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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, 2024 | Dec. 31, 2023
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | $ 484,174 | $ 314,794
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Financial liabilities, fair value disclosure |  | 4,506
Money market fund |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 51,642 | 64,586
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 314,864 | 139,920
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 | 51,642 | 64,586
Significant Other Observable Inputs (Level 2) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 169,310 | 174,874
Significant Unobservable Inputs (Level 3) |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Financial liabilities, fair value disclosure |  | 4,506
U.S. Treasury notes |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 263,222 | 75,334
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 | 263,222 | 75,334
Government Sponsored Enterprises Securities [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 169,310 | 174,874
Government Sponsored Enterprises Securities [Member] | Significant Other Observable Inputs (Level 2) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | $ 169,310 | 174,874
Cash awards | Cash |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Financial liabilities, fair value disclosure |  | 4,506
Cash awards | Significant Unobservable Inputs (Level 3) | Cash |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Financial liabilities, fair value disclosure |  | $ 4,506

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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -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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- 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/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -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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