Net Loss per Share - Summary of Securities Not Included in Diluted Per Share Calculations (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities not included in the diluted per share calculations, amount	5,431,572	4,861,652	5,431,572	4,861,652
Options 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	980,883	691,001	980,883	691,001
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	4,450,689	4,170,651	4,450,689	4,170,651