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Marketable securities | 3 Months Ended
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Mar. 31, 2024
Marketable Securities |
Marketable Securities | 6. Marketable Securities ​ Available-for-sale debt securities were classified on the condensed consolidated balance sheets at fair value as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2024 | ​ | 2023
Cash and cash equivalents | ​ | $ | — | ​ | $ | 4,729
Marketable securities | ​ | ​ | 89,438 | ​ | ​ | 71,601
Total | ​ | $ | 89,438 | ​ | $ | 76,330
​ The following table summarizes the available-for-sale securities held as of March 31, 2024 and December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
March 31, 2024 | ​ | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses | ​ | Fair Value
Corporate debt securities | ​ | $ | 62,618 | ​ | $ | 10 | ​ | $ | (127) | ​ | $ | 62,501
U.S. Treasury securities | ​ | ​ | 24,448 | ​ | ​ | — | ​ | ​ | (6) | ​ | ​ | 24,442
Government-sponsored securities | ​ | ​ | 2,496 | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | 2,495
Total | ​ | $ | 89,562 | ​ | $ | 10 | ​ | $ | (134) | ​ | $ | 89,438
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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 March 31, 2024 and December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2024 | ​ | 2023
Matures within one year | ​ | $ | 60,015 | ​ | $ | 61,672
Matures after one year through five years | ​ | ​ | 29,423 | ​ | ​ | 14,658
Total | ​ | $ | 89,438 | ​ | $ | 76,330
​ The unrealized losses on the Company’s available-for-sale securities were immaterial as of March 31, 2024 and December 31, 2023. In addition, there were no sales of marketable securities during the three months ended March 31, 2024. Net unrealized holding gains or losses for the period that have been included in accumulated other comprehensive loss were not material to the Company’s condensed consolidated results of operations. ​ The Company did not record any allowances for credit losses to adjust the fair value of available-for-sale debt securities during the three months ended March 31, 2024. The Company reviews its investments for other-than-temporary impairment whenever the fair value of an investment is less than amortized cost and evidence indicates that an investment’s carrying amount is not recoverable within a reasonable period of time. To determine whether an impairment is other-than-temporary, the Company considers whether it has the ability and intent to hold the investment until a market price recovery and considers whether evidence indicating the cost of the investment is recoverable outweighs evidence to the contrary. The Company generally does not intend to sell any investments prior to recovery of their amortized cost basis for any investment in an unrealized loss position. As such, the Company did not hold any securities with other-than-temporary impairment as of March 31, 2024 and December 31, 2023.

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