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Net Loss per Share - Summary of Potential Common Shares Excluded from Calculation of Diluted Net Loss per Share (Detail) - shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential common shares excluded from calculation of diluted net loss per share 22,310,820 17,600,909
Warrants to Purchase Common Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential common shares excluded from calculation of diluted net loss per share 12,935,323 12,935,323
Stock Options to Purchase Common Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential common shares excluded from calculation of diluted net loss per share 9,375,497 4,665,586