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STOCK-BASED COMPENSATION (Stock-based compensation expense) (Tables) | 9 Months Ended
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Sep. 30, 2025
Stock-Based Compensation [Abstract] |
Summary of stock-based compensation expense | The following is a summary of our stock-based compensation expense for the three and nine months ended September 30, 2025 and 2024, respectively.
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​ |  | Three Months Ended September 30, |  | Nine Months Ended September 30, |
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
​ |  | (in thousands) | ​
Stock-based compensation expense |  | $ | 9,277 | ​ | $ | 9,083 |  | $ | 34,323 |  | $ | 27,498 |

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