Significant Customers and Geographic Information - Additional Information (Details) - Customer	Oct. 31, 2019	Jan. 31, 2019
Accounts Receivable | Customer
Concentration Risk [Line Items]
Number of customers comprising 10% or more of total accounts receivable	0	0
Revenue | Customer
Concentration Risk [Line Items]
Number of customers comprising more than 10% of revenues	0	0
Revenue | Geographic Concentration Risk | Foreign Countries
Concentration Risk [Line Items]
Number of customers comprising more than 10% of revenues	0	0