619 |  |  |  | 663 |  |  |  | 618 |
Total interest expense |  | $ | 5,814 |  |  | $ | 6,601 |  |  | $ | 6,556 |
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
|  | (In thousands) |
Contractual interest expense |  | $ | 11,774 |  |  | $ | 11,814 |  |  | $ | 11,814 |
Amortization of debt issuance costs |  |  | 1,355 |  |  |  | 1,167 |  |  |  | 1,078 |
Total interest expense |  | $ | 13,129 |  |  | $ | 12,981 |  |  | $ | 12,892 |

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