Summary of Significant Accounting Policies - Property and Equipment (Details) |
12 Months Ended |
---|---|
Jan. 31, 2019 | |
Computer equipment and software | Minimum | |
Property, Plant and Equipment [Line Items] | |
Estimated useful lives of property and equipment | 2 years |
Computer equipment and software | Maximum | |
Property, Plant and Equipment [Line Items] | |
Estimated useful lives of property and equipment | 3 years |
Furniture, vehicles and office equipment | |
Property, Plant and Equipment [Line Items] | |
Estimated useful lives of property and equipment | 3 years |