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Fair Value Measurement - Schedule of Assets and Liabilities Measured at Fair Value On A Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Assets: |  |  |
Money market funds | $ 167,707 | $ 213,667 | $ 262,757
Available-for-sale securities | 14,474 | 22,279 |
Recurring |  |  |
Assets: |  |  |
Total assets at fair value on a recurring basis | 107,697 | 22,496 |
Money market funds | Recurring |  |  |
Assets: |  |  |
Money market funds | 78,308 | 217 |
U.S. treasury bills | Recurring |  |  |
Assets: |  |  |
Available-for-sale securities | 14,915 |  |
Tax-exempt municipal securities |  |  |
Assets: |  |  |
Available-for-sale securities | 11,392 | 15,347 |
Tax-exempt municipal securities | Recurring |  |  |
Assets: |  |  |
Available-for-sale securities | 11,392 | 15,347 |
Corporate debt securities |  |  |
Assets: |  |  |
Available-for-sale securities | 3,082 | 6,932 |
Corporate debt securities | Recurring |  |  |
Assets: |  |  |
Available-for-sale securities | 3,082 | 6,932 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Recurring |  |  |
Assets: |  |  |
Total assets at fair value on a recurring basis | 93,223 | 217 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Money market funds | Recurring |  |  |
Assets: |  |  |
Money market funds | 78,308 | 217 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | U.S. treasury bills | Recurring |  |  |
Assets: |  |  |
Available-for-sale securities | 14,915 |  |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Tax-exempt municipal securities | Recurring |  |  |
Assets: |  |  |
Available-for-sale securities | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Corporate debt securities | Recurring |  |  |
Assets: |  |  |
Available-for-sale securities | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Recurring |  |  |
Assets: |  |  |
Total assets at fair value on a recurring basis | 14,474 | 22,279 |
Significant Other Observable Inputs (Level 2) | Money market funds | Recurring |  |  |
Assets: |  |  |
Money market funds | 0 | 0 |
Significant Other Observable Inputs (Level 2) | U.S. treasury bills | Recurring |  |  |
Assets: |  |  |
Available-for-sale securities | 0 |  |
Significant Other Observable Inputs (Level 2) | Tax-exempt municipal securities | Recurring |  |  |
Assets: |  |  |
Available-for-sale securities | 11,392 | 15,347 |
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Recurring |  |  |
Assets: |  |  |
Available-for-sale securities | 3,082 | 6,932 |
Significant Unobservable Inputs (Level 3) | Recurring |  |  |
Assets: |  |  |
Total assets at fair value on a recurring basis | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Money market funds | Recurring |  |  |
Assets: |  |  |
Money market funds | 0 | 0 |
Significant Unobservable Inputs (Level 3) | U.S. treasury bills | Recurring |  |  |
Assets: |  |  |
Available-for-sale securities | 0 |  |
Significant Unobservable Inputs (Level 3) | Tax-exempt municipal securities | Recurring |  |  |
Assets: |  |  |
Available-for-sale securities | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Recurring |  |  |
Assets: |  |  |
Available-for-sale securities | $ 0 | $ 0 |

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- Definition Amount 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/2003/role/disclosureRef -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 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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