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Note 12 - Convertible Senior Notes (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2025
Notes Tables |
Convertible Debt [Table Text Block] |
|  | June 30, |  |  | December 31, |
​ |  | 2025 |  |  | 2024 |
2026 Notes |  |  |  |  |  |  |  |
Principal |  | $ | 3,500 |  |  | $ | 3,500 |
Unamortized debt issuance costs |  |  | — |  |  |  | (83 | )
Net carrying amount |  |  | 3,500 |  |  |  | 3,417 |
2030 Notes |  |  |  |  |  |  |  |
Principal |  |  | 125,000 |  |  |  | 125,000 |
Premium upon issuance |  |  | 9,398 |  |  |  | 10,416 |
Unamortized debt issuance costs |  |  | (3,962 | ) |  |  | (4,336 | )
Net carrying amount |  |  | 130,436 |  |  |  | 131,080 |
Total net carrying amount |  | $ | 133,936 |  |  | $ | 134,497 |
Interest Income and Interest Expense Disclosure [Table Text Block] |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
​ |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Contractual interest expense |  | $ | 46 |  |  | $ | 1,056 |  |  | $ | 92 |  |  | $ | 2,111 |
Amortization of debt issuance costs |  |  | 350 |  |  |  | 359 |  |  |  | 701 |  |  |  | 709 |
Total interest cost |  | $ | 396 |  |  | $ | 1,415 |  |  | $ | 793 |  |  | $ | 2,820 |
Effective interest rate |  |  | 1.0 | % |  |  | 5.3 | % |  |  | 1.0 | % |  |  | 5.3 | %

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- Definition Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount. + References No definition available. + Details
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