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Common Stock and Stockholders' Equity - Shares Available for Issuance (Details) - shares
Apr. 30, 2021
Jan. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for grant (in shares) 15,344,651 13,060,282
Total common stock reserved at period end (in shares) 34,459,455  
Stock options, RSUs and PSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding stock options and unvested RSUs outstanding (in shares) 16,170,681  
Number of shares available for grant (in shares) 15,344,651  
ESPP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for grant (in shares) 2,944,123