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Net Loss per Share - Computation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Earnings Per Share [Abstract]          
Net loss $ (9,794) $ (7,384) $ (18,165) $ (15,857) $ (32,800)
Weighted average common shares used in net loss per share attributable to common stockholders, basic and diluted 20,123,461 17,835,952 19,772,201 17,835,261  
Basic and diluted net loss per common share outstanding $ (0.49) $ (0.41) $ (0.92) $ (0.89)