CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Common stock, par value (in dollars per share) $ 0.0001 $ 0.00001
Common stock, Shares Authorized (in shares) 3,000,000,000 485,262,910
Common stock, Shares Issued (in shares) 540,714,692 83,748,443
Common stock, Shares Outstanding (in shares) 540,714,692 83,748,443
Cash and cash equivalents $ 1,412,665,000 $ 405,080,000
Restricted cash 92,863,000 279,742,000
Real estate inventory, net 465,936,000 1,312,369,000
Escrow receivable 1,494,000 13,882,000
Other 24,987,000 30,879,000
Other current assets carried at fair value 373,000 100,000
Property and equipment 29,228,000 34,606,000
Other assets 4,097,000 5,394,000
Total assets 2,175,582,000 2,231,684,000
Accounts payable and other accrued liabilities ($6,440 and $0 carried at fair value) 25,270,000 32,977,000
Interest payable 1,081,000 5,808,000
Current portion of credit facilities and other secured borrowings 346,322,000 1,074,125,000
Credit facilities, net of current portion 135,467,000 221,929,000
Total liabilities 575,575,000 1,583,285,000
Variable interest entities ("VIEs")    
Cash and cash equivalents 15,849,000 86,526,000
Restricted cash 81,408,000 268,368,000
Real estate inventory, net 460,680,000 1,312,194,000
Escrow receivable 1,364,000 13,798,000
Other assets 5,365,000 11,995,000
Total assets 564,666,000 1,692,881,000
Accounts payable and other accrued liabilities ($6,440 and $0 carried at fair value) 2,335,000 9,199,000
Interest payable 1,059,000 5,784,000
Current portion of credit facilities and other secured borrowings 339,173,000 1,042,984,000
Credit facilities, net of current portion 135,467,000 221,929,000
Total liabilities $ 478,034,000 $ 1,279,896,000
Series A convertible preferred stock    
Shares Authorized (in shares) 0 40,089,513
Shares Issued (in shares) 0 40,089,513
Shares Outstanding (in shares) 0 40,089,513
Liquidation preference $ 0 $ 9,807,000
Series B convertible preferred stock    
Shares Authorized (in shares) 0 23,840,816
Shares Issued (in shares) 0 23,840,816
Shares Outstanding (in shares) 0 23,840,816
Liquidation preference $ 0 $ 20,182,000
Series C convertible preferred stock    
Shares Authorized (in shares) 0 29,070,700
Shares Issued (in shares) 0 29,070,700
Shares Outstanding (in shares) 0 29,070,700
Liquidation preference $ 0 $ 77,160,000
Series D convertible preferred stock    
Shares Authorized (in shares) 0 63,956,147
Shares Issued (in shares) 0 63,470,884
Shares Outstanding (in shares) 0 63,470,884
Liquidation preference $ 0 $ 248,333,000
Series E convertible preferred stock    
Shares Authorized (in shares) 0 165,941,619
Shares Issued (in shares) 0 157,952,523
Shares Outstanding (in shares) 0 157,952,523
Liquidation preference $ 0 $ 1,011,319