v3.26.3
Fair Value Measurements - Schedule of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities, fair value $ 2,062,446 $ 1,611,823
Recurring Basis [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total 2,276,569 1,975,828
Recurring Basis [Member] | Cash [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents 161,633 295,412
Recurring Basis [Member] | Money Market Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents 30,394 37,255
Recurring Basis [Member] | Commercial Paper [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents   14,892
Marketable securities, fair value 59,286 49,460
Recurring Basis [Member] | Corporate Debt Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities, fair value 1,377,384 1,155,965
Recurring Basis [Member] | Certificates and Term Deposits [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities, fair value 322,236  
Recurring Basis [Member] | Certificates of Deposit [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities, fair value   101,100
Recurring Basis [Member] | Government-sponsored Enterprise Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities, fair value 303,540 305,298
Recurring Basis [Member] | Corporate Equity Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities, fair value 22,096 16,446
Recurring Basis [Member] | Level 1 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total 209,464 332,667
Recurring Basis [Member] | Level 1 [Member] | Cash [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents 161,633 295,412
Recurring Basis [Member] | Level 1 [Member] | Money Market Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents 30,394 37,255
Recurring Basis [Member] | Level 1 [Member] | Corporate Equity Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities, fair value 17,437  
Recurring Basis [Member] | Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total 2,067,105 1,643,161
Recurring Basis [Member] | Level 2 [Member] | Commercial Paper [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents   14,892
Marketable securities, fair value 59,286 49,460
Recurring Basis [Member] | Level 2 [Member] | Corporate Debt Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities, fair value 1,377,384 1,155,965
Recurring Basis [Member] | Level 2 [Member] | Certificates and Term Deposits [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities, fair value 322,236  
Recurring Basis [Member] | Level 2 [Member] | Certificates of Deposit [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities, fair value   101,100
Recurring Basis [Member] | Level 2 [Member] | Government-sponsored Enterprise Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities, fair value 303,540 305,298
Recurring Basis [Member] | Level 2 [Member] | Corporate Equity Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable securities, fair value $ 4,659 16,446
Recurring Basis [Member] | Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total   $ 0