Net Loss per Share - Schedule of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | |
|---|---|---|
Apr. 30, 2019 |
Apr. 30, 2018 |
|
| Numerator: | ||
| Net loss | $ (33,240) | $ (26,555) |
| Denominator: | ||
| Weighted-average shares used to compute net loss per share, basic and diluted (in shares) | 54,710,746 | 50,350,052 |
| Net loss per share, basic and diluted (in dollars per share) | $ (0.61) | $ (0.53) |