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Short-Term Investments (Tables) | 9 Months Ended
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Sep. 30, 2025
Short-Term Investments |
Schedule of short-term investments | The following tables summarize short-term investments (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross Unrealized |  | Gross Unrealized |  | ​ | ​
​ | ​ | Amortized Cost | ​ | Gains | ​ | Losses | ​ | Fair Value
September 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Treasury bills | ​ | ​ | 74,240 | ​ | ​ | 35 | ​ | ​ | (1) | ​ | ​ | 74,274
Treasury notes | ​ | ​ | 47,281 | ​ | ​ | 16 | ​ | ​ | — | ​ | ​ | 47,297
Corporate debt securities | ​ | ​ | 9,866 | ​ | ​ | 5 | ​ | ​ | (1) | ​ | ​ | 9,870
Total | ​ | $ | 131,387 | ​ | $ | 56 | ​ | $ | (2) | ​ | $ | 131,441
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross Unrealized | ​ | Gross Unrealized | ​ | ​ | ​
​ |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
December 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Treasury notes | ​ | $ | 129,064 | ​ | $ | 136 | ​ | $ | (3) | ​ | $ | 129,197
Reverse repurchase agreements | ​ | ​ | 100,000 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 100,000
Treasury bills | ​ | ​ | 39,085 | ​ | ​ | 31 | ​ | ​ | (1) | ​ | ​ | 39,115
Total | ​ | $ | 268,149 | ​ | $ | 167 | ​ | $ | (4) | ​ | $ | 268,312
​

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