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Shareholders' Equity - Summary of Reserved Shares of Common Stock (Details)
Sep. 30, 2021
shares
Class Of Stock [Line Items]  
Total shares of common stock reserved for future issuance 39,460,774
Exercise of Outstanding Common Stock Options and Vesting of Outstanding Common Restricted Stock Units Granted  
Class Of Stock [Line Items]  
Total shares of common stock reserved for future issuance 13,645,411
Grant | 2019 Equity Incentive Plan  
Class Of Stock [Line Items]  
Total shares of common stock reserved for future issuance 23,011,065
Grant | Employee Stock Purchase Plan  
Class Of Stock [Line Items]  
Total shares of common stock reserved for future issuance 2,804,298