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Investments (Tables) | 6 Months Ended
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Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Schedule of amortized costs, gross unrealized gains and losses, and fair values of investments | ​
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June 30, 2023 | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
(in thousands) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Short-term U.S. treasury securities | $ | 305,091 | ​ | $ | 6 | ​ | $ | (506) | ​ | $ | 304,591
Total | $ | 305,091 | ​ | $ | 6 | ​ | $ | (506) | ​ | $ | 304,591
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December 31, 2022 | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
(in thousands) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Short-term U.S. treasury securities | $ | 283,705 | ​ | $ | 2 | ​ | $ | (247) | ​ | $ | 283,460
Total | $ | 283,705 | ​ | $ | 2 | ​ | $ | (247) | ​ | $ | 283,460

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