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Short-Term Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
Short-Term Investments |
Schedule of the short-term investments | The following tables summarize the short-term investments held at December 31, 2023 and 2022 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Gross Unrealized | ​ | Gross Unrealized | ​ | ​ | ​
​ |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities | ​ | $ | 16,508 | ​ | $ | — | ​ | $ | (63) | ​ | $ | 16,445
Treasury bills | ​ | ​ | 5,983 | ​ | ​ | — | ​ | ​ | (3) | ​ | ​ | 5,980
Yankee securities | ​ | ​ | 2,000 | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | 1,999
U.S. agency bonds | ​ | ​ | 3,000 | ​ | ​ | — | ​ | ​ | (12) | ​ | ​ | 2,988
Reverse repurchase agreements | ​ | ​ | 178,500 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 178,500
Total | ​ | $ | 205,991 | ​ | $ | — | ​ | $ | (79) | ​ | $ | 205,912

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