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Fair Value Measurements (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Fair Value Disclosures [Abstract] |  |
Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis | The following tables set forth the financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy as of September 30, 2023 and December 31, 2022 (in thousands):
|  | September 30, 2023 |
|  | Total Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) |  | $ | 182,988 |  |  | $ | 182,988 |  |  | $ | — |  |  | $ | — |
Commercial paper (1) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total cash equivalents |  |  | 182,988 |  |  |  | 182,988 |  |  |  | — |  |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries(2) |  |  | 4,456 |  |  |  | 4,456 |  |  |  | — |  |  |  | — |
Commercial paper(2) |  |  | 7,937 |  |  |  | — |  |  |  | 7,937 |  |  |  | — |
U.S. agency securities(2) |  |  | 36,626 |  |  |  | — |  |  |  | 36,626 |  |  |  | — |
Asset-backed securities(2) |  |  | 1,979 |  |  |  | — |  |  |  | 1,979 |  |  |  | — |
Total marketable securities |  |  | 50,998 |  |  |  | 4,456 |  |  |  | 46,542 |  |  |  | — |
Total cash equivalents and marketable securities |  | $ | 233,986 |  |  | $ | 187,444 |  |  | $ | 46,542 |  |  | $ | — |
|  | December 31, 2022 |
|  | Total Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) |  | $ | 45,739 |  |  | $ | 45,739 |  |  | $ | — |  |  | $ | — |
Commercial paper (1) |  |  | 1,991 |  |  |  | — |  |  |  | 1,991 |  |  |  | — |
Total cash equivalents |  |  | 47,730 |  |  |  | 45,739 |  |  |  | 1,991 |  |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries(2) |  |  | 65,391 |  |  |  | 65,391 |  |  |  | — |  |  |  | — |
Commercial paper(2) |  |  | 115,061 |  |  |  | — |  |  |  | 115,061 |  |  |  | — |
U.S. agency securities(2) |  |  | 53,455 |  |  |  | — |  |  |  | 53,455 |  |  |  | — |
Asset-backed securities(2) |  |  | 1,914 |  |  |  | — |  |  |  | 1,914 |  |  |  | — |
Total marketable securities |  |  | 235,821 |  |  |  | 65,391 |  |  |  | 170,430 |  |  |  | — |
Total cash equivalents and marketable securities |  | $ | 283,551 |  |  | $ | 111,130 |  |  | $ | 172,421 |  |  | $ | — |
(1) | Included within cash and cash equivalents on the condensed balance sheets. (2) Included within investments in marketable securities, current and investments in marketable securities, non-current on the condensed balance sheets.
| The following tables set forth the financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy as of December 31, 2022 and 2021 (in thousands):
|  | December 31, 2022 |
|  | Total Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) |  | $ | 45,739 |  |  | $ | 45,739 |  |  | $ | — |  |  | $ | — |
Commercial paper (1) |  |  | 1,991 |  |  |  | — |  |  |  | 1,991 |  |  |  | — |
Total cash equivalents |  |  | 47,730 |  |  |  | 45,739 |  |  |  | 1,991 |  |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  |  | 65,391 |  |  |  | 65,391 |  |  |  | — |  |  |  | — |
Commercial paper |  |  | 115,061 |  |  |  | — |  |  |  | 115,061 |  |  |  | — |
U.S. agency securities(2) |  |  | 53,455 |  |  |  | — |  |  |  | 53,455 |  |  |  | — |
Asset-backed securities(2) |  |  | 1,914 |  |  |  | — |  |  |  | 1,914 |  |  |  | — |
Total marketable securities |  |  | 235,821 |  |  |  | 65,391 |  |  |  | 170,430 |  |  |  | — |
Total cash equivalents and marketable securities |  | $ | 283,551 |  |  | $ | 111,130 |  |  | $ | 172,421 |  |  | $ | — |
|  | December 31, 2021 |
|  | Total Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Money market funds (1) |  | $ | 376,976 |  |  | $ | 376,976 |  |  | $ | — |  |  | $ | — |
(1) | Included within cash and cash equivalents on the balance sheet.(2)Included within investments in marketable securities, current and investments in marketable securities, non-current on the balance sheet.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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