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Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |
Total assets | $ 698,494 | $ 594,809
Money Market Funds |  |
Assets |  |
Total assets | 131,837 | 172,418
U.S. Treasuries |  |
Assets |  |
Total assets | 51,589 | 42,308
U.S. Government Agency Securities |  |
Assets |  |
Total assets | 189,312 | 88,032
Corporate Debt Securities |  |
Assets |  |
Total assets | 325,756 | 292,051
Fair Value, Inputs, Level 1 |  |
Assets |  |
Total assets | 131,837 | 172,418
Fair Value, Inputs, Level 1 | Money Market Funds |  |
Assets |  |
Total assets | 131,837 | 172,418
Fair Value, Inputs, Level 1 | U.S. Treasuries |  |
Assets |  |
Total assets | 0 | 0
Fair Value, Inputs, Level 1 | U.S. Government Agency Securities |  |
Assets |  |
Total assets | 0 | 0
Fair Value, Inputs, Level 1 | Corporate Debt Securities |  |
Assets |  |
Total assets | 0 | 0
Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 566,657 | 422,391
Fair Value, Inputs, Level 2 | Money Market Funds |  |
Assets |  |
Total assets | 0 | 0
Fair Value, Inputs, Level 2 | U.S. Treasuries |  |
Assets |  |
Total assets | 51,589 | 42,308
Fair Value, Inputs, Level 2 | U.S. Government Agency Securities |  |
Assets |  |
Total assets | 189,312 | 88,032
Fair Value, Inputs, Level 2 | Corporate Debt Securities |  |
Assets |  |
Total assets | 325,756 | 292,051
Fair Value, Inputs, Level 3 |  |
Assets |  |
Total assets | 0 | 0
Fair Value, Inputs, Level 3 | Money Market Funds |  |
Assets |  |
Total assets | 0 | 0
Fair Value, Inputs, Level 3 | U.S. Treasuries |  |
Assets |  |
Total assets | 0 | 0
Fair Value, Inputs, Level 3 | U.S. Government Agency Securities |  |
Assets |  |
Total assets | 0 | 0
Fair Value, Inputs, Level 3 | Corporate Debt Securities |  |
Assets |  |
Total assets | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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