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Stock Based Compensation - Summary of Option Activity Under Company's Equity Incentive Plans (Detail) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Number of Shares Underlying Outstanding Options    
Number of Shares Underlying Outstanding Options, Beginning Balance 8,678,767  
Number of Shares Underlying Outstanding Options, Options granted [1] 14,008,093  
Number of Shares Underlying Outstanding Options, Options exercised (215,067)  
Number of Shares Underlying Outstanding Options, Options forfeited and cancelled [1] (14,210,119)  
Number of Shares Underlying Outstanding Options, Options expired (14,729)  
Number of Shares Underlying Outstanding Options, Ending Balance 8,246,945 8,678,767
Number of Shares Underlying Outstanding Options, Exercisable- June 30, 2023 7,609,393  
Weighted- Average Exercise Price    
Weighted- Average Exercise Price, Beginning Balance $ 1.42  
Weighted- Average Exercise Price, Options granted [1] 0.86  
Weighted- Average Exercise Price, Options Exercised 0.1  
Weighted- Average Exercise Price, Options forfeited and cancelled [1] 0.91  
Weighted- Average Exercise Price, Options expired 34.33  
Weighted- Average Exercise Price, Ending Balance 1.32 $ 1.42
Weighted- Average Exercise Price, Exercisable - June 30, 2023 $ 1.37  
Weighted-Average Remaining Contractual Term (Years)    
Weighted-Average Remaining Contractual Term (Years), Outstanding Balance 5 years 5 months 4 days 7 years 5 months 19 days
[1] Includes options that were cancelled and re-granted as part of the option modification from the special cash dividend, as further discussed above.