v3.20.4
Stockholders' Deficit- Summary of Total Authorized, Issued, And Outstanding Shares (Detail) - shares
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Class of Stock [Line Items]      
Common stock, shares authorized 22,701,005,000   4,000,000,000
Common stock, shares issued 1,792,139,544   587,889,687
Common stock, shares outstanding 1,792,139,544   581,497,116
Common Class A [Member]      
Class of Stock [Line Items]      
Common stock, shares authorized 20,000,000,000 20,000,000,000 2,200,000,000
Common stock, shares issued 1,542,057,292   315,615,753
Common stock, shares outstanding 1,542,057,292   309,223,182
Common Class B [Member]      
Class of Stock [Line Items]      
Common stock, shares authorized 2,700,000,000 2,700,000,000 1,800,000,000
Common stock, shares issued 249,077,252   272,273,934
Common stock, shares outstanding 249,077,252   272,273,934
Common Class F [Member]      
Class of Stock [Line Items]      
Common stock, shares authorized 1,005,000 1,005,000 0
Common stock, shares issued 1,005,000   0
Common stock, shares outstanding 1,005,000   0