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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities    
Net income (loss) $ 61,605,000 $ (247,721,000)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 57,882,000 55,199,000
Share-based compensation 152,068,000 96,146,000
Amortization of right of use assets 12,902,000 12,731,000
Amortization of contract cost assets 20,188,000 17,070,000
Amortization of debt discount and debt issuance costs 50,372,000 47,746,000
Gain (loss) on extinguishment of debt 2,334,000 (6,391,000)
Impairment costs 0 76,800,000
Deferred income taxes 0 (8,549,000)
Other adjustments to reconcile net income (loss) to cash provided by (used in) operating activities 8,271,000 (975,000)
Changes in operating assets and liabilities:    
Accounts receivable (32,811,000) (1,487,000)
Mortgage loans held for sale 159,308,000 (38,514,000)
Inventory (677,746,000) 701,145,000
Prepaid expenses and other assets (35,788,000) (771,000)
Contract cost assets (17,407,000) (19,608,000)
Lease liabilities (14,179,000) (495,000)
Accounts payable 2,676,000 7,504,000
Accrued expenses and other current liabilities 80,819,000 (8,741,000)
Accrued compensation and benefits 7,898,000 (3,285,000)
Deferred revenue 4,552,000 4,767,000
Other long-term liabilities (446,000) 10,049,000
Net cash provided by (used in) operating activities (157,502,000) 692,620,000
Investing activities    
Proceeds from maturities of investments 1,329,552,000 701,266,000
Proceeds from sales of investments 0 116,394,000
Purchases of investments 0 (1,026,233,000)
Purchases of property and equipment (24,137,000) (54,653,000)
Purchases of intangible assets (10,407,000) (11,408,000)
Proceeds from sale of equity investment 0 10,000,000
Net cash provided by (used in) investing activities 1,295,008,000 (264,634,000)
Financing activities    
Proceeds from issuance of convertible senior notes, net of issuance costs 0 553,282,000
Proceeds from issuance of Class C capital stock, net of issuance costs 544,557,000 411,522,000
Proceeds from borrowings on credit facilities 610,118,000 43,200,000
Repayments of borrowings on credit facilities (146,839,000) (617,506,000)
Net borrowings (repayments) on warehouse line of credit and repurchase agreements 0 39,387,000
Repurchase of convertible senior notes (145,656,000) (194,670,000)
Proceeds from exercise of stock options 75,685,000 184,984,000
Value of equity awards withheld for tax liability (126,000) 0
Net cash provided by financing activities 937,739,000 420,199,000
Net increase in cash, cash equivalents and restricted cash during period 2,075,245,000 848,185,000
Cash, cash equivalents and restricted cash at beginning of period 1,778,935,000 1,230,909,000
Cash, cash equivalents and restricted cash at end of period 3,854,180,000 2,079,094,000
Supplemental disclosures of cash flow information    
Cash paid for interest 27,773,000 29,201,000
Noncash transactions:    
Capitalized share-based compensation 8,665,000 8,490,000
Write-off of fully depreciated property and equipment 24,345,000 6,942,000
Write-off of fully amortized intangible assets 3,782,000 0
Property and equipment purchased on account $ 1,352,000 $ 5,305,000