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Net Loss Per Share - Schedule of Earnings Per Share, Basic and Diluted (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]      
Net loss $ (44,836) $ (39,612) $ (27,897)
Weighted average shares outstanding - basic and diluted 33,882,406 32,805,684 30,683,421
Basic and diluted loss per share $ (1.32) $ (1.21) $ (0.91)
Anti-dilutive stock options, restricted stock units and performance stock units 5,522,418 5,606,552 4,253,301