v3.20.1
Summary of Significant Accounting Policies - Concentration of Credit Risk (Details)
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Channel partner A | Customer Concentration Risk | Accounts Receivable      
Concentration Risk [Line Items]      
Concentration risk, percentage 11.00% 9.00%  
Channel partner A | Distributor Concentration Risk | Revenue Benchmark      
Concentration Risk [Line Items]      
Concentration risk, percentage 10.00% 15.00% 15.00%
Channel partner B | Customer Concentration Risk | Accounts Receivable      
Concentration Risk [Line Items]      
Concentration risk, percentage 10.00% 2.00%  
Customer A | Customer Concentration Risk | Accounts Receivable      
Concentration Risk [Line Items]      
Concentration risk, percentage 0.00% 10.00%  
Customer B | Customer Concentration Risk | Accounts Receivable      
Concentration Risk [Line Items]      
Concentration risk, percentage 20.00% 19.00%