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Cash, Cash Equivalents and Restricted Cash (Tables) | 6 Months Ended
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Jun. 30, 2025
Cash and Cash Equivalents [Abstract] |
Schedule of cash and cash equivalents | Cash, cash equivalents and restricted cash as of December 31, 2024 and June 30, 2025 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | June 30,
​ | ​ | 2024 | ​ | 2025
Current assets: |  | ​ |  |  | ​ |
Cash and cash equivalents | ​ | $ | 89,512 | ​ | $ | 132,089
Restricted cash - standby letter of credit | ​ |  | 2,050 | ​ |  | 2,114
Total cash, cash equivalents and current portion of restricted cash | ​ | $ | 91,562 | ​ | $ | 134,203
Schedule of components of restricted cash | Cash, cash equivalents and restricted cash as of December 31, 2024 and June 30, 2025 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | June 30,
​ | ​ | 2024 | ​ | 2025
Current assets: |  | ​ |  |  | ​ |
Cash and cash equivalents | ​ | $ | 89,512 | ​ | $ | 132,089
Restricted cash - standby letter of credit | ​ |  | 2,050 | ​ |  | 2,114
Total cash, cash equivalents and current portion of restricted cash | ​ | $ | 91,562 | ​ | $ | 134,203

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