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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2025
Financial Instruments |
Schedule of available-for-sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2025 | ​ | December 31, 2024
​ |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Estimated Fair Value |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Estimated Fair Value
​ | ​ | (in thousands) |  | ​ | ​
Cash, cash equivalents and restricted cash (2) | ​ | $ | 1,000,021 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,000,021 | ​ | $ | 945,587 | ​ | $ | — | ​ | $ | — | ​ | $ | 945,587
Municipal securities (1) | ​ | ​ | 16,000 | ​ | ​ | — | ​ | ​ | (25) | ​ | ​ | 15,975 | ​ | ​ | 23,019 | ​ | ​ | — | ​ | ​ | (330) | ​ | ​ | 22,689
Total | ​ | $ | 1,016,021 | ​ | $ | — | ​ | $ | (25) | ​ | $ | 1,015,996 | ​ | $ | 968,606 | ​ | $ | — | ​ | $ | (330) | ​ | $ | 968,276
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Classified as: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash, cash equivalents and restricted cash (2) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 1,000,021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 945,587
Short-term investments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 15,975 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 22,689
Total | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 1,015,996 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 968,276
​
| (1) | Per the Company’s investment policy, all debt securities are classified as short-term investments irrespective of holding period.
| (2) | Cash equivalents includes liquid demand deposits and money market funds.
Schedule of debt securities available-for-sale in unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Total
​ | ​ | Fair Value | ​ | Unrealized Loss
​ | (in thousands)
Municipal securities | ​ | ​ | 11,975 | ​ | ​ | (25)
Total | ​ | $ | 11,975 | ​ | $ | (25)
Summarized portfolio of available-for-sale securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​

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