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Marketable securities - available-for-sale debt securities (Tables) | 3 Months Ended
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Mar. 31, 2024
Marketable securities - available-for-sale debt securities |
Schedule of marketable securities | As of March 31, 2024, the Company has the following investments in marketable securities (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Aggregate
​ | ​ | Remaining | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | estimated
​ |  | contractual maturity |  | cost |  | gains |  | losses |  | fair value
Available-for-sale debt securities: |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate debt securities |  | 3 months to 1 year | ​ | $ | 2,981 | ​ | $ | 1 | ​ | $ | — | ​ | $ | 2,982
​ |  |  | ​ | $ | 2,981 | ​ | $ | 1 | ​ | $ | — | ​ | $ | 2,982
Schedule of aggregate fair value and number of securities held by the Company in an unrealized loss position | The aggregate fair value (in thousands) and number of securities held by the Company (including those classified as cash equivalents) in an unrealized loss position as of March 31, 2024 and December 31, 2023 are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024 | ​ | December 31, 2023
​ |  | Fair market value of investments in an unrealized loss position | ​ | Number of investments in an unrealized loss position | ​ | Unrealized losses | ​ | Fair market value of investments in an unrealized loss position | ​ | Number of investments in an unrealized loss position | ​ | Unrealized losses
Marketable securities in a continuous loss position for less than 12 months: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities |  | $ | — |  | ​ | — | ​ | $ | — |  | $ | 1,600 |  | ​ | 1 |  | $ | (1)
​ |  | $ | — |  | ​ | — | ​ | $ | — |  | $ | 1,600 |  | ​ | 1 |  | $ | (1)

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