v3.26.1
Fair Value Measurements - Fair Value Measurements of Cash Equivalents, Available-For-Sale Investment Securities and Equity Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investments, fair value disclosure $ 751,942 $ 666,825
Money market fund    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investments, fair value disclosure 170,503 24,834
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investments, fair value disclosure 561,947 455,385
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 170,503 24,834
Significant Other Observable Inputs (Level 2)    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investments, fair value disclosure 189,995 211,440
U.S. Treasury notes    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investments, fair value disclosure 391,444 430,551
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 391,444 430,551
Government Sponsored Enterprises Securities [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investments, fair value disclosure 189,995 211,440
Government Sponsored Enterprises Securities [Member] | Significant Other Observable Inputs (Level 2)    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investments, fair value disclosure $ 189,995 $ 211,440