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Net Loss per Share - Additional Information (Details) - shares
 12 Months Ended
Jun. 15, 2018
Jan. 31, 2021
Jan. 31, 2020
Jun. 14, 2018
Class Of Stock [Line Items]        
Common Stock, conversion features   On June 14, 2018, all of our outstanding shares of Class B common stock automatically converted into the same number of shares of Class A common stock pursuant to the terms of our Amended and Restated Certificate of Incorporation. No additional shares of Class B common stock will be issued following such conversion. The conversion occurred pursuant to Article IV of our Amended and Restated Certificate of Incorporation, which provided that each share of Class B common stock would convert automatically, without any further action, into one share of Class A common stock on the first trading day falling on or after the date on which the outstanding shares of Class B common stock represent less than 5% of the aggregate number of shares of the then outstanding Class A common stock and Class B common stock.    
Additional common shares issued   159,851,000 150,611,000  
Class B Common Stock        
Class Of Stock [Line Items]        
Maximum percentage of outstanding shares of Class A and Class B common stock, for automatic conversion of shares of Class B common stock       5.00%
Additional common shares issued       0
Reduction in number of authorized shares of common stock 200,000,000