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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 6 Months Ended
Jul. 31, 2020
Apr. 30, 2020
Jul. 31, 2019
Apr. 30, 2019
Jul. 31, 2020
Jul. 31, 2019
Numerator            
Net loss $ (367) $ (1,066) $ (4,983) $ (4,740) $ (1,433) $ (9,723)
Denominator            
Weighted-average common shares 22,232,176   20,849,935   22,066,771 20,667,905
Basic and diluted net loss per share $ (0.02)   $ (0.24)   $ (0.06) $ (0.47)