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Marketable Securities | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |  |
Marketable Securities | 4. Marketable Securities All marketable securities were considered available-for-sale as of September 30, 2023 and December 31, 2022. The amortized cost, gross unrealized holding gains or losses, and fair value of the Company’s marketable securities by major security type are summarized in the tables below (in thousands):
|  | September 30, 2023 |
|  | Amortized Cost Basis |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 4,469 |  |  | $ | — |  |  | $ | (13 | ) |  | $ | 4,456 |
Commercial paper |  |  | 7,942 |  |  |  | — |  |  |  | (5 | ) |  |  | 7,937 |
U.S. agency securities |  |  | 36,700 |  |  |  | — |  |  |  | (74 | ) |  |  | 36,626 |
Asset-backed securities |  |  | 1,982 |  |  |  | — |  |  |  | (3 | ) |  |  | 1,979 |
Total available-for-sale securities |  | $ | 51,093 |  |  | $ | — |  |  | $ | (95 | ) |  | $ | 50,998 |
|  | December 31, 2022 |
|  | Amortized Cost Basis |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 65,807 |  |  | $ | — |  |  | $ | (416 | ) |  | $ | 65,391 |
Commercial paper |  |  | 115,381 |  |  |  | 13 |  |  |  | (333 | ) |  |  | 115,061 |
U.S. agency securities |  |  | 53,767 |  |  |  | 15 |  |  |  | (327 | ) |  |  | 53,455 |
Asset-backed securities |  |  | 1,914 |  |  |  | — |  |  |  | — |  |  |  | 1,914 |
Total available-for-sale securities |  | $ | 236,869 |  |  | $ | 28 |  |  | $ | (1,076 | ) |  | $ | 235,821 |
The amortized cost of available-for-sale securities is adjusted for amortization of premiums and accretion of discounts to maturity. As of September 30, 2023, the aggregate fair value of securities with remaining maturities of less than one year held by the Company in an unrealized loss position was $51.0 million. The Company has the intent and ability to hold such securities until recovery and has determined that there has been no material change to its credit risk. As a result, the Company determined it did not hold any investments with a credit loss at September 30, 2023. There were no realized gains or losses recognized on the sale or maturity of available-for-sale securities during the three and nine months ended September 30, 2023, and as a result, there were no reclassifications out of accumulated other comprehensive gain (loss) for the same periods. | 4. Marketable Securities All marketable securities were considered available-for-sale as of December 31, 2022. The amortized cost, gross unrealized holding gains or losses, and fair value of the Company’s marketable securities by major security type are summarized in the table below (in thousands):
|  | December 31, 2022 |
|  | Amortized Cost Basis |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 65,807 |  |  | $ | — |  |  | $ | (416 | ) |  | $ | 65,391 |
Commercial paper |  |  | 115,381 |  |  |  | 13 |  |  |  | (333 | ) |  |  | 115,061 |
U.S. agency securities |  |  | 53,767 |  |  |  | 15 |  |  |  | (327 | ) |  |  | 53,455 |
Asset-backed securities |  |  | 1,914 |  |  |  | — |  |  |  | — |  |  |  | 1,914 |
Total available-for-sale securities |  | $ | 236,869 |  |  | $ | 28 |  |  | $ | (1,076 | ) |  | $ | 235,821 |
The amortized cost of available-for-sale securities is adjusted for amortization of premiums and accretion of discounts to maturity. As of December 31, 2022, the aggregate fair value of securities with remaining maturities of less than one year held by the Company in an unrealized loss position was $220.5 million. The aggregate fair value of securities with remaining maturities of more than one year held by the Company in an unrealized loss position was $15.3 million. The Company has the intent and ability to hold such securities until recovery and has determined that there has been no material change to its credit risk. As a result, the Company determined it did not hold any investments with a credit loss at December 31, 2022. There were no realized gains or losses recognized on the sale or maturity of available-for-sale securities during year ended December 31, 2021, and as a result, there were no reclassifications out of accumulated other comprehensive gain (loss) for the same periods. The Company did not hold any marketable securities as of December 31, 2021.

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