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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Assets |  |  |  |
Money market funds | $ 119,332 | $ 150,279 | $ 154,511 | $ 202,004
Available-for-sale debt securities | 644,660 | 592,023 |  |
U.S. treasuries |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 170,325 | 74,237 |  |
U.S. government agency securities |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 167,859 | 216,688 |  |
Corporate debt securities |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 306,476 | 301,098 |  |
Recurring Fair Value Measurements |  |  |  |
Assets |  |  |  |
Total assets | 744,820 | 731,112 |  |
Recurring Fair Value Measurements | Money market funds |  |  |  |
Assets |  |  |  |
Money market funds | 100,160 | 131,635 |  |
Recurring Fair Value Measurements | U.S. treasuries |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 170,325 | 74,237 |  |
Recurring Fair Value Measurements | U.S. government agency securities |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 167,859 | 216,688 |  |
Recurring Fair Value Measurements | Corporate debt securities |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 306,476 | 308,552 |  |
Recurring Fair Value Measurements | Level 1 |  |  |  |
Assets |  |  |  |
Total assets | 100,160 | 131,635 |  |
Recurring Fair Value Measurements | Level 1 | Money market funds |  |  |  |
Assets |  |  |  |
Money market funds | 100,160 | 131,635 |  |
Recurring Fair Value Measurements | Level 1 | U.S. treasuries |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 0 | 0 |  |
Recurring Fair Value Measurements | Level 1 | U.S. government agency securities |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 0 | 0 |  |
Recurring Fair Value Measurements | Level 1 | Corporate debt securities |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 0 | 0 |  |
Recurring Fair Value Measurements | Level 2 |  |  |  |
Assets |  |  |  |
Total assets | 644,660 | 599,477 |  |
Recurring Fair Value Measurements | Level 2 | Money market funds |  |  |  |
Assets |  |  |  |
Money market funds | 0 | 0 |  |
Recurring Fair Value Measurements | Level 2 | U.S. treasuries |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 170,325 | 74,237 |  |
Recurring Fair Value Measurements | Level 2 | U.S. government agency securities |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 167,859 | 216,688 |  |
Recurring Fair Value Measurements | Level 2 | Corporate debt securities |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 306,476 | 308,552 |  |
Recurring Fair Value Measurements | Level 3 |  |  |  |
Assets |  |  |  |
Total assets | 0 | 0 |  |
Recurring Fair Value Measurements | Level 3 | Money market funds |  |  |  |
Assets |  |  |  |
Money market funds | 0 | 0 |  |
Recurring Fair Value Measurements | Level 3 | U.S. treasuries |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 0 | 0 |  |
Recurring Fair Value Measurements | Level 3 | U.S. government agency securities |  |  |  |
Assets |  |  |  |
Available-for-sale debt securities | 0 | 0 |  |
Recurring Fair Value Measurements | Level 3 | Corporate debt securities |  |  |  |
Assets |  |  |  |
Available-for-sale debt 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/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: 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 7: 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 8: 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 9: 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/1943274/2147478546/942-210-S99-1 Reference 10: 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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