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Stock-based compensation (Recognized Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Share-Based Payment |  |
Total stock-based compensation expense | $ 2,916 | $ 2,455
Employee Stock Option |  |
Share-Based Payment |  |
Total stock-based compensation expense | 2,231 | 2,214
Unrecognized compensation expense-options | 22,400 |
Restricted Stock |  |
Share-Based Payment |  |
Total stock-based compensation expense | 395 | 92
Performance Stock Units |  |
Share-Based Payment |  |
Total stock-based compensation expense | 192 |
ESPP |  |
Share-Based Payment |  |
Total stock-based compensation expense | 98 | 149
Selling, general & administrative |  |
Share-Based Payment |  |
Total stock-based compensation expense | 2,576 | 2,255
Research & development |  |
Share-Based Payment |  |
Total stock-based compensation expense | 308 | 165
Cost of goods sold |  |
Share-Based Payment |  |
Total stock-based compensation expense | $ 32 | $ 35

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