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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	Mar. 31, 2022	Dec. 31, 2021
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	$ 438,512	$ 499,785
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Financial liabilities, fair value disclosure	1,497	603
Money market fund
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	193,477	122,876
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	295,117	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	193,477	122,876
Significant Other Observable Inputs (Level 2)
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	143,395	233,084
Significant Unobservable Inputs (Level 3)
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Financial liabilities, fair value disclosure	1,497	603
U.S. Treasury notes
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	97,662	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	97,662	140,187
Equity securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	3,978	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	3,978	3,638
US Government Sponsored Enterprises Debt Securities [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	49,366	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	49,366	49,474
Municipal bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	21,056	25,984
Municipal bonds | Significant Other Observable Inputs (Level 2)
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	21,056	25,984
Commercial paper
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	72,973	157,626
Commercial paper | Significant Other Observable Inputs (Level 2)
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	72,973	157,626
Cash awards
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Financial liabilities, fair value disclosure	1,497	603
Cash awards | Significant Unobservable Inputs (Level 3)
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Financial liabilities, fair value disclosure	$ 1,497	$ 603

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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.

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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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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