Property and Equipment, Net (Details) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Apr. 30, 2019 |
Apr. 30, 2018 |
Jan. 31, 2019 |
|
| Property, Plant and Equipment [Line Items] | |||
| Gross property and equipment | $ 13,499 | $ 11,138 | |
| Accumulated depreciation and amortization | (5,799) | (5,366) | |
| Property and equipment, net | 7,700 | 5,772 | |
| Depreciation and amortization | 400 | $ 400 | |
| Leasehold improvements | |||
| Property, Plant and Equipment [Line Items] | |||
| Gross property and equipment | 7,719 | 6,512 | |
| Computers and equipment | |||
| Property, Plant and Equipment [Line Items] | |||
| Gross property and equipment | 3,589 | 2,998 | |
| Capitalized internal-use software | |||
| Property, Plant and Equipment [Line Items] | |||
| Gross property and equipment | 389 | 389 | |
| Furniture and fixtures | |||
| Property, Plant and Equipment [Line Items] | |||
| Gross property and equipment | 1,802 | 1,239 | |
| Construction-in-progress | |||
| Property, Plant and Equipment [Line Items] | |||
| Gross property and equipment | $ 1,400 | $ 200 | |