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v3.25.2

Note 6 - Debt (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Debt [Table Text Block] |
​ |  |  | June 30, |  |  | December 31, |
​ |  |  | 2025 |  |  | 2024 |
​ |  |  | (In thousands) |
Exchange of 2026 Notes for common stock (share-settled liability) | Short-term |  | $ | 7,627 |  |  | $ | — |
Convertible senior notes, net maturing on June 15, 2029 (2029 Notes) | Long-term |  |  | 63,474 |  |  |  | — |
|  |  |  | 71,101 |  |  |  | — |
Term debt, net maturing on June 3, 2028 (Term Loan) | Short-term |  |  | — |  |  |  | 21,000 |
Term debt, net maturing on June 3, 2028 (Term Loan) | Long-Term |  |  | 87,313 |  |  |  | 69,405 |
|  |  |  | 87,313 |  |  |  | 90,405 |
Convertible senior notes, net maturing on February 15, 2026 (2026 Notes) | Short-term |  |  | 17,017 |  |  |  | — |
Convertible senior notes, net maturing on February 15, 2026 (2026 Notes) | Long-term |  |  | — |  |  |  | 97,178 |
|  |  |  | 17,017 |  |  |  | 97,178 |
|  |  | $ | 175,431 |  |  | $ | 187,583 |
Convertible Debt [Table Text Block] |
​ |  | June 30, |
​ |  | 2025 |
​ |  | (In thousands) |
Principal amount |  | $ | 70,785 |
Unamortized debt discount, net of issuance costs |  |  | (22,331 | )
Fair value of embedded derivative |  |  | 15,020 |
Total unsecured convertible senior notes, net |  | $ | 63,474 |
​ |  | ​ |
Fair value of outstanding unsecured convertible senior notes (1) |  | $ | 59,263 |
​ |  | June 30, |  |  | December 31, |
​ |  | 2025 |  |  | 2024 |
​ |  | (In thousands) |
Principal amount |  | $ | 17,077 |  |  | $ | 97,862 |
Unamortized debt issuance costs |  |  | (60 | ) |  |  | (684 | )
Total unsecured convertible senior notes, net |  | $ | 17,017 |  |  | $ | 97,178 |
Fair value of outstanding unsecured convertible senior notes (1) |  | $ | 16,048 |  |  | $ | 93,752 |
Schedule Of Debt Instrument, Interest Expense Recognized [Table Text Block] |
|  | Three and Six Months Ended |
|  | June 30, |
|  | 2025 |
|  | (In thousands) |
Contractual interest expense |  | $ | 859 |
Amortization of debt discount and issuance costs |  |  | 748 |
Total interest expense |  | $ | 1,607 |
​ |  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
​ |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
​ |  | (In thousands) |
Contractual interest expense |  | $ | 2,231 |  |  | $ | 714 |  |  | $ | 4,464 |  |  | $ | 714 |
Amortization of debt premium and issuance costs |  |  | (1,306 | ) |  |  | (599 | ) |  |  | (3,214 | ) |  |  | (599 | )
Total interest expense |  | $ | 925 |  |  | $ | 115 |  |  | $ | 1,250 |  |  | $ | 115 |
​ |  | Three Months Ended |  |  | Six Months Ended |
​ |  | June 30, |  |  | June 30, |
​ |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
​ |  | (In thousands) |
Contractual interest expense |  | $ | 790 |  |  | $ | 2,369 |  |  | $ | 2,074 |  |  | $ | 5,203 |
Amortization of debt discount and issuance costs |  |  | 92 |  |  |  | 261 |  |  |  | 240 |  |  |  | 569 |
Total interest expense |  | $ | 882 |  |  | $ | 2,630 |  |  | $ | 2,314 |  |  | $ | 5,772 |
Schedule of Long-Term Debt Instruments [Table Text Block] |
​ |  | June 30, |  |  | December 31, |
​ |  | 2025 |  |  | 2024 |
​ |  | (In thousands) |
Principal amount |  | $ | 67,077 |  |  | $ | 67,077 |
Unamortized debt premium, net of issuance costs and other |  |  | 20,349 |  |  |  | 23,563 |
Fair value of embedded derivative |  |  | (113 | ) |  |  | (235 | )
Total term debt, net |  | $ | 87,313 |  |  | $ | 90,405 |
Schedule of Maturities of Long-Term Debt [Table Text Block] |
|  | 2026 Notes |  |  | Term Loan |  |  | 2029 Notes |  |  | Total |
|  | (In thousands) |
2025 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
2026 |  |  | 17,077 |  |  |  | — |  |  |  | — |  |  |  | 17,077 |
2027 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
2028 |  |  | — |  |  |  | 67,077 |  |  |  | — |  |  |  | 67,077 |
2029 and thereafter |  |  | — |  |  |  | — |  |  |  | 70,785 |  |  |  | 70,785 |
Total principal payments |  |  | 17,077 |  |  |  | 67,077 |  |  |  | 70,785 |  |  |  | 154,939 |
Net unamortized premiums, discounts, derivatives and issuance costs |  |  | (60 | ) |  |  | 20,236 |  |  |  | (7,311 | ) |  |  | 12,865 |
Carrying value of debt |  | $ | 17,017 |  |  | $ | 87,313 |  |  | $ | 63,474 |  |  | $ | 167,804 |

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