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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 | Jun. 30, 2022 | Dec. 31, 2021
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | $ 417,886 | $ 499,785
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Financial liabilities, fair value disclosure | 694 | 603
Money market fund |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 92,926 | 122,876
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 163,883 | 266,701
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 | 92,926 | 122,876
Significant Other Observable Inputs (Level 2) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 254,003 | 233,084
Significant Unobservable Inputs (Level 3) |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Financial liabilities, fair value disclosure | 694 | 603
U.S. Treasury notes |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 67,476 | 140,187
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 | 67,476 | 140,187
Equity securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 3,481 | 3,638
Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 3,481 | 3,638
US Government Sponsored Enterprises Debt Securities [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 65,377 | 49,474
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 | 65,377 | 49,474
Municipal bonds |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 25,802 | 25,984
Municipal bonds | Significant Other Observable Inputs (Level 2) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 25,802 | 25,984
Commercial paper |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 162,824 | 157,626
Commercial paper | Significant Other Observable Inputs (Level 2) |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Investments, fair value disclosure | 162,824 | 157,626
Cash awards |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Financial liabilities, fair value disclosure | 694 | 603
Cash awards | Significant Unobservable Inputs (Level 3) |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Financial liabilities, fair value disclosure | $ 694 | $ 603

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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