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STOCK-BASED COMPENSATION (Stock-based compensation expense) (Tables) | 6 Months Ended
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Jun. 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 six months ended June 30, 2025 and 2024, respectively.
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​ |  | Three Months Ended June 30, |  | Six Months Ended June 30, |
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
​ |  | (in thousands) | ​
Stock-based compensation expense |  | $ | 9,234 | ​ | $ | 9,188 |  | $ | 25,046 |  | $ | 18,415 |

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