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Summary of Significant Accounting Policies - Schedule of Common Share Equivalents Included from Computation of Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net loss $ (9,817) $ (6,144) $ (25,700) $ (16,907)
Net loss per share, basic and diluted $ (0.66) $ (5.51) $ (1.73) $ (16.81)
Weighted-average number of common shares, basic and diluted 14,815,852 1,114,133 14,820,822 1,006,008