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Organization, Liquidity and Management's Plan, and Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Securities Not Included in Calculation of Diluted Net Loss per Share (Detail) - shares
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded in calculation of diluted net loss per share 7,076,121 5,560,565
Common stock warrants [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded in calculation of diluted net loss per share 14,587 487,087
Restricted stock units [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded in calculation of diluted net loss per share 1,770,582 962,299
Common stock subject to repurchase [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded in calculation of diluted net loss per share 183,095 183,095
Common stock options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded in calculation of diluted net loss per share 5,107,857 3,928,084