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Marketable securities | 12 Months Ended
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Dec. 31, 2023
Marketable Securities |
Marketable Securities | 7. Marketable Securities ​ Available-for-sale debt securities were classified on the consolidated balance sheets at fair value as follows: ​
​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023
Cash and cash equivalents | ​ | $ | 4,729
Marketable securities | ​ | ​ | 71,601
Total | ​ | $ | 76,330
​ The following table summarizes the available-for-sale securities held as of December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses | ​ | Fair Value
Corporate debt securities | ​ | $ | 41,610 | ​ | $ | 47 | ​ | $ | (45) | ​ | $ | 41,612
U.S. Treasury securities | ​ | ​ | 30,189 | ​ | ​ | 8 | ​ | ​ | — | ​ | ​ | 30,197
Government-sponsored securities | ​ | ​ | 4,517 | ​ | ​ | 4 | ​ | ​ | — | ​ | ​ | 4,521
Total | ​ | $ | 76,316 | ​ | $ | 59 | ​ | $ | (45) | ​ | $ | 76,330
​ The following table summarizes the contractual maturities of available-for-sale securities other than investments in money market funds as of December 31, 2023: ​
​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023
Matures within one year | ​ | $ | 61,672
Matures after one year through five years | ​ | ​ | 14,658
Total | ​ | $ | 76,330
​ The Company did not record any allowances for credit losses to adjust the fair value of available-for-sale debt securities during the year ended December 31, 2023. ​ The Company did not hold marketable securities as of December 31, 2022. There were no sales of marketable securities during the year ended December 31, 2023. Net unrealized holding gains or losses for the period that have been included in other comprehensive income were not material to the Company’s consolidated results of operations.

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