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Marketable Securities (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |  |
Summary of Amortized Cost Gross Unrealized Holding Gains or Losses and Fair Value of 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 |
|  | 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 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
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