v3.25.3
Investments - Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]    
Short-term investments, Estimated Fair Value $ 454,378 $ 502,933
Fair Value Measurements on Recurring Basis    
Schedule Of Available For Sale Securities [Line Items]    
Cash equivalents, Amortized Cost 46,640  
Cash equivalents, Estimated Fair Value 46,640  
Short-term investments, Amortized Cost 453,460 502,169
Short-term investments, Unrealized Gains 924 766
Short-term investments, Unrealized Losses (6) (2)
Short-term investments, Estimated Fair Value 454,378 502,933
Cash equivalents and Short-term investments, Amortized Cost 500,100 702,193
Cash equivalents and Short-term investments, Unrealized Gains 924 766
Cash equivalents and Short-term investments, Unrealized Losses (6) (2)
Cash equivalents and Short-term investments, Estimated Fair Value 501,018 702,957
Fair Value Measurements on Recurring Basis | Money Market Funds    
Schedule Of Available For Sale Securities [Line Items]    
Cash equivalents, Amortized Cost 39,180 200,024
Cash equivalents, Estimated Fair Value $ 39,180 $ 200,024
Fair Value Measurements on Recurring Basis | Money Market Funds | Maximum    
Schedule Of Available For Sale Securities [Line Items]    
Maturities (years) 1 year 1 year
Fair Value Measurements on Recurring Basis | U.S. Treasury Securities    
Schedule Of Available For Sale Securities [Line Items]    
Cash equivalents, Amortized Cost $ 7,460  
Cash equivalents, Estimated Fair Value 7,460  
Short-term investments, Amortized Cost 420,960 $ 497,172
Short-term investments, Unrealized Gains 915 766
Short-term investments, Unrealized Losses (1)  
Short-term investments, Estimated Fair Value $ 421,874 $ 497,938
Fair Value Measurements on Recurring Basis | U.S. Treasury Securities | Maximum    
Schedule Of Available For Sale Securities [Line Items]    
Maturities (years) 1 year  
Maturities (years) 2 years 3 years
Fair Value Measurements on Recurring Basis | U.S. Agency Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Short-term investments, Amortized Cost $ 32,500 $ 4,997
Short-term investments, Unrealized Gains 9  
Short-term investments, Unrealized Losses (5) (2)
Short-term investments, Estimated Fair Value $ 32,504 $ 4,995
Fair Value Measurements on Recurring Basis | U.S. Agency Bonds | Maximum    
Schedule Of Available For Sale Securities [Line Items]    
Maturities (years) 3 years 3 years