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Short-Term Investments (Tables) | 3 Months Ended
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Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Summary of short-term investments | Short-term investments as of December 31, 2023 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Estimated
​ |  | Cost |  | Gain (Loss) |  | Fair Value
U.S. government securities | ​ | $ | 157,628 | ​ | $ | 28 | ​ | $ | 157,656
Certificates of deposit | ​ |  | 530 | ​ |  | — | ​ |  | 530
Total short-term investments | ​ | $ | 158,158 | ​ | $ | 28 | ​ | $ | 158,186
​ Short-term investments as of March 31, 2024 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Estimated
​ |  | Cost |  | Gain (Loss) |  | Fair Value
U.S. government securities | ​ | $ | 158,942 | ​ | $ | 14 | ​ | $ | 158,956
Certificates of deposit | ​ | ​ | 530 | ​ | ​ | — | ​ | ​ | 530
Total short-term investments | ​ | $ | 159,472 | ​ | $ | 14 | ​ | $ | 159,486
​

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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