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Net Loss per Share - Summary of Securities Not Included in Diluted Per Share Calculations (Detail) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities not included in the diluted per share calculations, amount 8,090,039 4,832,352
Option to Purchase Common Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities not included in the diluted per share calculations, amount 889,759 661,701
Warrants to Purchase Common Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities not included in the diluted per share calculations, amount 7,200,280 4,170,651