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Short-Term Investments (Tables) | 6 Months Ended
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Jun. 30, 2024
Short-Term Investments |
Schedule of the short-term investments | The following table summarizes the short-term investments held at June 30, 2024 and December 31, 2023 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross Unrealized |  | Gross Unrealized |  | ​ | ​
​ | ​ | Amortized Cost | ​ | Gains | ​ | Losses | ​ | Fair Value
June 30, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Treasury bills | ​ | $ | 108,696 | ​ | $ | 1 | ​ | $ | (25) | ​ | $ | 108,672
Reverse repurchase agreements | ​ | ​ | 100,000 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 100,000
Treasury notes | ​ | ​ | 58,840 | ​ | ​ | 1 | ​ | ​ | (22) | ​ | ​ | 58,819
Total | ​ | $ | 267,536 | ​ | $ | 2 | ​ | $ | (47) | ​ | $ | 267,491
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross Unrealized | ​ | Gross Unrealized | ​ | ​ | ​
​ |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reverse repurchase agreements | ​ | $ | 71,000 | ​ | $ | — | ​ | $ | — | ​ | $ | 71,000
Total | ​ | $ | 71,000 | ​ | $ | — | ​ | $ | — | ​ | $ | 71,000
​

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