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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Share-Based Payment Arrangement [Abstract]    
Options outstanding beginning balance, Shares Subject to Stock Options 5,114,754  
Granted, Shares Subject to Stock Options 1,191,896  
Exercised, Shares Subject to Stock Options (96,796)  
Forfeited, Shares Subject to Stock Options 0  
Cancelled, Shares Subject to Stock Options (219,839)  
Options outstanding ending balance, Shares Subject to Stock Options 5,990,015 5,114,754
Options exercisable, Shares Subject to Stock Options 3,798,158  
Options outstanding beginning balance, Weighted-Average Exercise Price $ 14.18  
Granted, Weighted-Average Exercise Price 33.21  
Exercised, Weighted-Average Exercise Price 11.37  
Forfeited, Weighted-Average Exercise Price 0  
Cancelled, Weighted-Average Exercise Price 19.09  
Options outstanding ending balance, Weighted-Average Exercise Price 17.83 $ 14.18
Options exercisable, Weighted-Average Exercise Price $ 12.03  
Options outstanding, Weighted-Average Remaining Contractual Term 6 years 10 months 2 days 6 years 7 months 28 days
Options exercisable, Weighted-Average Remaining Contractual Term 5 years 10 months 2 days  
Options outstanding, Aggregate Intrinsic Value $ 131 $ 114
Options exercisable, Aggregate Intrinsic Value $ 104