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Marketable securities | 9 Months Ended
--- | ---
Sep. 30, 2023
Marketable Securities |
Marketable Securities | 8. Marketable Securities ​ Available-for-sale debt securities were classified on the condensed consolidated balance sheets at fair value as follows: ​
​ | ​ | ​ | ​
​ | ​ | September 30,
​ |  | 2023
Cash and cash equivalents | ​ | $ | —
Marketable securities | ​ | ​ | 46,033
Total | ​ | $ | 46,033
​ The following table summarizes the available-for-sale securities held as of September 30, 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized Cost |  | Gross Unrealized (Losses) Gains | ​ | Fair Value
Corporate debt securities | ​ | $ | 17,858 | ​ | $ | (45) | ​ | $ | 17,813
U.S. Treasury securities | ​ | ​ | 23,741 | ​ | ​ | (1) | ​ | ​ | 23,740
Government-sponsored securities | ​ | ​ | 4,486 | ​ | ​ | (6) | ​ | ​ | 4,480
Total | ​ | $ | 46,085 | ​ | $ | (52) | ​ | $ | 46,033
​ The following table summarizes the contractual maturities of available-for-sale securities other than investments in money market funds as of September 30, 2023: ​
​ | ​ | ​ | ​
​ | ​ | September 30,
​ |  | 2023
Matures within one year | ​ | $ | 40,116
Matures after one year through five years | ​ | ​ | 5,917
Total | ​ | $ | 46,033
​ The Company did not record any allowances for credit losses to adjust the fair value of available-for-sale debt securities during the three and nine months ended September 30, 2023. 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 September 30, 2023. ​ The Company did not hold marketable securities as of December 31, 2022. There were no sales of marketable securities during the three and nine months ended September 30, 2023. 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.

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