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Stock Based Compensation - Summary of Option Activity Under Company's Equity Incentive Plans (Detail)
 6 Months Ended 12 Months Ended
Jun. 30, 2023
$ / shares
shares
Dec. 31, 2022
$ / shares
shares
Number of Shares Underlying Outstanding Options    
Number of Shares Underlying Outstanding Options, Beginning Balance | shares 8,678,767  
Number of Shares Underlying Outstanding Options, Options granted | shares 14,008,093 [1]  
Number of Shares Underlying Outstanding Options, Options exercised | shares (215,067)  
Number of Shares Underlying Outstanding Options, Options forfeited and cancelled | shares (14,210,119) [1]  
Number of Shares Underlying Outstanding Options, Options expired | shares (14,729)  
Number of Shares Underlying Outstanding Options, Ending Balance | shares 8,246,945 8,678,767
Number of Shares Underlying Outstanding Options, Exercisable- June 30, 2023 | shares 7,412,252  
Weighted- Average Exercise Price    
Weighted- Average Exercise Price, Beginning Balance | $ / shares $ 1.42  
Weighted- Average Exercise Price, Options granted | $ / shares 0.86 [1]  
Weighted- Average Exercise Price, Options Exercised | $ / shares 0.1  
Weighted- Average Exercise Price, Options forfeited and cancelled | $ / shares 0.91 [1]  
Weighted- Average Exercise Price, Options expired | $ / shares 34.33  
Weighted- Average Exercise Price, Ending Balance | $ / shares 1.32 $ 1.42
Weighted- Average Exercise Price, Exercisable - June 30, 2023 | $ / shares $ 1.39  
Weighted-Average Remaining Contractual Term (Years)    
Weighted-Average Remaining Contractual Term (Years), Outstanding Balance 5 years 8 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.