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Basic and Diluted Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share of Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Numerator    
Net loss $ (4,740) $ (3,685)
Denominator    
Weighted-average common shares 20,479,739 19,318,718
Basic and diluted net loss per share $ (0.23) $ (0.19)