Shareholders' Equity - Summary of Reserved Shares of Common Stock (Details)	Dec. 31, 2019 shares
Class Of Stock [Line Items]
Total shares of common stock reserved for future issuance	33,656,200
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	16,651,154
Grant | 2019 Plan
Class Of Stock [Line Items]
Total shares of common stock reserved for future issuance	15,396,254
Grant | Employee Stock Purchase Plan
Class Of Stock [Line Items]
Total shares of common stock reserved for future issuance	1,551,917
Conversion of Common Stock Warrant
Class Of Stock [Line Items]
Total shares of common stock reserved for future issuance	56,875