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Basis of Presentation and Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2025
Basis of Presentation and Significant Accounting Policies |
Schedule of cash, cash equivalents and restricted cash | The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the condensed consolidated statements of cash flows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ | ​ | 2025 | ​ | 2024
Unrestricted cash | ​ | $ | 5,832 | ​ | $ | 8,983
Unrestricted cash equivalents | ​ | ​ | 84,433 | ​ | ​ | 92,671
Total unrestricted cash and cash equivalents | ​ | $ | 90,265 | ​ | $ | 101,654
Short-term restricted cash | ​ | ​ | 1,410 | ​ | ​ | 1,330
Long-term restricted cash | ​ | ​ | 3,352 | ​ | ​ | 3,432
Total restricted cash | ​ | $ | 4,762 | ​ | $ | 4,762
Total unrestricted and restricted cash and cash equivalents | ​ | $ | 95,027 | ​ | $ | 106,416
Schedule of cash equivalents classified as available-for-sale debt securities | Cash equivalents classified as available-for-sale debt securities consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2025
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Estimated Fair
​ | ​ | Cost Basis | ​ | Gains | ​ | Losses | ​ | Value
U.S. treasury bills | ​ | $ | 25,556 | ​ | $ | 118 | ​ | $ | — | ​ | $ | 25,674
Total debt securities | ​ | $ | 25,556 | ​ | $ | 118 | ​ | $ | — | ​ | $ | 25,674
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Estimated Fair
​ | ​ | Cost Basis | ​ | Gains | ​ | Losses | ​ | Value
U.S. treasury bills | ​ | $ | 20,294 | ​ | $ | 73 | ​ | $ | — | ​ | $ | 20,367
Total debt securities | ​ | $ | 20,294 | ​ | $ | 73 | ​ | $ | — | ​ | $ | 20,367

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