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Note 6 - Stockholders' Equity and Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Total stock-based compensation expense | $ 5,617 | $ 2,982 | $ 16,487 | $ 6,793
Share-Based Payment Arrangement, Expense | 5,617 | 2,982 | 16,487 | 6,793
Time-based Options [Member] |  |  |  |
Total stock-based compensation expense | 3,937 | 2,131 | 11,623 | 4,609
Share-Based Payment Arrangement, Expense | 3,937 | 2,131 | 11,623 | 4,609
Performance-based Options [Member] |  |  |  |
Total stock-based compensation expense | 0 | 5 | 0 | 27
Share-Based Payment Arrangement, Expense | 0 | 5 | 0 | 27
Market-based Options [Member] |  |  |  |
Total stock-based compensation expense | 1,577 | 788 | 4,581 | 1,978
Share-Based Payment Arrangement, Expense | 1,577 | 788 | 4,581 | 1,978
Employee Stock Purchase Plan Award [Member] |  |  |  |
Total stock-based compensation expense | 103 | 58 | 283 | 179
Share-Based Payment Arrangement, Expense | 103 | 58 | 283 | 179
Cost of Sales [Member] |  |  |  |
Total stock-based compensation expense | 52 | 0 | 52 | 0
Share-Based Payment Arrangement, Expense | 52 | 0 | 52 | 0
Research and Development Expense [Member] |  |  |  |
Total stock-based compensation expense | 2,232 | 1,108 | 7,329 | 3,058
Share-Based Payment Arrangement, Expense | 2,232 | 1,108 | 7,329 | 3,058
Selling, General and Administrative Expenses [Member] |  |  |  |
Total stock-based compensation expense | 3,333 | 1,874 | 9,106 | 3,735
Share-Based Payment Arrangement, Expense | $ 3,333 | $ 1,874 | $ 9,106 | $ 3,735

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