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Note 6 - Debt (Tables) | 9 Months Ended
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Sep. 30, 2024
Notes Tables |
Schedule of Long-Term Debt Instruments [Table Text Block] |
​ |  | September 30, |
​ |  | 2024 |
​ |  | (In thousands) |
Principal amount |  | $ | 67,077 |
Unamortized debt premium, net of issuance costs and other |  |  | 25,350 |
Total long-term debt |  | $ | 92,427 |
Schedule Of Debt Instrument, Interest Expense Recognized [Table Text Block] |
​ |  | Three Months Ended |  |  | Nine Months Ended |
​ |  | September 30, 2024 |
​ |  | (In thousands) |
Contractual interest expense |  | $ | 2,433 |  |  | $ | 3,147 |
Amortization of premium and debt issuance costs |  |  | (2,060 | ) |  |  | (2,659 | )
Total interest expense |  | $ | 373 |  |  | $ | 488 |
​ |  | Three Months Ended |  |  | Nine Months Ended |
​ |  | September 30, |  |  | September 30, |
​ |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
​ |  | (In thousands) |  |  | (In thousands) |
Contractual interest expense |  | $ | — |  |  | $ | 1,484 |  |  | $ | — |  |  | $ | 4,453 |
Amortization of debt issuance costs |  |  | — |  |  |  | 179 |  |  |  | — |  |  |  | 528 |
Total |  | $ | — |  |  | $ | 1,663 |  |  | $ | — |  |  | $ | 4,981 |
​ |  | Three Months Ended |  |  | Nine Months Ended |
​ |  | September 30, |  |  | September 30, |
​ |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
​ |  | (In thousands) |  |  | (In thousands) |
Contractual interest expense |  | $ | 1,284 |  |  | $ | 2,954 |  |  | $ | 6,488 |  |  | $ | 8,861 |
Amortization of debt issuance costs |  |  | 144 |  |  |  | 312 |  |  |  | 713 |  |  |  | 922 |
Total interest expense |  | $ | 1,428 |  |  | $ | 3,266 |  |  | $ | 7,201 |  |  | $ | 9,783 |
Convertible Debt [Table Text Block] |
​ |  | September 30, |  |  | December 31, |
​ |  | 2024 |  |  | 2023 |
​ |  | (In thousands) |
Principal amount |  | $ | 97,862 |  |  | $ | 215,924 |
Unamortized debt issuance costs |  |  | (830 | ) |  |  | (2,769 | )
Total unsecured convertible senior notes, net |  | $ | 97,032 |  |  | $ | 213,155 |
​ |  |  |  |  |  | ​ |
Fair value of outstanding unsecured convertible senior notes (1) |  | $ | 66,668 |  |  | $ | 131,444 |
Schedule of Maturities of Long-Term Debt [Table Text Block] |
|  | 2026 Notes |  |  | Term Loan |  |  | Total |
|  | (In thousands) |
2025 |  | $ | — |  |  | $ | 20,000 |  |  | $ | 20,000 |
2026 |  |  | 97,862 |  |  |  | — |  |  |  | 97,862 |
2027 |  |  | — |  |  |  | — |  |  |  | — |
2028 |  |  | — |  |  |  | 47,077 |  |  |  | 47,077 |
2029 and thereafter |  |  | — |  |  |  | — |  |  |  | — |
Total principal payments |  |  | 97,862 |  |  |  | 67,077 |  |  |  | 164,939 |
Unamortized premiums, discounts and issuance costs and other |  |  | (830 | ) |  |  | 25,350 |  |  |  | 24,520 |
Carrying value of debt |  | $ | 97,032 |  |  | $ | 92,427 |  |  | $ | 189,459 |

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