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Stockholders' Equity - Stock Incentive Plan - 2019 Equity Incentive Plan (Details) - 2019 Equity Incentive Plan
Oct. 31, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Maximum number of shares (in shares) 19,198,875
Maximum number of shares, new shares (in shares) 2,640,031
Maximum number of shares, additional shares (in shares) 16,558,844