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Convertible Preferred Stock - Schedule of Convertible Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Feb. 28, 2019
Dec. 31, 2018
Class Of Stock [Line Items]                  
Shares Authorized 185,432,719     174,237,067          
Shares Issued 118,766,273     118,766,273          
Shares Outstanding 118,766,273     118,766,273          
Defined Original Issue Price $ 0.001     $ 0.001          
Liquidation Preference $ 202,582     $ 202,582          
Series H                  
Class Of Stock [Line Items]                  
Shares Authorized 53,031,883                
Shares Issued 23,923,188           8,695,621 8,695,621  
Shares Outstanding 23,923,188 23,923,000 23,923,000 23,923,000 23,923,000 23,923,000 23,923,000   15,228,000
Defined Original Issue Price $ 1.15           $ 1.15 $ 1.15  
Liquidation Preference $ 27,512                
Series G                  
Class Of Stock [Line Items]                  
Shares Authorized 76,464,035                
Shares Issued 46,146,517                
Shares Outstanding 46,146,517 46,147,000 46,147,000 46,147,000 46,147,000 46,147,000 46,147,000   46,147,000
Defined Original Issue Price $ 0.75                
Liquidation Preference $ 34,610                
Series F Preferred Stock                  
Class Of Stock [Line Items]                  
Shares Authorized 19,468,203                
Shares Issued 19,468,203                
Shares Outstanding 19,468,203 19,468,000 19,468,000 19,468,000 19,468,000 19,468,000 19,468,000   19,468,000
Defined Original Issue Price $ 1.50                
Liquidation Preference $ 29,202                
Series E                  
Class Of Stock [Line Items]                  
Shares Authorized 13,972,954                
Shares Issued 7,639,556                
Shares Outstanding 7,639,556 7,640,000 7,640,000 7,640,000 7,640,000 7,640,000 7,640,000   7,640,000
Defined Original Issue Price $ 5.00                
Liquidation Preference $ 38,198                
Series D                  
Class Of Stock [Line Items]                  
Shares Authorized 11,781,710                
Shares Issued 10,874,876                
Shares Outstanding 10,874,876 10,875,000 10,875,000 10,875,000 10,875,000 10,875,000 10,875,000   10,875,000
Defined Original Issue Price $ 4.00                
Liquidation Preference $ 43,499                
Series C                  
Class Of Stock [Line Items]                  
Shares Authorized 2,356,597                
Shares Issued 2,356,596                
Shares Outstanding 2,356,596 2,357,000 2,357,000 2,357,000 2,357,000 2,357,000 2,357,000   2,357,000
Defined Original Issue Price $ 3.00                
Liquidation Preference $ 7,070                
Series B‑1                  
Class Of Stock [Line Items]                  
Shares Authorized 2,998,852                
Shares Issued 2,998,852                
Shares Outstanding 2,998,852 2,999,000 2,999,000 2,999,000 2,999,000 2,999,000 2,999,000   2,999,000
Defined Original Issue Price $ 3.20                
Liquidation Preference $ 9,596                
Series B                  
Class Of Stock [Line Items]                  
Shares Authorized 3,641,817                
Shares Issued 3,641,817                
Shares Outstanding 3,641,817 3,642,000 3,642,000 3,642,000 3,642,000 3,642,000 3,642,000   3,642,000
Defined Original Issue Price $ 2.75                
Liquidation Preference $ 10,015                
Series A‑3                  
Class Of Stock [Line Items]                  
Shares Authorized 750,000                
Shares Issued 750,000                
Shares Outstanding 750,000 750,000 750,000 750,000 750,000 750,000 750,000   750,000
Defined Original Issue Price $ 2.24                
Liquidation Preference $ 1,680                
Series A‑2                  
Class Of Stock [Line Items]                  
Shares Authorized 266,668                
Shares Issued 266,668                
Shares Outstanding 266,668 267,000 267,000 267,000 267,000 267,000 267,000   267,000
Defined Original Issue Price $ 1.50                
Liquidation Preference $ 400                
Series A‑1                  
Class Of Stock [Line Items]                  
Shares Authorized 700,000                
Shares Issued 700,000                
Shares Outstanding 700,000 700,000 700,000 700,000 700,000 700,000 700,000   700,000
Defined Original Issue Price $ 1.14                
Liquidation Preference $ 800