v3.26.1
Stock-Based Compensation - Summary of Company's Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
$ / shares
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Number of Options    
Beginning balance (in shares) | shares 31,294,637  
Granted (in shares) | shares 5,577,017  
Exercised (in shares) | shares (9,322,163)  
Forfeited/cancelled (in shares) | shares (507,472)  
Ending balance (in shares) | shares 27,042,019 31,294,637
Weighted Avg Exercise Price    
Beginning balance (in usd per share) | $ / shares $ 0.66  
Granted (in usd per share) | $ / shares 13.21  
Exercised (in usd per share) | $ / shares 0.51  
Forfeited/cancelled (in usd per share) | $ / shares 9.42  
Ending balance (in usd per share) | $ / shares $ 3.14 $ 0.66
Stock Options Additional Disclosures    
Weighted average remaining contractual life 7 years 4 months 2 days 6 years 3 months 14 days
Aggregate intrinsic value, beginning balance | $ $ 203,535  
Aggregate intrinsic value, ending balance | $ $ 275,706 $ 203,535
Number of options, exercisable (in shares) | shares 17,975,356  
Weighted average exercise price, exercisable (in usd per share) | $ / shares $ 0.92  
Weighted average remaining contractual life, exercisable 6 years 6 months 18 days  
Aggregate intrinsic value, exercisable | $ $ 222,895