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Fair Value Measurements - Fair Value Measurements of Cash Equivalents, Available-For-Sale Investment Securities and Equity Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | $ 291,635 | $ 395,597
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Financial liabilities, fair value disclosure | 1,114 | 898
Money market fund |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 43,908 | 72,578
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 85,998 | 95,703
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market fund |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 43,908 | 72,578
Significant Other Observable Inputs (Level 2) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 205,637 | 299,894
Significant Unobservable Inputs (Level 3) |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Financial liabilities, fair value disclosure | 1,114 | 898
U.S. Treasury notes |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 42,090 | 15,945
U.S. Treasury notes | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 42,090 | 15,945
Equity securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure |  | 7,180
Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure |  | 7,180
US Government Sponsored Enterprises Debt Securities [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 205,637 | 94,803
US Government Sponsored Enterprises Debt Securities [Member] | Significant Other Observable Inputs (Level 2) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 205,637 | 94,803
Municipal bonds |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure |  | 20,775
Municipal bonds | Significant Other Observable Inputs (Level 2) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure |  | 20,775
Commercial paper |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure |  | 184,316
Commercial paper | Significant Other Observable Inputs (Level 2) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure |  | 184,316
Cash awards | Cash |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Financial liabilities, fair value disclosure | 1,114 | 898
Cash awards | Significant Unobservable Inputs (Level 3) | Cash |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Financial liabilities, fair value disclosure | $ 1,114 | $ 898

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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + 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 + Details
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