Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 2,611,499	$ 1,703,130
Short-term investments	513,922	2,218,108
Accounts receivable, net of allowance for doubtful accounts of $3,758 and $3,427 at December 31, 2021 and 2020, respectively	154,937	69,940
Mortgage loans held for sale	106,753	330,758
Inventory	3,912,662	491,293
Prepaid expenses and other current assets	153,555	75,846
Restricted cash	226,651	75,805
Total current assets	7,679,979	4,964,880
Contract cost assets	35,465	50,719
Beneficial interests in securitizations	75,103	0
Property and equipment, net	214,555	196,152
Right of use assets	129,932	187,960
Goodwill	2,373,792	1,984,907
Intangible assets, net	180,072	94,767
Other assets	6,556	7,175
Total assets	10,695,454	7,486,560
Current liabilities:
Accounts payable	17,230	18,974
Accrued expenses and other current liabilities	161,459	94,487
Accrued compensation and benefits	108,464	47,666
Borrowings under credit facilities	2,311,556	670,209
Deferred revenue	51,484	48,995
Lease liabilities, current portion	23,503	28,310
Securitization term loans	1,208,753	0
Total current liabilities	3,882,449	908,641
Lease liabilities, net of current portion	147,967	207,723
Convertible senior notes	1,319,224	1,613,523
Other long-term liabilities	4,503	14,857
Total liabilities	5,354,143	2,744,744
Commitments and contingencies (Note 18)
Shareholders’ equity:
Preferred stock, $0.0001 par value; 30,000,000 shares authorized; no shares issued and outstanding	0	0
Additional paid-in capital	7,001,084	5,880,883
Accumulated other comprehensive income	7,234	164
Accumulated deficit	(1,667,032)	(1,139,255)
Total shareholders’ equity	5,341,311	4,741,816
Total liabilities and shareholders’ equity	10,695,454	7,486,560
Class A Common Stock
Shareholders’ equity:
Common stock/capital stock	6	6
Class B Common Stock
Shareholders’ equity:
Common stock/capital stock	1	1
Class C Capital Stock
Shareholders’ equity:
Common stock/capital stock	$ 18	$ 17