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Marketable Securities | 9 Months Ended
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Sep. 30, 2024
Marketable Securities |
Marketable Securities | 4. Marketable Securities The following table summarizes the Company’s investments as of September 30, 2024 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Estimated
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
Marketable securities available-for-sale: | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |
U.S. treasury obligations and government agency securities | ​ | $ | 62,546 | ​ | $ | 128 | ​ | $ | — | ​ | $ | 62,674
Total available-for-sale securities | ​ | $ | 62,546 | ​ | $ | 128 | ​ | $ | — | ​ | $ | 62,674
​ The following table summarizes the Company’s investments as of December 31, 2023 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Estimated
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
Marketable securities available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasury obligations and government agency securities | ​ | $ | 177,991 | ​ | $ | 93 | ​ | $ | (1) | ​ | $ | 178,083
Total available-for-sale securities | ​ | $ | 177,991 | ​ | $ | 93 | ​ | $ | (1) | ​ | $ | 178,083
​ The aggregate fair value of marketable securities with unrealized losses was $0 and $11.9 million at September 30, 2024 and December 31, 2023, respectively. At September 30, 2024 and December 31, 2023, no investments and three investments, respectively, were in an unrealized loss position. All such investments have been in an unrealized loss position for less than a year and these losses are considered temporary. The Company has the ability and intent to hold these investments until a recovery of their amortized cost, which may not occur until maturity. ​ The Company believes that U.S. treasury obligations and government agency securities are subject to minimal credit risk. As a result, the Company did not record any charges for credit-related impairments for its available-for-sale securities for the nine months ended September 30, 2024.

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