Net Loss Per Share - Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended | |
|---|---|---|
Apr. 30, 2019 |
Apr. 30, 2018 |
|
| Numerator: | ||
| Net loss | $ (12,064) | $ (6,579) |
| Denominator: | ||
| Weighted-average shares used in calculating net loss per share, basic and diluted (in shares) | 32,510 | 20,878 |
| Net loss per share, basic and diluted (in dollars per share) | $ (0.37) | $ (0.32) |