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Stock Based Compensation - Summary of Option Activity Under Company's 2018 Plan (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Number of Shares Underlying Outstanding Options    
Number of Shares Underlying Outstanding Options, Beginning Balance 2,603,630  
Number of Shares Underlying Outstanding Options, Options granted [1] 10,270,911  
Number of Shares Underlying Outstanding Options, Options forfeited and cancelled [1] (4,148,455)  
Number of Shares Underlying Outstanding Options, Options expired (47,319)  
Number of Shares Underlying Outstanding Options, Ending Balance 8,678,767 2,603,630
Number of Shares Underlying Outstanding Options, Exercisable- December 31, 2022 4,317,076  
Weighted- Average Exercise Price    
Weighted- Average Exercise Price, Beginning Balance $ 7.70  
Weighted- Average Exercise Price, Options granted [1] 1.34  
Weighted- Average Exercise Price, Options forfeited and cancelled [1] 4.96  
Weighted- Average Exercise Price, Options expired 13.27  
Weighted- Average Exercise Price, Ending Balance 1.42 $ 7.70
Weighted- Average Exercise Price, Exercisable - December 31, 2022 $ 2.38  
Weighted-Average Remaining Contractual Term (Years)    
Weighted-Average Remaining Contractual Term (Years), Outstanding Balance 7 years 5 months 19 days 7 years 5 months 15 days
Weighted Average Remaining Contractual Term, Exercisable - December 31, 2022 5 years 11 months 8 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Outstanding $ 1,051  
[1] Includes options that were cancelled and re-granted as part of the option modification from the special cash dividend, as further discussed above.