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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, 2025	Dec. 31, 2024
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	$ 626,003	$ 587,959
Money market fund
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	162,122	151,555
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	442,428	397,458
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	162,122	151,555
Significant Other Observable Inputs (Level 2)
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	183,575	190,501
U.S. Treasury notes
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	280,306	245,903
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	280,306	245,903
Government Sponsored Enterprises Securities [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	183,575	190,501
Government Sponsored Enterprises Securities [Member] | Significant Other Observable Inputs (Level 2)
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Investments, fair value disclosure	$ 183,575	$ 190,501

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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

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