Annual report pursuant to Section 13 and 15(d)

Net Loss Per Share of Common Stock - Schedule of Antidilutive Securities Excluded from Computation of Diluted Weighted Average Shares Outstanding (Detail)

v3.20.1
Net Loss Per Share of Common Stock - Schedule of Antidilutive Securities Excluded from Computation of Diluted Weighted Average Shares Outstanding (Detail) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potentially antidilutive securities outstanding excluded from the computation of diluted weighted average shares 4,250,248 3,843,091 4,247,025
Employee Stock Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potentially antidilutive securities outstanding excluded from the computation of diluted weighted average shares 1,216,338 718,788 620,015
Warrants [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potentially antidilutive securities outstanding excluded from the computation of diluted weighted average shares 3,033,910 3,124,303 3,627,010