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Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator:    
Net loss used to compute basic and diluted net loss per share $ (687) $ (5,823)
Denominator:    
Weighted-average shares used to compute basic and diluted net loss per share (in shares) 51,181,160 42,823,427
Net loss per share:    
Basic and diluted (in dollars per share) $ (0.01) $ (0.14)