Net and Comprehensive Loss Per Share Attributable to Common Stockholders - Schedule of Weighted Average Common Stock Equivalents Excluded from Calculation of Basic and Diluted Net and Comprehensive Loss per Share (Detail) - Weighted Average [Member] - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Options to Purchase Common Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total amount of anti-dilutive securities excluded from computation of earnings per share	4,485,326	4,771,960
Warrants to Purchase Common Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total amount of anti-dilutive securities excluded from computation of earnings per share	600,000	600,000