Common Stock - Summary of Reserved Shares of Common Stock (Details)	Sep. 30, 2020 shares
Class Of Stock [Line Items]
Common stock, capital shares reserved for future issuance	56,475,053
Series A Preferred
Class Of Stock [Line Items]
Common stock, capital shares reserved for future issuance	20,000,000
Series B Preferred
Class Of Stock [Line Items]
Common stock, capital shares reserved for future issuance	7,592,830
Series C Preferred
Class Of Stock [Line Items]
Common stock, capital shares reserved for future issuance	6,052,617
Series D Preferred
Class Of Stock [Line Items]
Common stock, capital shares reserved for future issuance	15,313,382
Outstanding options
Class Of Stock [Line Items]
Common stock, capital shares reserved for future issuance	7,001,747
Options available for future grant
Class Of Stock [Line Items]
Common stock, capital shares reserved for future issuance	514,477