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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
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net loss $ (8,499) $ (8,177)
Net loss per share, basic and diluted $ (0.57) $ (8.52)
Weighted-average number of common shares, basic and diluted 14,831,049 959,285