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Note 6 - Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Total stock-based compensation expense | $ 1,912 | $ 5,681
Total stock-based compensation expense | 1,912 | 5,681
Service-based Options [Member] |  |
Total stock-based compensation expense | 2,692 | 4,107
Total stock-based compensation expense | 2,692 | 4,107
Market-based Options [Member] |  |
Total stock-based compensation expense | (907) | 1,469
Total stock-based compensation expense | (907) | 1,469
Restricted Stock Units (RSUs) [Member] |  |
Total stock-based compensation expense | 31 | 0
Total stock-based compensation expense | 31 | 0
Employee Stock Purchase Plan Award [Member] |  |
Total stock-based compensation expense | 96 | 105
Total stock-based compensation expense | 96 | 105
Cost of Product Revenue [Member] |  |
Total stock-based compensation expense | 44 | 0
Total stock-based compensation expense | 44 | 0
Research and Development [Member] |  |
Total stock-based compensation expense | 1,758 | 2,762
Total stock-based compensation expense | 1,758 | 2,762
Selling, General and Administrative [Member] |  |
Total stock-based compensation expense | 110 | 2,919
Total stock-based compensation expense | $ 110 | $ 2,919

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