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, 2018 |
Apr. 30, 2017 |
|
| Earnings Per Share [Abstract] | ||
| Net loss | $ (29,164) | $ (19,690) |
| Weighted-average shares used to compute net loss per share, basic and diluted (in shares) | 50,350,052 | 13,164,559 |
| Net loss per share, basic and diluted (in dollars per share) | $ (0.58) | $ (1.50) |