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Equity Incentive Plans - Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Share-Based Payment Arrangement [Abstract]    
Number of shares, Beginning balance | shares 9,208,970  
Number of shares, Stock options granted | shares 4,710,324  
Number of shares, Stock options exercised | shares (248,907)  
Number of shares, Stock options forfeited | shares (912,703)  
Number of shares, Ending balance | shares 12,757,684 9,208,970
Number of shares, Exercisable | shares 6,429,000  
Weighted- average exercise price per share, Beginning balance | $ / shares $ 10.31  
Weighted- average exercise price per share, Stock options granted | $ / shares 5.7  
Weighted- average exercise price per share, Stock options exercised | $ / shares 3.69  
Weighted- average exercise price per share, Stock options forfeited | $ / shares 10.96  
Weighted- average exercise price per share, Ending balance | $ / shares 8.69 $ 10.31
Weighted- average exercise price per share, Exercisable | $ / shares $ 11.22  
Weighted- average remaining contractual term 7 years 9 months 14 days 7 years 6 months 10 days
Weighted- average remaining contractual term, Exercisable 6 years 6 months 18 days  
Aggregate intrinsic value | $ $ 8,435 $ 2,930
Aggregate intrinsic value, Exercisable | $ $ 4,278