Opendoor (OPEN) 10-Q 12 May 21 2021 Q1 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended
	Mar. 31, 2021	May 05, 2021
Class of Stock [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-39253
Entity Registrant Name	Opendoor Technologies Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	98-1515020
Entity Address, Address Line One	410 N. Scottsdale Road,
Entity Address, Address Line Two	Suite 1600
Entity Address, City or Town	Tempe,
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85281
City Area Code	415
Local Phone Number	896-6737
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		577,694,841
Entity Central Index Key	0001801169
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Common Stock Warrants
Class of Stock [Line Items]
Title of 12(b) Security	Common stock, $0.0001 par value per share
Trading Symbol	OPEN
Security Exchange Name	NASDAQ
Warrants
Class of Stock [Line Items]
Title of 12(b) Security	Warrants to purchase common stock
Trading Symbol	OPENW
Security Exchange Name	NASDAQ

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents		$ 2,039,876	$ 1,412,665
Restricted cash		143,311	92,863
Marketable securities		58,619	47,637
Mortgage loans held for sale pledged under agreements to repurchase		8,307	7,529
Escrow receivable		19,264	1,494
Real estate inventory, net		840,632	465,936
Other current assets ($414 and $373 carried at fair value)		33,292	24,987
Total current assets		3,143,301	2,053,111
PROPERTY AND EQUIPMENT – Net		31,042	29,228
RIGHT OF USE ASSETS		47,114	49,517
GOODWILL		30,945	30,945
INTANGIBLES – Net		8,104	8,684
OTHER ASSETS ($10,000 and $0 carried at fair value)		11,206	4,097
TOTAL ASSETS	[1]	3,271,712	2,175,582
CURRENT LIABILITIES:
Accounts payable and other accrued liabilities		41,413	25,270
Current portion of credit facilities and other secured borrowings		596,563	346,322
Interest payable		1,228	1,081
Lease liabilities, current portion		4,490	20,716
Total current liabilities		643,694	393,389
CREDIT FACILITIES – Net of current portion		136,473	135,467
WARRANT LIABILITIES		62,621	47,349
LEASE LIABILITIES – Net of current portion		45,241	46,625
OTHER LIABILITIES		122	94
Total liabilities	[2]	888,151	622,924
Commitments and Contingencies
SHAREHOLDERS’ EQUITY:
Common stock, $0.0001 par value; 3,000,000,000 shares authorized; 585,691,729 and 540,714,692 shares issued and outstanding, respectively		58	54
Additional paid-in capital		3,697,382	2,596,012
Accumulated deficit		(1,313,885)	(1,043,449)
Accumulated other comprehensive income		6	41
Total shareholders’ equity		2,383,561	1,552,658
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY		3,271,712	2,175,582
Variable Interest Entity, Primary Beneficiary
CURRENT ASSETS:
Cash and cash equivalents		9,108	15,849
Restricted cash		133,887	81,408
Escrow receivable		18,839	1,364
Real estate inventory, net		820,961	460,680
Other current assets ($414 and $373 carried at fair value)		10,220	5,365
TOTAL ASSETS		993,015	564,666
CURRENT LIABILITIES:
Accounts payable and other accrued liabilities		4,090	2,335
Current portion of credit facilities and other secured borrowings		588,774	339,173
Interest payable		1,220	1,059
CREDIT FACILITIES – Net of current portion		136,473	135,467
Total liabilities		$ 730,557	$ 478,034
[1]	The Company’s consolidated assets at March 31, 2021 and December 31, 2020 include the following assets of certain variable interest entities (“VIEs”) that can only be used to settle the liabilities of those VIEs: Cash and cash equivalents, $9,108 and $15,849; Restricted cash, $133,887 and $81,408; Real estate inventory, net, $820,961 and $460,680; Escrow receivable, $18,839 and $1,364; Other current assets, $10,220 and $5,365; and Total assets of $993,015 and $564,666, respectively.
[2]	The Company’s consolidated liabilities at March 31, 2021 and December 31, 2020 include the following liabilities for which the VIE creditors do not have recourse to Opendoor: Accounts payable and other accrued liabilities, $4,090 and $2,335; Interest payable, $1,220 and $1,059; Current portion of credit facilities and other secured borrowings, $588,774 and $339,173; Credit facilities, net of current portion, $136,473 and $135,467; and Total liabilities, $730,557 and $478,034, respectively.

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Other current assets, carried at fair value	$ 414	$ 373
Other assets, carried at fair value	$ 10,000	$ 0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock authorized (in shares)	3,000,000,000	3,000,000,000
Common stock issued (in dollars per share)	585,691,729	585,691,729
Common stock outstanding (in dollars per share)	540,714,692	540,714,692

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
REVENUE	$ 747,274	$ 1,255,795
COST OF REVENUE	650,142	1,164,748
GROSS PROFIT	97,132	91,047
OPERATING EXPENSES:
Sales, marketing and operations	69,066	81,689
General and administrative	222,084	29,583
Technology and development	50,677	15,787
Total operating expenses	341,827	127,059
LOSS FROM OPERATIONS	(244,695)	(36,012)
DERIVATIVE AND WARRANT FAIR VALUE ADJUSTMENT	(15,272)	(1,012)
INTEREST EXPENSE	(10,999)	(27,727)
OTHER INCOME – Net	624	2,675
LOSS BEFORE INCOME TAXES	(270,342)	(62,076)
INCOME TAX EXPENSE	(94)	(120)
NET LOSS	$ (270,436)	$ (62,196)
Net loss per share attributable to common shareholders:
Basic (in dollars per share)	$ (0.48)	$ (0.74)
Diluted (in dollars per share)	$ (0.48)	$ (0.74)
Weighted-average shares outstanding:
Basic (in shares)	565,381	84,027
Diluted (in shares)	565,381	84,027

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Other Comprehensive Income [Abstract]
NET LOSS	$ (270,436)	$ (62,196)
OTHER COMPREHENSIVE INCOME:
Unrealized loss on marketable securities	(35)	(299)
COMPREHENSIVE LOSS	$ (270,471)	$ (62,495)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN TEMPORARY EQUITY AND SHAREHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Restricted Shares	RSUs	Previously Reported	Common Stock	Common StockRestricted Shares	Common StockRSUs	Additional Paid-in Capital	Additional Paid-in CapitalRestricted Shares	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Series A Convertible Preferred Stock	Series B Convertible Preferred Stock	Series C Convertible Preferred Stock	Series D Convertible Preferred Stock	Series E Convertible Preferred Stock
Temporary equity, shares outstanding, beginning balance (in shares) at Dec. 31, 2019												40,089,513	23,840,816	29,070,700	63,470,884	157,952,523
Temporary equity, beginning balance at Dec. 31, 2019												$ 9,763	$ 20,049	$ 80,519	$ 257,951	$ 1,013,220
Temporary equity, shares outstanding, ending balance (in shares) at Mar. 31, 2020												40,089,513	23,840,816	29,070,700	63,470,884	157,952,523
Temporary equity, ending balance at Mar. 31, 2020												$ 9,763	$ 20,049	$ 80,519	$ 257,951	$ 1,013,220
Shares outstanding, beginning balance (in shares) at Dec. 31, 2019					83,748,443
Shareholders' deficit, beginning balance at Dec. 31, 2019	$ (733,103)				$ 0			$ 57,362		$ (790,483)	$ 18
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock (in shares)					441,326
Vesting of restricted stock	36							36
Exercise of stock options (in shares)					237,548
Exercise of stock options	426							426
Stock-based compensation	2,970							2,970		0
Other comprehensive loss	(299)										(299)
Net loss	(62,196)									(62,196)
Shares outstanding, ending balance (in shares) at Mar. 31, 2020					84,427,317
Shareholders' deficit, ending balance at Mar. 31, 2020	(792,166)				$ 0			60,794		(852,679)	(281)
Temporary equity, shares outstanding, beginning balance (in shares) at Dec. 31, 2020												0	0	0	0	0
Temporary equity, beginning balance at Dec. 31, 2020												$ 0	$ 0	$ 0	$ 0	$ 0
Temporary equity, shares outstanding, ending balance (in shares) at Mar. 31, 2021												0	0	0	0	0
Temporary equity, ending balance at Mar. 31, 2021												$ 0	$ 0	$ 0	$ 0	$ 0
Shares outstanding, beginning balance (in shares) at Dec. 31, 2020					540,714,692
Shareholders' deficit, beginning balance at Dec. 31, 2020	1,552,658			$ 1,600,007	$ 54			2,596,012		(1,043,449)	41
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock (in shares)					32,817,421
Issuance of stock	$ 857,222				$ 3			857,219
Vesting of restricted stock (in shares)						331,227	11,736,872
Vesting of restricted stock		$ 16	$ 1				$ 1		$ 16
Exercise of stock options (in shares)	99,000				91,517
Exercise of stock options	$ 266							266
Stock-based compensation	243,869							243,869
Other comprehensive loss	(35)										(35)
Net loss	(270,436)									(270,436)
Shares outstanding, ending balance (in shares) at Mar. 31, 2021					585,691,729
Shareholders' deficit, ending balance at Mar. 31, 2021	$ 2,383,561				$ 58			$ 3,697,382		$ (1,313,885)	$ 6

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
NET LOSS	$ (270,436)	$ (62,196)
Adjustments to reconcile net loss to cash, cash equivalents, and restricted cash (used in) provided by operating activities:
Depreciation and amortization – net of accretion	10,302	9,522
Amortization of right of use asset	2,457	3,660
Stock-based compensation	238,832	2,970
Derivative and warrant fair value adjustment	15,272	1,012
Gain on settlement of lease liabilities	(5,237)	0
Inventory valuation adjustment	20	6,221
Changes in fair value of derivative instruments	(41)	(44)
Payment-in-kind interest	0	1,349
Net fair value adjustments and gain (loss) on sale of mortgage loans held for sale	(977)	(355)
Origination of mortgage loans held for sale	(32,082)	(17,658)
Proceeds from sale and principal collections of mortgage loans held for sale	32,281	15,453
Changes in operating assets and liabilities:
Escrow receivable	(17,770)	(826)
Real estate inventories	(374,665)	480,170
Other assets	(9,128)	6,379
Accounts payable and other accrued liabilities	15,680	(4,597)
Interest payable	344	(1,590)
Lease liabilities	(9,559)	(3,088)
Net cash (used in) provided by operating activities	(404,707)	436,382
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(4,141)	(5,684)
Purchase of marketable securities	(34,583)	(69,778)
Proceeds from sales, maturities, redemptions and paydowns of marketable securities	23,437	20,310
Purchase of non-marketable equity securities	(10,000)	0
Net cash used in investing activities	(25,287)	(55,152)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	250	411
Proceeds from the February 2021 Offering	886,067	0
Issuance cost of common stock	(28,848)	0
Proceeds from credit facilities and other secured borrowings	704,047	662,268
Principal payments on credit facilities and other secured borrowings	(453,806)	(1,008,407)
Payment of loan origination fees and debt issuance costs	(57)	(1,187)
Net cash provided by (used in) financing activities	1,107,653	(346,915)
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	677,659	34,315
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH – Beginning of period	1,505,528	684,822
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH – End of period	2,183,187	719,137
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION – Cash paid during the period for interest	9,091	25,186
RECONCILIATION TO CONDENSED CONSOLIDATED BALANCE SHEETS:
Cash and cash equivalents	2,039,876	409,257
Restricted cash	$ 143,311	$ 309,880

DESCRIPTION OF BUSINESS AND ACC

DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES	DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES Description of Business Opendoor Technologies Inc. (the “Company” and “Opendoor”) including its consolidated subsidiaries and certain variable interest entities (“VIEs”), is a leading digital platform for buying and selling homes. Opendoor streamlines the home selling and buying transaction and creates an end-to-end experience online. Since its inception through March 31, 2021, the Company had completed approximately 90,000 home transactions. As of March 31, 2021, the Company operated in 27 markets across the United States. The Company was incorporated in Delaware on December 30, 2013. Correction of Prior Period Amounts On April 12, 2021, subsequent to the filing of the Company’s Annual Report on Form 10-K for the year ended December 31, 2020, the Acting Director of the Division of Corporation Finance and the Acting Chief Accountant of the SEC issued a Staff Statement (the “Staff Statement”) on Accounting and Reporting Considerations for Warrants Issued by Special Purpose Acquisition Companies (“SPACs”). The Company took into consideration the guidance in the Staff Statement and Accounting Standards Codification 815-40, Derivatives and Hedging-Contracts in Entity’s Own Equity ("ASC 815-40") and evaluated the Public and Sponsor Warrants (each as defined herein and collectively the "Warrants"). The Warrants were issued in a private placement simultaneously with the closing of the initial public offering of Social Capital Hedosophia Holdings Corp. II (“SCH”), assumed by the Company through the Business Combination (as defined herein) on December 18, 2020, and classified in shareholders' equity as of and for the year ended December 31, 2020. While the Company concluded the Public Warrants meet the criteria to continue to be classified in shareholders' equity, the Company concluded the Sponsor Warrants do not meet the scope exception from derivative accounting prescribed by ASC 815-40 and should therefore be recorded as a liability on the Company’s consolidated balance sheet at fair value as of the closing of the Business Combination, with subsequent changes in their fair value recognized in the Company’s consolidated statement of operations at each reporting date. The accounting for the Sponsor Warrants does not impact the Company's financial statements in any reporting periods prior to the Business Combination, as the Company assumed the Warrants through the Business Combination which was accounted for as a reverse recapitalization. The fair value of the Sponsor Warrants as of the Closing Date on December 18, 2020 and December 31, 2020 amounted to $81.1 million and $47.3 million, respectively. The change in fair value from the Closing Date through December 31, 2020 amounted to a gain of $33.8 million. The impact of the misstatement as of December 31, 2020 resulted in an understatement of the private warrants liability of $47.3 million, and an overstatement of accumulated deficit and additional paid-in capital of $33.8 million and $81.1 million respectively. The Company evaluated the impact of error related to the accounting treatment of Sponsor Warrants with respect to the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 and determined, based on consideration of quantitative and qualitative factors, that the error had an immaterial impact, individually and in aggregate. As such, the Company is correcting its accounting for Sponsor Warrants in this Quarterly Report on Form 10-Q. The following table provides the impact of the correction on the Company's Condensed Consolidated Balance Sheet as of December 31, 2020, as presented herein (in thousands): Previously Stated Adjustments As Corrected Warrant liabilities $ — 47,349 $ 47,349 Total liabilities $ 575,575 47,349 $ 622,924 Additional paid-in capital $ 2,677,155 (81,143) $ 2,596,012 Accumulated deficit (1,077,243) 33,794 (1,043,449) Total shareholders' equity $ 1,600,007 (47,349) $ 1,552,658 Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared pursuant to generally accepted accounting principles in the United States of America (“GAAP”). The condensed consolidated financial statements as of March 31, 2021 and December 31, 2020 and for the three month periods ended March 31, 2021 and 2020 include the accounts of Opendoor, its wholly owned subsidiaries and VIEs where the Company is the primary beneficiary. The accompanying unaudited consolidated financial statements reflect all adjustments which are, in the opinion of management, necessary to a fair statement of the results for the interim periods presented. All significant intercompany accounts and transactions have been eliminated in the consolidated financial statements herein. As a result of the Business Combination completed on December 18, 2020, prior period share and per share amounts presented in the accompanying consolidated financial statements and these related notes have been retroactively converted. See “ Note 2— Business Combination” for additional information. The accompanying interim condensed consolidated financial statements and these related notes should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (“Annual Report”) filed on March 4, 2021. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results may differ materially from such estimates. Significant estimates, assumptions and judgments made by management include, among others, the determination of the fair value of common stock, share-based awards, warrants, derivatives, convertible notes, and inventory impairment (“real estate inventory valuation adjustment”). Management believes that the estimates and judgments upon which they rely are reasonable based upon information available to them at the time that these estimates and judgments are made. To the extent that there are material differences between these estimates and actual results, the Company’s financial statements will be affected. The COVID-19 pandemic introduced significant additional uncertainties with respect to estimates, judgments and assumptions, which may materially impact these estimates. Significant Risks and Uncertainties The Company operates in a dynamic industry and, accordingly, can be affected by a variety of factors. For example, the Company believes that changes in any of the following areas could have a significant negative effect on the Company in terms of its future financial position, results of operations or cash flows: public health crises, like the COVID-19 pandemic; its rates of revenue growth; its ability to manage advertising inventory or pricing; engagement and usage of its products; the effectiveness of its investment of resources to pursue strategies; competition in its market; the stability of the residential real estate market; the impact of interest rate changes on demand and its costs; changes in technology, products, markets or services by the Company or its competitors; the addition or loss of significant customers; its ability to maintain or establish relationships with listings and data providers; its ability to obtain or maintain licenses and permits to support its current and future businesses; actual or anticipated changes to its products and services; changes in government regulation affecting its business; the outcomes of legal proceedings; natural disasters and catastrophic events; scaling and adaptation of existing technology and network infrastructure; its management of its growth; its ability to attract and retain qualified employees and key personnel; its ability to successfully integrate and realize the benefits of its past or future strategic acquisitions or investments; the protection of customers’ information and other privacy concerns; the protection of its brand and intellectual property; and intellectual property infringement and other claims, among other things. Concentrations of Credit Risk Financial instruments, which potentially subject the Company to concentrations of credit risk, consist primarily of cash and cash equivalents, investments in marketable securities, and mortgage loans held for sale pledged under agreements to repurchase (“MLHFS”). The Company places cash and cash equivalents and investments with major financial institutions, which management assesses to be of high credit quality, in order to limit exposure of the Company’s investments. Similarly, the Company’s credit risk on mortgage loans held for sale is mitigated due to a large number of customers. Further, the Company’s credit risk on mortgage loans held for sale is mitigated by the fact that the Company typically sells mortgages on the secondary market within a relatively short period of time after which the Company’s exposure is limited to borrower defaults within the initial few months of the mortgage. The Company’s significant accounting policies are discussed in “Part II – Item 8 – Financial Statements and Supplementary Data – Note 1. Description of Business and Accounting Policies” in the Annual Report. There have been no changes to these significant accounting policies for the three month period ended March 31, 2021, except as noted below. Derivative Instruments The Company’s derivative instruments are comprised of interest rate caps, interest rate lock commitments (“IRLCs”), and embedded conversion options related to the convertible notes. The Company’s derivative instruments are freestanding in nature and some are utilized as economic hedges. These derivative instruments are recorded at fair value with changes recognized as a gain or loss to operations. Beginning in 2021, the Company changed the fair value classification of IRLCs from Level 2 to Level 3 as the Company began to adjust observable input data for the estimated pull-through rate, a Company specific input that is unobservable to market participants. See “Note 5 — Derivative Instruments” and " Note 8 — Fair Value Disclosures " for further discussion. Non-marketable equity securities Our non-marketable equity securities are strategic investments in a privately held company. Non-marketable equity securities are investments that do not have a readily determinable fair value, which are measured at cost minus impairment, if any, adjusted for changes resulting from observable price changes in orderly transactions for an identical or similar investment in the same issuer (the “Measurement Alternative”). All gains and losses on these investments, realized and unrealized, are recorded in Other income-net on our consolidated statements of operations. We assess whether an impairment loss on our non-marketable equity securities has occurred due to declines in fair value or other market conditions. If any impairment is identified for non-marketable equity securities, we write down the investment to its fair value. Impairment of Long-Lived Assets Long-lived assets, such as property and equipment and definite-lived intangible assets, among other long-term assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If circumstances require a long-lived asset or asset group be tested for possible impairment, the Company first compares undiscounted cash flows expected to be generated by that asset or asset group to its carrying amount. If the carrying amount of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment loss is recognized to the extent the carrying amount of the underlying asset exceeds its fair value. Impairment loss of $2.6 million was recognized for the three months ended March 31, 2021. Of this amount, $1.9 million and $0.7 million are included in Technology and development and General and administrative, respectively. There were no impairment charges recognized during the three months ended March 31, 2020. The impairment loss recognized for the three months ended March 31, 2021 is related to abandonment of property and equipment and sublease of certain right of use assets. Public and Sponsor Warrants On April 30, 2020, SCH consummated its initial public offering of 41,400,000 units, consisting of one share of Class A common stock and one third of one warrant exercisable for Class A common stock, at a price of $10.00 per unit. Each whole warrant entitles the holder to purchase one share of Class A common stock at an exercise price of $11.50 per share (the “Public Warrants”). Simultaneously with the closing of the IPO, SCH completed the private sale of 6,133,333 warrants to SCH’s sponsor at a price of $1.50 per warrant (the “Sponsor Warrants”). Each Sponsor Warrant allows the sponsor to purchase one share of Class A common stock at $11.50 per share. As of December 31, 2020, there were 19,933,333 warrants outstanding. The Sponsor Warrants and shares of common stock issuable upon the exercise of Sponsor Warrants may not be transferred, assigned, or sold until 30 days after the completion of a Business Combination. Additionally, the Sponsor Warrants are eligible for cash and cashless exercises, at the holder’s option, and are redeemable only if the reference value, as defined in the Warrant Agreement, is less than $18.00 per share. If the Sponsor Warrants are held by someone other than the sponsors and certain permitted transferees, the Sponsor Warrants will be redeemable and exercisable on the same basis as the Public Warrants. The Company evaluated the Public and Sponsor Warrants under ASC 815-40, Derivatives and Hedging-Contracts in Entity’s Own Equity , and concluded that the Sponsor Warrants do not meet the criteria to be classified in shareholders’ equity. Specifically, the exercise and settlement features for the Sponsor Warrants preclude them from being considered indexed to the Company’s own stock, given that a change in the holder of the Sponsor Warrants may alter the settlement of the Sponsor Warrants. Since the holder of the instrument is not an input to a standard option pricing model (a consideration with respect to the indexation guidance), the fact that a change in the holder may impact the value of the Sponsor Warrants means the Sponsor Warrants are not indexed to the Company’s own stock. Since the Private Warrants meet the definition of a derivative under ASC 815, the Company recorded these warrants as liabilities on the balance sheet at fair value upon the consummation of the Business Combination, with subsequent changes in their respective fair values recognized in the consolidated statement of operations at each reporting period. The Company concluded that the Public Warrants, which do not have the same exercise and settlement features as the Sponsor Warrants, meet the criteria to be classified in shareholders' equity. Recently Issued Accounting Standards Recently Adopted Accounting Standards In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes (Topic 740). ASU 2019-12 eliminates certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. It also clarifies and simplifies other aspects of the accounting for income taxes. This guidance is effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. The Company adopted this ASU as of January 1, 2021 and the adoption of this ASU did not have a material impact to the Company’s consolidated financial statements given that the Company has a full valuation allowance and the scenarios for which the guidance offer simplification are not significant for the Company. Recently Issued Accounting Standards Not Yet Adopted In March 2020, the FASB issued ASU 2020-04 which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions that reference the London Inter- Bank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued because of reference rate reform. This guidance is optional for a limited period of time to ease the potential burden in accounting for, or recognizing the effects of, reference rate reform on financial reporting. This guidance is effective from March 12, 2020 through December 31, 2022. Entities may elect to adopt the amendments for contract modifications as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020, or prospectively from a date within an interim period that includes or is subsequent to March 12, 2020, up to the date that the financial statements are available to be issued. The Company may elect to take advantage of this optional guidance in its transition away from LIBOR within certain debt contracts. While the goal of the reference rate reform transition is for it to be economically neutral to entities, the Company has not yet adopted this standard nor has the Company determined the impact the adoption of this guidance will have on the Company’s financial position, results of operations or cash flows.

BUSINESS COMBINATION

BUSINESS COMBINATION	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
BUSINESS COMBINATION	BUSINESS COMBINATIONOpendoor Labs Inc. entered into a merger agreement (the “Merger Agreement”) with Social Capital Hedosophia Holdings Corp. II, (“SCH”) on September 15, 2020. Pursuant to the Merger Agreement, Hestia Merger Sub Inc., a newly formed subsidiary of SCH (“Merger Sub”), merged with and into Opendoor Labs Inc. Upon the completion of the transactions contemplated by the terms of the Merger Agreement (the “Closing”) on December 18, 2020, the separate corporate existence of Merger Sub ceased and Opendoor Labs Inc. survived the merger and became a wholly owned subsidiary of SCH. On December 18, 2020, SCH also filed a notice of deregistration with the Cayman Islands Registrar of Companies, together with the necessary accompanying documents, and filed a certificate of incorporation and a certificate of corporate domestication with the Secretary of State of the State of Delaware, under which SCH was domesticated as a Delaware corporation, changing its name from “Social Capital Hedosophia Holdings Corp. II” to “Opendoor Technologies Inc.” These transactions are collectively referred to as the “Business Combination.” The Business Combination was accounted for as a reverse recapitalization whereby SCH was determined as the accounting acquiree and Opendoor Labs Inc. as the accounting acquirer. This accounting treatment is equivalent to Opendoor Labs Inc. issuing stock for the net assets of SCH, accompanied by a recapitalization whereby no goodwill or other intangible assets are recorded. Operations prior to the Business Combination are those of Opendoor Labs Inc. At the Closing, the Company received consideration of $376.6 million in cash as a result of the reverse recapitalization. In connection with the Business Combination, SCH entered into subscription agreements with certain investors, whereby it issued 60,005,000 shares of common stock at $10.00 per share (“PIPE Shares”) for an aggregate purchase price of $600.1 million (“PIPE Investment”), which closed simultaneously with the consummation of the Business Combination. Upon the Closing, the PIPE Shares were automatically converted into shares of the Company's common stock on a one-for-one basis. Upon the Closing, holders of Opendoor Labs Inc. common stock received shares of Opendoor Technologies common stock in an amount determined by application of the exchange ratio of 1.618 (“Exchange Ratio”), which was based on Opendoor Labs Inc.’s implied price per share prior to the Business Combination. For periods prior to the Business Combination, the reported share and per share amounts have been retroactively converted (“Retroactive Conversion”) by applying the Exchange Ratio. In connection with the Business Combination, the Company incurred approximately $43.6 million of equity issuance costs, consisting of underwriting, legal, and other professional fees, which are recorded to additional paid-in capital as a reduction of proceeds.

REAL ESTATE INVENTORY

REAL ESTATE INVENTORY	3 Months Ended
	Mar. 31, 2021
Inventory Disclosure [Abstract]
REAL ESTATE INVENTORY	REAL ESTATE INVENTORY The following table presents the components of inventory, net of applicable real estate inventory valuation adjustments, as of the dates presented (in thousands): March 31, December 31, Work-in-process $ 206,943 $ 183,004 Finished goods 633,689 282,932 Total real estate inventory $ 840,632 $ 465,936

CASH, CASH EQUIVALENTS, AND INV

CASH, CASH EQUIVALENTS, AND INVESTMENTS	3 Months Ended
	Mar. 31, 2021
Cash and Cash Equivalents [Abstract]
CASH, CASH EQUIVALENTS, AND INVESTMENTS	CASH, CASH EQUIVALENTS, AND INVESTMENTS The amortized cost, gross unrealized gains and losses, and fair value of cash, cash equivalents, and marketable securities as of March 31, 2021 and December 31, 2020, are as follows (in thousands): March 31, 2021 Cost Basis Unrealized Gains Unrealized Losses Fair Value Cash and Cash Equivalents Marketable Securities Cash $ 718,476 $ — $ — $ 718,476 $ 718,476 $ — Money market funds 1,252,134 — — 1,252,134 1,252,134 — Commercial paper 83,881 3 — 83,884 60,244 23,640 Corporate debt securities 30,209 8 (9) 30,208 9,022 21,186 U.S. agency securities 6,996 3 — 6,999 — 6,999 Asset-backed securities 6,792 6 (4) 6,794 — 6,794 Total $ 2,098,488 $ 20 $ (13) $ 2,098,495 $ 2,039,876 $ 58,619 December 31, 2020 Cost Basis Unrealized Gains Unrealized Losses Fair Value Cash and Cash Equivalents Marketable Securities Cash $ 709,924 $ — $ — $ 709,924 $ 709,924 $ — Money market funds 618,197 — — 618,197 618,197 — Commercial paper 81,037 1 — 81,038 81,038 — Corporate debt securities 29,891 26 (2) 29,915 3,506 26,409 Asset-backed securities 12,518 19 (4) 12,533 — 12,533 U.S. agency securities 6,993 2 — 6,995 — 6,995 U.S. Treasury securities 1,700 — — 1,700 — 1,700 Total $ 1,460,260 $ 48 $ (6) $ 1,460,302 $ 1,412,665 $ 47,637 A summary of debt securities with unrealized losses aggregated by period of continuous unrealized loss is as follows (in thousands): Less than 12 Months 12 Months or Greater Total March 31, 2021 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Commercial paper $ 26,595 $ — $ — $ — $ 26,595 $ — Corporate debt securities 22,450 (9) $ — $ — 22,450 (9) Asset-backed securities 3,277 (4) $ — $ — 3,277 (4) Total $ 52,322 $ (13) $ — $ — $ 52,322 $ (13) Less than 12 Months 12 Months or Greater Total December 31, 2020 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Commercial paper $ 19,296 $ — $ — $ — $ 19,296 $ — Corporate debt securities 7,538 (2) $ — $ — 7,538 (2) Asset-backed securities 4,611 (4) $ — $ — 4,611 (4) Total $ 31,445 $ (6) $ — $ — $ 31,445 $ (6) The scheduled contractual maturities of debt securities as of March 31, 2021 are as follows (in thousands): March 31, 2021 Fair Value Within 1 Year After 1 Year through 5 Years Commercial paper $ 83,884 $ 83,884 $ — Corporate-debt securities 30,208 30,208 — U.S. agency securities 6,999 6,999 — Asset-backed securities 6,794 6,794 — Total $ 127,885 $ 127,885 $ —

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS	DERIVATIVE INSTRUMENTS The Company uses certain types of derivative instruments in the normal course of business and the Company’s use of derivatives includes interest rate caps to manage interest rate risk, IRLCs with respect to our MLHFS, and embedded conversion options with respect to the Company’s convertible notes. Derivative transactions can be measured in terms of notional amount, but this amount is not recorded on the balance sheet and is not, when viewed in isolation, a meaningful measure of the risk profile of the instruments. The notional amount is generally not exchanged, but is used only as the basis on which interest and other payments are determined. Interest Rate Caps The Company uses free-standing derivative instruments in the normal course of business as economic hedges to manage interest rate risks with respect to its variable senior revolving credit facilities. The interest rate caps were carried at fair value in Other current assets with changes in fair value included in Other income. The Company’s interest rate cap position expired in November 2020. Interest Rate Lock Commitments In originating mortgage loans, the Company enters into IRLCs with prospective borrowers which are freestanding derivative instruments. IRLCs are a commitment that binds the Company, subject to loan underwriting and approval process, to fund the loan at a specified interest rate, regardless of fluctuations in the market interest rates between commitment date and funding date. The interest rate risk associated with the fluctuations in market interest rates between commitment date and funding date with respect to IRLCs is mitigated as the Company operates under the best effort basis whereby at the time of commitment, the Company enters into a sales commitment with a third-party for the same prospective loan. The fair value of interest rate lock commitments is presented in Other current assets. The change in fair value on IRLCs is a component of Other revenue. Embedded Conversion Options In connection with the Company’s issuance of convertible notes in 2019 (the “Convertible Notes”), the Company bifurcated the embedded conversion features associated with the Convertible Notes. The Convertible Notes and the related bifurcated embedded conversion options were extinguished in September 2020. Prior to extinguishment, the embedded conversion options were measured at fair value and were presented in Derivative and warrant liabilities. The change in fair value of the embedded conversion options is a component of Derivative and warrant fair value adjustment. The following table presents the total notional amounts and fair values for the Company’s derivatives (in thousands): Notional Amount Fair Value Derivatives March 31, 2021 Asset Liability Interest rate lock commitments $ 17,958 $ 414 $ — Notional Amount Fair Value Derivatives December 31, 2020 Asset Liability Interest rate lock commitments $ 15,130 $ 373 $ — The following table presents the net gains and losses recognized on derivatives within the respective line items in the statement of operations for the periods indicated (in thousands): Three Months Ended March 31, 2021 2020 Revenue $ 41 $ 48 Other income, net $ — $ (4)

VARIABLE INTEREST ENTITIES

VARIABLE INTEREST ENTITIES	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
VARIABLE INTEREST ENTITIES	VARIABLE INTEREST ENTITIES The Company utilizes VIEs in the normal course of business to support the Company’s financing needs. The Company determines whether the Company is the primary beneficiary of a VIE at the time it becomes involved with the VIE and reconsiders that conclusion on an on-going basis. The Company established certain special purpose entities (“SPEs”) for the purpose of financing the Company’s purchase and renovation of real estate inventory through the issuance of senior revolving credit facility debt and mezzanine term debt. The Company is the primary beneficiary of the various VIEs within these financing structures and consolidates these VIEs. The Company is determined to be the primary beneficiary based on its power to direct the activities that most significantly impact the economic outcomes of the SPEs through its role in designing the SPEs and managing the real estate inventory they purchase and sell. The Company has a potentially significant variable interest in the entities based upon the equity interest the Company holds in the VIEs. The following table summarizes the assets and liabilities related to the VIEs consolidated by the Company as of March 31, 2021 and December 31, 2020 (in thousands): March 31, December 31, Assets Cash and cash equivalents $ 9,108 $ 15,849 Restricted cash 133,887 81,408 Real estate inventory 820,961 460,680 Other (1) 29,059 6,729 Total assets $ 993,015 $ 564,666 Liabilities Credit facilities $ 725,247 $ 474,640 Other (2) 5,310 3,394 Total liabilities $ 730,557 $ 478,034 ________________ (1) Includes escrow receivable and other current assets. (2) Includes accounts payable and other accrued liabilities and interest payable. The creditors of the VIEs generally do not have recourse to the Company’s general credit solely by virtue of being creditors of the VIEs, with the exception of limited guarantees provided by an Opendoor subsidiary for credit facilities. See “Note 7 — Credit Facilities and Long-Term Debt” for further discussion of the recourse obligations with respect to the VIEs.

CREDIT FACILITIES AND LONG-TERM

CREDIT FACILITIES AND LONG-TERM DEBT	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
CREDIT FACILITIES AND LONG-TERM DEBT	CREDIT FACILITIES AND LONG-TERM DEBT Non-Recourse Asset-backed Financing Facilities The Company utilizes inventory financing facilities consisting of asset-backed senior revolving credit facilities and asset-backed mezzanine term debt facilities to provide financing for the Company’s real estate inventory purchases and renovation. The credit facilities are secured by the assets and equity of one or more SPEs. Each SPE is a consolidated subsidiary of Opendoor and a separate legal entity. Neither the assets nor credit of any such SPE are generally available to satisfy the debts and other obligations of any other Opendoor entities, except to the extent other Opendoor entities are also a party to the financing arrangements. These facilities are non-recourse to Opendoor and, with limited exceptions, non-recourse to other Opendoor subsidiaries. These SPEs are variable interest entities and Opendoor is determined to be the primary beneficiary based on its power to direct the activities that most significantly impact the economic outcomes of the entities through its role in designing the entities and managing the real estate inventory purchased and sold by the entities. The Company has potentially significant variable interest in the entities based upon the equity interest the Company holds in the VIEs. Asset-backed Senior Revolving Credit Facilities The Company classifies the senior revolving credit facilities as current liabilities on the Company’s consolidated balance sheets as amounts drawn to acquire and renovate homes are required to be repaid as the related real estate inventory is sold, which the Company expects to occur within 12 months. The following table summarizes certain details related to the Company’s credit facilities outstanding as of March 31, 2021 and December 31, 2020 (in thousands, except interest rates): March 31, 2021 Borrowing Capacity Outstanding Amount Weighted Average Interest Rate End of Revolving Period Final Maturity Date Revolving Facility 2018-2 $ 750,000 $ — — % September 23, 2022 December 23, 2022 Revolving Facility 2018-3 100,000 30,472 3.62 % June 1, 2023 June 1, 2023 Revolving Facility 2019-1 300,000 50,893 2.86 % March 4, 2022 March 4, 2022 Revolving Facility 2019-2 1,030,000 398,952 2.70 % July 8, 2021 July 7, 2022 Revolving Facility 2019-3 475,000 108,457 3.25 % August 22, 2022 August 21, 2023 Total $ 2,655,000 $ 588,774 December 31, 2020 Outstanding Amount Weighted Average Interest Rate Revolving Facility 2018-1 $ — 4.28 % Revolving Facility 2018-2 — 4.36 % Revolving Facility 2018-3 25,385 4.19 % Revolving Facility 2019-1 32,535 3.58 % Revolving Facility 2019-2 230,352 3.08 % Revolving Facility 2019-3 50,901 3.60 % Total $ 339,173 As of March 31, 2021, the Company had multiple senior revolving credit facilities with various financial institutions with a total borrowing capacity of $2,655.0 million. Undrawn borrowing capacity amounts under the senior revolving credit facilities as reflected in the table above are in some cases not fully committed and any borrowings above the fully committed amounts are subject to the applicable lender’s discretion. As of March 31, 2021, the Company had fully committed borrowing capacity with respect to the Company’s senior revolving credit facilities of $1,464.5 million. These facilities are typically structured with an initial 24 month revolving period during which time amounts can be borrowed, repaid and borrowed again. The borrowing capacity is generally available until the end of the applicable revolving period as reflected in the table above. Outstanding amounts drawn under each senior revolving credit facility are required to be repaid on the facility maturity date or earlier if accelerated due to an event of default or other mandatory repayment event. The final maturity dates and revolving period end dates reflected in the table above are inclusive of any extensions that are at the sole discretion of the Company. The Company’s senior revolving credit facilities may also have extensions subject to lender discretion that are not reflected in the table above. Borrowings accrue interest at a rate based on a LIBOR reference rate plus a margin that varies by facility. The Company may also pay fees on certain unused portions of the committed borrowing capacity, as defined in the respective credit agreements. The Company’s senior revolving credit facility arrangements typically include upfront fees that may be paid at execution of the applicable agreements or be earned at execution and payable over time. These facilities are generally fully prepayable at any time without penalty other than customary LIBOR breakage costs. These borrowings are collateralized by cash, equity in the real estate owning SPEs, and the real estate inventory funded by the relevant revolving credit facility. The lenders have legal recourse only to the real estate-owning SPE borrowers, certain SPE guarantors, and the assets securing the debt, and do not have general recourse to the Company. The senior revolving credit facilities have aggregated borrowing bases, which increase or decrease based on the cost and value of the properties financed under a given facility and the time that those properties are in the Company’s possession. When the Company resells a home, the proceeds are used to reduce the outstanding balance under the related revolving senior credit facility. The borrowing base for a given facility may be reduced as properties age beyond certain thresholds and any borrowing base deficiencies may be satisfied through contributions of additional properties or partial repayment of the facility. Asset-backed Mezzanine Term Debt Facilities The Company classifies its mezzanine term debt facilities as long-term liabilities on the Company’s consolidated balance sheets because its borrowings under these facilities are generally not required to be repaid until the applicable final maturity date. These facilities are structurally and contractually subordinated to the related senior revolving credit facilities. The following table summarizes certain details related to the Company’s mezzanine term debt facilities as of March 31, 2021 (in thousands, except interest rates): March 31, 2021 Borrowing Capacity Outstanding Amount Interest Rate End of Draw Period Final Maturity Date Term Debt Facility 2016-M1 $ 149,000 $ 40,000 10.00 % October 31, 2023 March 31, 2025 Term Debt Facility 2020-M1 300,000 100,000 10.00 % January 23, 2023 January 23, 2026 Total $ 449,000 $ 140,000 Issuance Costs (3,527) Carrying Value $ 136,473 As of March 31, 2021, the Company had $140.0 million in total principal outstanding under multiple mezzanine term debt facilities with various financial institutions. Undrawn amounts under the mezzanine term debt facilities of $309.0 million as reflected in the table above are fully committed and generally may be drawn at any time during the draw period; however, any amounts repaid reduce total borrowing capacity as repaid amounts are not available to be reborrowed. The final maturity dates as reflected in the table above are inclusive of any extensions at the sole discretion of the Company. The Company’s mezzanine term debt facilities may also have extensions subject to lender discretion that are not reflected in the table above. Borrowings under a given term debt facility accrue interest at a fixed rate. The Company’s mezzanine term debt facility arrangements may include upfront issuance costs that are capitalized as part of the facilities’ respective carrying values. These facilities are fully prepayable at any time but may be subject to certain prepayment penalties. These borrowings are collateralized by cash and equity in certain holding companies that own the Company’s real estate owning SPEs. The lenders generally have legal recourse only to the applicable borrowers of the debt and their assets securing the debt and do not have recourse to Opendoor and, with limited exceptions, do not have recourse to other Opendoor subsidiaries. The facilities have aggregated property borrowing bases, which increase or decrease based on the cost and the value of the properties financed under a given facility and time in the Company’s possession of those properties and the amount of cash collateral pledged by the relevant SPE borrower. The borrowing base for a given facility may be reduced as properties age beyond certain thresholds and any borrowing base deficiencies may be satisfied through contributions of additional properties or cash or through partial repayment of the facility. Covenants The Company’s inventory financing facilities include customary representations and warranties, covenants and events of default. Financed properties are subject to customary eligibility criteria and concentration limits. The terms of these facilities and related financing documents require Opendoor to comply with a number of customary financial and other covenants, such as maintaining certain levels of liquidity, tangible net worth or leverage (ratio of debt to equity). As of March 31, 2021, the Company was in compliance with all financial covenants and no event of default had occurred. Mortgage Financing The following tables summarize certain details related to the Company’s mortgage financing (in thousands, except interest rates): March 31, 2021 Borrowing Capacity Outstanding Amount Weighted Average Interest Rate End of Revolving Period Final Maturity Date Repo Facility 2019-R1 $ 50,000 $ 7,789 1.94 % April 29, 2021 April 29, 2021 December 31, 2020 Outstanding Amount Weighted Average Interest Rate Repo Facility 2019-R1 $ 7,149 1.94 % To provide capital for Opendoor Home Loans, we utilize a master repurchase agreement (the “Repurchase Agreement”) which is classified as a current liability on our balance sheets. In March 2019, we entered into the Repurchase Agreement with a lender to provide short-term funding for mortgage loans originated by Opendoor Home Loans. The facility provides short-term financing between the issuance of a mortgage loan and when Opendoor Home Loans sells the loan to an investor. In accordance with the Repurchase Agreement, the lender agrees to pay Opendoor Home Loans a negotiated purchase price for eligible loans and Opendoor Home Loans simultaneously agrees to repurchase such loans from the lender within a specified timeframe and at an agreed upon price that includes interest. Opendoor Labs Inc. is the guarantor with respect to the Repurchase Agreement and the obligation to repurchase loans previously transferred under the arrangement for the benefit of the lender. As of March 31, 2021, the Repurchase Agreement has a borrowing capacity of $50.0 million, of which $20.0 million is fully committed. The Repurchase Agreement includes customary representations and warranties, covenants and provisions regarding events of default. As of March 31, 2021, $8.2 million in mortgage loans were financed under the facility, and Opendoor was in compliance with all financial covenants and no event of default had occurred. On April 28, 2021, the Company amended the Repurchase Agreement to extend the final maturity date to May 28, 2021. Transactions under the Repurchase Agreement bear interest at a rate based on one-month LIBOR plus an applicable margin, as defined in the Repurchase Agreement, and are secured by residential mortgage loans available for sale. The Repurchase Agreement contains margin call provisions that provide the lender with certain rights in the event of a decline in the market value of the assets purchased under the Repurchase Agreement. The Repurchase Agreement is recourse to Opendoor Labs Inc.

FAIR VALUE DISCLOSURES

FAIR VALUE DISCLOSURES	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
FAIR VALUE DISCLOSURES	FAIR VALUE DISCLOSURES The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Following is a discussion of the fair value hierarchy and the valuation methodologies used for assets and liabilities recorded at fair value on a recurring and nonrecurring basis and for estimating fair value for financial instruments not recorded at fair value. Fair Value Hierarchy Fair value measurements of assets and liabilities are categorized based on the following hierarchy: Level 1 — Fair value determined based on quoted prices in active markets for identical assets or liabilities. Level 2 — Fair value determined using significant observable inputs, such as quoted prices for similar assets or liabilities or quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, or inputs that are derived principally from or corroborated by observable market data, by correlation or other means. Level 3 — Fair value determined using significant unobservable inputs, such as pricing models, discounted cash flows, or similar techniques. Estimation of Fair Value The following table summarizes the fair value measurement methodologies, including significant inputs and assumptions, and classification of the Company’s assets and liabilities. Asset/Liability Class Valuation Methodology, Inputs and Assumptions Classification Cash and cash equivalents Carrying value is a reasonable estimate of fair value based on short-term nature of the instruments. Estimated fair value classified as Level 1 Restricted cash Carrying value is a reasonable estimate of fair value based on short-term nature of the instruments. Estimated fair value classified as Level 1 Marketable securities Prices obtained from third-party vendors that compile prices from various sources and often apply matrix pricing for similar securities when no price is observable. Level 2 recurring fair value measurement Mortgage loans held for sale pledged under agreements to repurchase Fair value is estimated based on observable market data including quoted market prices, deal price quotes, and sale commitments. Level 2 recurring fair value measurement Other current assets Interest rate lock commitments Fair value of the underlying loan based on observable quoted market prices in the secondary market and sale commitments, with adjustments for the estimated pull-through rate. Level 2 recurring fair value measurement for fair value based on observable inputs. Level 3 recurring fair value measurement for fair value with unobservable inputs. Other assets Non-marketable equity securities Fair value is estimated using the observable transaction price. Level 2 non-recurring fair value measurement for fair value based on transaction price. Credit facilities and other secured borrowings Credit facilities Fair value is estimated using discounted cash flows based on current lending rates for similar credit facilities with similar terms and remaining time to maturity. Carried at amortized cost. Estimated fair value classified as Level 2. Loans sold under agreements to repurchase Fair value is estimated using discounted cash flows based on current lending rates for similar asset-backed financing facilities with similar terms and remaining time to maturity. Carried at amortized cost. Estimated fair value classified as Level 2. Warrant liabilities Sponsor Warrants Fair value is estimated using the price of the Public Warrants and applying an adjustment for short-term marketability restrictions. Level 2 recurring fair value measurement Assets and Liabilities Recorded at Fair Value on a Recurring Basis The following tables present the levels of the fair value hierarchy for the Company’s assets measured at fair value on a recurring basis (in thousands). March 31, 2021 Balance at Fair Value Level 1 Level 2 Level 3 Marketable securities: Commercial paper $ 23,640 $ — $ 23,640 $ — Corporate debt securities 21,186 — 21,186 — U.S. agency securities 6,999 — 6,999 — Asset-backed securities 6,794 — 6,794 — Mortgage loans held for sale pledged under agreements to repurchase 8,307 — 8,307 — Other current assets: Interest rate lock commitments 414 — 414 Total assets $ 67,340 $ — $ 66,926 $ 414 Warrant liabilities: Sponsor Warrants 62,621 — 62,621 — Total liabilities $ 62,621 $ — $ 62,621 $ — December 31, 2020 Balance at Fair Value Level 1 Level 2 Level 3 Marketable securities: Corporate debt securities $ 26,409 $ — $ 26,409 $ — Asset-backed securities 12,533 — 12,533 — U.S. agency securities 6,995 — 6,995 — U.S. Treasury securities 1,700 — 1,700 — Mortgage loans held for sale pledged under agreements to repurchase 7,529 — 7,529 — Other current assets: Interest rate lock commitments 373 373 Total assets $ 55,539 $ — $ 55,539 $ — Warrant liabilities: Sponsor Warrants 47,349 — $ 47,349 — Total liabilities $ 47,349 $ — $ 47,349 $ — Fair Value of Financial Instruments The following presents the carrying value, estimated fair value and the levels of the fair value hierarchy for the Company’s financial instruments other than assets and liabilities measured at fair value on a recurring basis (in thousands). March 31, 2021 Carrying Value Fair Value Level 1 Level 2 Assets: Cash and cash equivalents $ 2,039,876 $ 2,039,876 $ 2,039,876 $ — Restricted cash 143,311 143,311 143,311 — Other assets: Non-marketable equity securities 10,000 10,000 — 10,000 Liabilities: Credit facilities and other secured borrowings $ 733,036 $ 736,563 $ — $ 736,563 December 31, 2020 Carrying Value Fair Value Level 1 Level 2 Assets: Cash and cash equivalents $ 1,412,665 $ 1,412,665 $ 1,412,665 $ — Restricted cash 92,863 92,863 92,863 — Liabilities: Credit facilities and other secured borrowings $ 481,789 $ 486,322 $ — $ 486,322 The following table shows a reconciliation from the opening balances to the closing balances for Level 3 Fair values (in thousands): Warrants Embedded Conversion Option Interest rate lock commitments Balance as of December 31, 2019 $ 4,538 $ 41,697 $ — Net change in fair value 1,012 — — Balance as of March 31, 2020 $ 5,550 $ 41,697 $ — Balance as of December 31, 2020 $ — $ — $ — Additions — — 414 Balance as of March 31, 2021 $ — $ — $ 414

PROPERTY AND EQUIPMENT

PROPERTY AND EQUIPMENT	3 Months Ended
	Mar. 31, 2021
Property, Plant and Equipment [Abstract]
PROPERTY AND EQUIPMENT	PROPERTY AND EQUIPMENT Property and equipment as of March 31, 2021 and December 31, 2020, consisted of the following (in thousands): March 31, December 31, Internally developed software $ 52,030 $ 47,823 Computers 6,260 5,511 Furniture and fixtures 2,992 3,279 Leasehold improvements 2,178 2,456 Software implementation costs 1,789 1,680 Office equipment 1,777 2,056 Security systems 1,227 681 Total 68,253 63,486 Accumulated depreciation and amortization (37,211) (34,258) Property and equipment – net $ 31,042 $ 29,228 Depreciation and amortization expense of $5.6 million and $5.0 million was recorded for the three months ended March 31, 2021 and 2020, respectively.

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND INTANGIBLE ASSETS	GOODWILL AND INTANGIBLE ASSETS There were no additions to goodwill for the three months ended March 31, 2021 or twelve months ended December 31, 2020. No impairment of goodwill was identified for the three months ended March 31, 2021 and 2020. Intangible assets subject to amortization consisted of the follow as of March 31, 2021 and December 31, 2020, respectively (in thousands, except years): March 31, 2021 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Remaining Weighted Average Useful Life (Years) Developed technology $ 2,921 $ (2,921) $ — 0 Customer relationships 7,400 (2,947) 4,453 3.4 Trademarks 5,400 (1,907) 3,493 3.4 Non-competition agreements 100 (100) — 0 Intangible assets – net $ 15,821 $ (7,875) $ 7,946 December 31, 2020 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Remaining Weighted Average Useful Life (Years) Developed technology $ 2,921 $ (2,921) $ — 0 Customer relationships 7,400 (2,622) 4,778 3.7 Trademarks 5,400 (1,652) 3,748 3.7 Non-competition agreements 100 (100) — 0 Intangible assets – net $ 15,821 $ (7,295) $ 8,526 The Company also has domain name intangible assets, which are not subject to amortization, with a carrying amount of $0.2 million as of both March 31, 2021 and December 31, 2020, respectively. Amortization expense for intangible assets was $0.6 million and $1.1 million for the three months ended March 31, 2021 and 2020, respectively. As of March 31, 2021, expected amortization of intangible assets is as follows: Fiscal Years (In thousands) 2021 $ 1,740 2022 2,320 2023 2,320 2024 1,566 Total $ 7,946

SHAREHOLDERS_ EQUITY

SHAREHOLDERS’ EQUITY	3 Months Ended
	Mar. 31, 2021
Stockholders' Equity Note [Abstract]
SHAREHOLDERS’ EQUITY	SHAREHOLDERS’ EQUITY On February 9, 2021, the Company completed an underwritten public offering (the “February 2021 Offering”) in which the Company sold 32,817,421 shares of its common stock at a public offering price of $27.00 per share, including the exercise in full by the underwriters of their option to purchase up to 4,280,533 additional shares of common stock, which was completed on February 11, 2021. The Company received aggregate net proceeds from the February 2021 Offering of approximately $859.5 million after deducting underwriting discounts and commissions and offering expenses payable by the Company upon closing. The February 2021 Offering satisfied the liquidity event vesting condition of certain RSUs. For further information on the RSUs, see “ Note 12 — Share-Based Awards”. Public and Sponsor Warrants Prior to the Business Combination, SCH issued 6,133,333 Sponsor Warrants and 13,800,000 Public Warrants (collectively “Warrants”). Upon Closing, the Company assumed the Warrants. Each whole warrant entitles the holder to purchase one share of the Company’s common stock at a price of $11.50 per share, subject to adjustments. The Warrants are exercisable at any time commencing the later of a) 30 days after the completion of the Business Combination and b) 12 months from the date of the closing of the SCH’s initial public offering on April 30, 2020, and terminating five years after the Business Combination. Once the Public Warrants become exercisable, the Company may redeem the outstanding warrants, in whole and not in part, upon a minimum of 30 days’ prior written notice of redemption (“Redemption Period”). There are two scenarios in which the Company may redeem the Warrants. For purposes of the redemption scenarios, “Reference Value” shall mean the last reported sales price of the Company’s common stock for any twenty trading days within the thirty trading-day period ending on the third trading day prior to the date on which notice of the redemption is given. The Company may redeem the outstanding Warrants for cash at a price of $0.01 per warrant if the Reference Value equals or exceeds $18.00 per share. The warrant holders have the right to exercise their outstanding warrants prior to the scheduled redemption date during the Redemption Period at $11.50 per share. The Sponsor Warrants are exempt from redemption if the Reference Value is at or above $18.00 and the Sponsor Warrants continue to be held by the original warrant holder (“Sponsor") or a permitted transferee. The Company may redeem the outstanding Warrants at a price of $0.10 per warrant if the Reference Value equals or exceeds $10.00 per share. If the Reference Value is less than $18.00, the Sponsor Warrants must also be concurrently called for redemption with the Public Warrants. The warrant holders have the right to exercise their outstanding warrants prior to the scheduled redemption date during the Redemption Period on a cashless basis. The cashless exercise entitles the warrant holders to receive a set number of shares based on the redemption date and the redemption fair value as defined in the warrant agreement. In connection with the Business Combination, on January 12, 2021, the Company filed a Registration Statement on Form S-1. This Registration Statement relates to the issuance of an aggregate of up to 19,933,333 shares of common stock issuable upon the exercise of its publicly-traded warrants. As of March 31, 2021, there were 19,933,333 warrants outstanding and no warrants have been exercised. As of March 31, 2021, the Company had Warrant liabilities of $62.6 million related to the Sponsor Warrants and recorded a Derivative and warrant fair value adjustment of $15.3 million for the change in fair value of the Sponsor Warrants for three months ended March 31, 2021. Warrants to Purchase Series D Preferred Stock On June 12, 2018, the Company issued warrants to purchase 485,262 shares of Series D Preferred Stock at a price of $0.006 (“Penny Warrants”). On November 12, 2020, the Penny Warrants were exercised and the Company issued 485,262 shares of Series D Preferred Stock in exchange for proceeds of $3.0 thousand. As of March 31, 2021, there were no Penny Warrants outstanding. Commitment to Issue Warrants In June 2018, the Company entered into a commitment to issue warrants (“Warrant Commitment”). The Warrant Commitment obligates the Company to issue warrants on an annual basis until 2025 (“Issuance Date”). The Warrant Commitment and the Company’s obligation to issue warrants was terminated upon the consummation of the Business Combination through notice provided by the Company and acknowledged by the counterparty. On each Warrant Commitment Issuance date in June 2019 and June 2020, the Company issued warrants to purchase 121,356 shares and 242,713 shares of Series E Preferred Stock at a price of $5.92 per share (“Series E Warrants”). On November 7, 2020 the Series E Warrants were exercised and the Company issued 364,069 shares of Series E in exchange for proceeds of $2.2 million. As of March 31, 2021, there were no Series E Warrants or Warrant Commitments outstanding. The Penny Warrants, the Warrant Commitment, and the Series E Warrants have been determined to be liabilities under ASC 480 as the underlying preferred shares have certain liquidation preferences in the event of a deemed liquidation. The Company recorded no warrant fair value adjustment for the three months ended March 31, 2021 and an increase to the warrant fair value adjustments of $1.0 million for the three months ended March 31, 2020.

SHARE-BASED AWARDS

SHARE-BASED AWARDS	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
SHARE-BASED AWARDS	SHARE-BASED AWARDS Stock options and RSUs Option awards are generally granted with an exercise price equal to the fair value of the Company’s common stock at the date of grant. Options are exercisable over a maximum term of 10 years from the date of grant and generally vest over a period of four years. Incentive stock options granted to a 10% shareholder are exercisable over a maximum term of five years from the date of grant. A summary of the stock option activity for the three months ended March 31, 2021, is as follows: Number of Options (in thousands) Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Balance-December 31, 2020 24,158 $ 1.91 5.4 $ 502,767 Exercised (99) 2.65 Forfeited (92) 2.58 Expired (2) 3.02 Balance-March 31, 2021 23,965 $ 1.91 5.1 $ 461,961 Exercisable-March 31, 2021 19,766 $ 1.61 4.5 $ 387,097 There were no options granted during the three months ended March 31, 2021. RSUs typically vest upon both a service-based requirement, generally over a four year period, and a performance condition. For certain awards, the performance condition is met by the completion of a Company liquidity event, which is generally defined as a change of control event or the effective date of a registration statement of the Company filed under the Securities Act for the sale of the Company’s common stock. The February 2021 Offering met the liquidity event vesting condition and triggered the recognition of compensation expense for certain RSUs for which the time-based vesting condition had been satisfied or partially satisfied. If a participant terminates service, any portion of an RSU unit that has met the service-based requirement will remain outstanding and remain eligible to vest when the performance condition has been satisfied. The vesting requirements of the RSUs typically have a maximum term of seven years from the date of grant. A summary of the RSU activity for the three months ended March 31, 2021, is as follows: Number of RSUs (in thousands) Weighted- Average Grant-Date Fair Value Unvested and outstanding-December 31, 2020 46,525 $ 10.88 Granted 17,471 21.77 Vested (11,737) 4.95 Forfeited (153) 5.63 Unvested and outstanding-March 31, 2021 52,106 $ 15.88 Restricted Shares We have granted Restricted Shares to certain continuing employees, primarily in connection with acquisitions. The Restricted Shares vest upon satisfaction of a service condition, which generally ranges from three A summary of the Restricted Shares activity for the three months ended March 31, 2021 is as follows: Number of Restricted Shares (in thousands) Average Grant-Date Fair Value Unvested-December 31, 2020 2,148 $ 3.74 Granted — — Vested (311) 3.58 Unvested-March 31, 2021 1,837 $ 3.76 Vested and outstanding-March 31, 2021 — — Stock-based compensation expense Stock-based compensation expense is allocated based on the cost center to which the award holder belongs. The following table summarizes total stock-based compensation expense by function as presented in the statements of operations for the three months ended March 31, 2021 and 2020, as follows (in thousands): Three Months Ended March 31, 2021 2020 General and administrative $ 197,036 $ 1,554 Sales, marketing and operations 6,406 352 Technology and development 35,390 1,064 Total stock-based compensation expense $ 238,832 $ 2,970 During 2020 and during the three months ended March 31, 2021, the Company issued market condition RSUs to certain executives. The grant-date fair value for the awards is $357.4 million and $22.4 million, respectively, and will be recognized over a requisite service period ranging from 6 months to 3.5 years and 6 months to 3 years, respectively. The Company recognized $133.2 million of compensation expense during the three months ended March 31, 2021 related to all market condition awards outstanding. As of March 31, 2021, there was $651.8 million of unamortized stock-based compensation costs related to unvested RSUs, stock options, and Restricted Shares. The unamortized compensation costs are expected to be recognized over a weighted-average period of approximately 2.7 years. Valuation of options The Black-Scholes Model used to value stock options incorporates the following assumptions: Fair Value of Common Stock The fair value of the common stock underlying the stock option awards was determined by the board of directors. Given the absence of a public trading market, the board of directors considered numerous objective and subjective factors to determine the fair value of the Company’s common stock at each meeting at which awards were approved. These factors included, but were not limited to (i) contemporaneous third-party valuations of common stock; (ii) the rights, preferences and privileges of convertible preferred stock relative to common stock; (iii) the lack of marketability of common stock; (iv) stage and development of the Company’s business; (v) general economic conditions and (vi) the likelihood of achieving a liquidity event, such as an initial public offering or sale, given prevailing market conditions. Volatility The expected stock price volatilities are estimated based on the historical and implied volatilities of comparable publicly traded companies as the Company does not have sufficient history of trading its common stock. Risk-Free Interest Rate The risk-free interest rates are based on U.S. Treasury yields in effect at the grant date for notes with comparable terms as the awards. Expected Life The expected term of options granted to employees is determined using the simplified method, which allows the Company to estimate the expected life as the midpoint between the vesting period and the contractual term, as the Company's historical share option exercise experience does not provide a reasonable basis upon which to estimate the expected term. Dividend Yield The expected dividend yield assumption is based on the Company’s current expectations about its anticipated dividend policy. Valuation of RSUs and Restricted Stock Prior to the Business Combination, given the absence of a public trading market, the Company’s board of directors considered numerous objective and subjective factors to determine the fair value of common stock at each meeting at which awards were approved. These factors include, but were not limited to, contemporaneous valuations of common stock performed by an independent valuation specialist; developments in the Company’s business and stage of development; the Company’s operational and financial performance and condition; issuances of preferred stock and the rights and preferences of preferred stock relative to common stock; current condition of capital markets and the likelihood of achieving a liquidity event, such as an initial public offering or sale of the Company; and the lack of marketability of the Company’s common stock. For financial reporting purposes, the Company considers the amount of time between the valuation date and the grant date to determine

WARRANTS

WARRANTS	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
WARRANTS	SHAREHOLDERS’ EQUITY On February 9, 2021, the Company completed an underwritten public offering (the “February 2021 Offering”) in which the Company sold 32,817,421 shares of its common stock at a public offering price of $27.00 per share, including the exercise in full by the underwriters of their option to purchase up to 4,280,533 additional shares of common stock, which was completed on February 11, 2021. The Company received aggregate net proceeds from the February 2021 Offering of approximately $859.5 million after deducting underwriting discounts and commissions and offering expenses payable by the Company upon closing. The February 2021 Offering satisfied the liquidity event vesting condition of certain RSUs. For further information on the RSUs, see “ Note 12 — Share-Based Awards”. Public and Sponsor Warrants Prior to the Business Combination, SCH issued 6,133,333 Sponsor Warrants and 13,800,000 Public Warrants (collectively “Warrants”). Upon Closing, the Company assumed the Warrants. Each whole warrant entitles the holder to purchase one share of the Company’s common stock at a price of $11.50 per share, subject to adjustments. The Warrants are exercisable at any time commencing the later of a) 30 days after the completion of the Business Combination and b) 12 months from the date of the closing of the SCH’s initial public offering on April 30, 2020, and terminating five years after the Business Combination. Once the Public Warrants become exercisable, the Company may redeem the outstanding warrants, in whole and not in part, upon a minimum of 30 days’ prior written notice of redemption (“Redemption Period”). There are two scenarios in which the Company may redeem the Warrants. For purposes of the redemption scenarios, “Reference Value” shall mean the last reported sales price of the Company’s common stock for any twenty trading days within the thirty trading-day period ending on the third trading day prior to the date on which notice of the redemption is given. The Company may redeem the outstanding Warrants for cash at a price of $0.01 per warrant if the Reference Value equals or exceeds $18.00 per share. The warrant holders have the right to exercise their outstanding warrants prior to the scheduled redemption date during the Redemption Period at $11.50 per share. The Sponsor Warrants are exempt from redemption if the Reference Value is at or above $18.00 and the Sponsor Warrants continue to be held by the original warrant holder (“Sponsor") or a permitted transferee. The Company may redeem the outstanding Warrants at a price of $0.10 per warrant if the Reference Value equals or exceeds $10.00 per share. If the Reference Value is less than $18.00, the Sponsor Warrants must also be concurrently called for redemption with the Public Warrants. The warrant holders have the right to exercise their outstanding warrants prior to the scheduled redemption date during the Redemption Period on a cashless basis. The cashless exercise entitles the warrant holders to receive a set number of shares based on the redemption date and the redemption fair value as defined in the warrant agreement. In connection with the Business Combination, on January 12, 2021, the Company filed a Registration Statement on Form S-1. This Registration Statement relates to the issuance of an aggregate of up to 19,933,333 shares of common stock issuable upon the exercise of its publicly-traded warrants. As of March 31, 2021, there were 19,933,333 warrants outstanding and no warrants have been exercised. As of March 31, 2021, the Company had Warrant liabilities of $62.6 million related to the Sponsor Warrants and recorded a Derivative and warrant fair value adjustment of $15.3 million for the change in fair value of the Sponsor Warrants for three months ended March 31, 2021. Warrants to Purchase Series D Preferred Stock On June 12, 2018, the Company issued warrants to purchase 485,262 shares of Series D Preferred Stock at a price of $0.006 (“Penny Warrants”). On November 12, 2020, the Penny Warrants were exercised and the Company issued 485,262 shares of Series D Preferred Stock in exchange for proceeds of $3.0 thousand. As of March 31, 2021, there were no Penny Warrants outstanding. Commitment to Issue Warrants In June 2018, the Company entered into a commitment to issue warrants (“Warrant Commitment”). The Warrant Commitment obligates the Company to issue warrants on an annual basis until 2025 (“Issuance Date”). The Warrant Commitment and the Company’s obligation to issue warrants was terminated upon the consummation of the Business Combination through notice provided by the Company and acknowledged by the counterparty. On each Warrant Commitment Issuance date in June 2019 and June 2020, the Company issued warrants to purchase 121,356 shares and 242,713 shares of Series E Preferred Stock at a price of $5.92 per share (“Series E Warrants”). On November 7, 2020 the Series E Warrants were exercised and the Company issued 364,069 shares of Series E in exchange for proceeds of $2.2 million. As of March 31, 2021, there were no Series E Warrants or Warrant Commitments outstanding. The Penny Warrants, the Warrant Commitment, and the Series E Warrants have been determined to be liabilities under ASC 480 as the underlying preferred shares have certain liquidation preferences in the event of a deemed liquidation. The Company recorded no warrant fair value adjustment for the three months ended March 31, 2021 and an increase to the warrant fair value adjustments of $1.0 million for the three months ended March 31, 2020.

INCOME TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The Company’s provision for income taxes has not been historically significant to the business as the Company has incurred operating losses to date. Due to projected and actual losses in the current and prior years, the Company believes that based on the weight of available evidence, it is more likely than not that all of the deferred tax assets will not be realized and recorded a full valuation allowance on its net deferred tax assets as of March 31, 2021 and December 31, 2020. Therefore, only an immaterial amount of state tax expense has been recorded for the three months ended March 31, 2021. The Company’s provision for income taxes was $0.1 million for each of the three months ended March 31, 2021 and 2020, with an effective tax rate of (0.03)% and (0.19)%, respectively. The effective tax rate differs from the U.S. statutory tax rate primarily due to the recording of a full valuation allowance against the net deferred tax assets.

RELATED PARTIES

RELATED PARTIES	3 Months Ended
	Mar. 31, 2021
Related Party Transactions [Abstract]
RELATED PARTIES	RELATED PARTIES Prior to the Business Combination, one of the Preferred Stock investors held more than a 10% interest in the Company and had one seat as a member of the board of directors and another seat as an observer of the board of directors. In 2019, an executive early exercised their option to purchase 1,479,459 shares of unvested common stock at a price per share of $1.01 by issuing a promissory note to the Company for a total price of $1.5 million with an interest rate of 2.31% per annum. The promissory note was still outstanding as of March 31, 2021. The Warrant Commitment and the subsequent Series E Warrants were issued to a counterparty that has an equity interest in the Company and a seat on the Company’s board of directors. The board member has significant influence with respect to the counterparty to the Warrant Commitment. The issuance of the Warrant Commitment and Series E Warrants was in exchange for on-going advisory services that the counterparty provided to the Company. See “Note 13 — Warrants” for further information.

NET LOSS PER SHARE

NET LOSS PER SHARE	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
NET LOSS PER SHARE	NET LOSS PER SHAREThe Company uses the two-class method to calculate basic net loss per share and apply the more dilutive of the two-class method, treasury stock method or if-converted method to calculate diluted net loss per share. No dividends were declared or paid for the three months ended March 31, 2021 or 2020. Undistributed earnings for each period are allocated to participating securities, including the Preferred Stock for applicable periods, based on the contractual participation rights of the security to share in the current earnings as if all current period earnings had been distributed. As there is no contractual obligation for the Preferred Stock to share in losses, the Company’s basic net loss per share is computed by dividing the net loss attributable to common shareholders by the weighted-average shares of common stock outstanding during periods with undistributed losses. The following table sets forth the computation of the Company’s basic and diluted net loss per share attributable to common shareholders for the three months ended March 31, 2021 and 2020 (in thousands): Three Months Ended March 31, 2021 2020 Basic and diluted net loss per share: Numerator: Net loss attributable to common shareholders – basic and diluted $ (270,436) $ (62,196) Denominator: Weighted average shares outstanding – basic and diluted 565,381 84,027 Basic and diluted net loss per share $ (0.48) $ (0.74) There were no preferred dividends declared or accumulated for the period. The following securities were not included in the computation of diluted shares outstanding because the effect would be anti-dilutive, or issuance of such shares is contingent upon the satisfaction of certain conditions which were not satisfied by the end of the period (in thousands): Three Months Ended March 31, 2021 2020 Common Stock Warrants 19,933 3,370 Series D Preferred Stock Warrants — 485 Series E Preferred Stock Warrants — 121 RSUs 52,106 22,839 Options 23,965 34,680 Unvested Shares from Early Exercise 36 136 Restricted Shares 1,837 3,080 Redeemable convertible preferred stock — 314,424 Total anti-dilutive securities 97,877 379,135

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Interest Rate Lock Commitments The Company entered into interest rate lock commitments with prospective borrowers whereby the Company commits to lend a certain loan amount under specific terms and interest rate to the borrower. These commitments are treated as derivatives and are carried at fair value. See “Note 5 — Derivative Instruments” for more information. Purchase Commitments As of March 31, 2021, the Company was in contract to purchase 4,027 homes for an aggregate purchase price of $1,302.5 million. Lease Commitments During the three months ended March 31, 2021, the Company did not enter into any material new leases, lease renewals, or lease modifications. On September 25, 2020, the Company exercised an option to early terminate the San Francisco headquarters lease, effective September 30, 2021. In September 2020, the Company did not anticipate returning to the San Francisco space, so the Company accelerated amortization of the right-of-use asset and incurred and paid early termination fees. In January 2021, the Company terminated the San Francisco lease prior to the anticipated termination date of September 30, 2021, which resulted in a $5.2 million gain recognized in the consolidated statements of operations for the three months ended March 31, 2021. Legal Matters From time to time, the Company may be subject to potential liability relating to the ownership and operations of the Company’s properties. Accruals are recorded when the outcome is probable and can be reasonably estimated. There are various claims and lawsuits arising in the normal course of business pending against the Company, some of which seek damages and other relief which, if granted, may require future cash expenditures. In addition, from time to time the Company receives inquiries and audit requests from various government agencies and fully cooperates with these requests. The Company does not believe that it is reasonably possible that the resolution of these matters would result in any liability that would materially affect the Company’s consolidated results of operations or financial condition except as noted below. On December 23, 2020, the Federal Trade Commission (“FTC”) notified the Company that they intend to recommend that the agency pursue an enforcement action against the Company and certain of its officers, if the Company is unable to reach a negotiated settlement acceptable to all parties. This notice is related to an initial FTC civil investigative demand sent to the Company in August 2019 seeking documents and information relating primarily to statements in Opendoor’s advertising and website comparing selling homes to Opendoor with selling homes in a traditional manner using an agent and relating to statements that Opendoor’s offers reflect or are based on market prices. The Company is engaged in settlement negotiations with the FTC and has accrued an immaterial amount for this matter. Any settlement could result in material monetary remedies and/or compliance requirements that could have a materially adverse impact on its financial results. The Company cannot make an estimate of the possible loss or range of loss incremental to the amount accrued, if any, resulting from negotiations with the FTC at this time.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTSOn April 1, 2021, the Company entered into a new senior term debt facility with $400.0 million in borrowing capacity, a 3.48% interest rate and a final maturity date of April 1, 2025.

DESCRIPTION OF BUSINESS AND A_2

DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Description of Business	Description of Business Opendoor Technologies Inc. (the “Company” and “Opendoor”) including its consolidated subsidiaries and certain variable interest entities (“VIEs”), is a leading digital platform for buying and selling homes. Opendoor streamlines the home selling and buying transaction and creates an end-to-end experience online. Since its inception through March 31, 2021, the Company had completed approximately 90,000 home transactions. As of March 31, 2021, the Company operated in 27 markets across the United States. The Company was incorporated in Delaware on December 30, 2013.
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared pursuant to generally accepted accounting principles in the United States of America (“GAAP”). The condensed consolidated financial statements as of March 31, 2021 and December 31, 2020 and for the three month periods ended March 31, 2021 and 2020 include the accounts of Opendoor, its wholly owned subsidiaries and VIEs where the Company is the primary beneficiary. The accompanying unaudited consolidated financial statements reflect all adjustments which are, in the opinion of management, necessary to a fair statement of the results for the interim periods presented. All significant intercompany accounts and transactions have been eliminated in the consolidated financial statements herein. As a result of the Business Combination completed on December 18, 2020, prior period share and per share amounts presented in the accompanying consolidated financial statements and these related notes have been retroactively converted. See “ Note 2— Business Combination” for additional information. The accompanying interim condensed consolidated financial statements and these related notes should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (“Annual Report”) filed on March 4, 2021.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results may differ materially from such estimates. Significant estimates, assumptions and judgments made by management include, among others, the determination of the fair value of common stock, share-based awards, warrants, derivatives, convertible notes, and inventory impairment (“real estate inventory valuation adjustment”). Management believes that the estimates and judgments upon which they rely are reasonable based upon information available to them at the time that these estimates and judgments are made. To the extent that there are material differences between these estimates and actual results, the Company’s financial statements will be affected. The COVID-19 pandemic introduced significant additional uncertainties with respect to estimates, judgments and assumptions, which may materially impact these estimates.
Significant Risks and Uncertainties	Significant Risks and Uncertainties The Company operates in a dynamic industry and, accordingly, can be affected by a variety of factors. For example, the Company believes that changes in any of the following areas could have a significant negative effect on the Company in terms of its future financial position, results of operations or cash flows: public health crises, like the COVID-19 pandemic; its rates of revenue growth; its ability to manage advertising inventory or pricing; engagement and usage of its products; the effectiveness of its investment of resources to pursue strategies; competition in its market; the stability of the residential real estate market; the impact of interest rate changes on demand and its costs; changes in technology, products, markets or services by the Company or its competitors; the addition or loss of significant customers; its ability to maintain or establish relationships with listings and data providers; its ability to obtain or maintain licenses and permits to support its current and future businesses; actual or anticipated changes to its products and services; changes in government regulation affecting its business; the outcomes of legal proceedings; natural disasters and catastrophic events; scaling and adaptation of existing technology and network infrastructure; its management of its growth; its ability to attract and retain qualified employees and key personnel; its ability to successfully integrate and realize the benefits of its past or future strategic acquisitions or investments; the protection of customers’ information and other privacy concerns; the protection of its brand and intellectual property; and intellectual property infringement and other claims, among other things.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments, which potentially subject the Company to concentrations of credit risk, consist primarily of cash and cash equivalents, investments in marketable securities, and mortgage loans held for sale pledged under agreements to repurchase (“MLHFS”). The Company places cash and cash equivalents and investments with major financial institutions, which management assesses to be of high credit quality, in order to limit exposure of the Company’s investments.
Derivative Instruments	Derivative InstrumentsThe Company’s derivative instruments are comprised of interest rate caps, interest rate lock commitments (“IRLCs”), and embedded conversion options related to the convertible notes. The Company’s derivative instruments are freestanding in nature and some are utilized as economic hedges. These derivative instruments are recorded at fair value with changes recognized as a gain or loss to operations. Beginning in 2021, the Company changed the fair value classification of IRLCs from Level 2 to Level 3 as the Company began to adjust observable input data for the estimated pull-through rate, a Company specific input that is unobservable to market participants.
Non-marketable equity securities	Non-marketable equity securities Our non-marketable equity securities are strategic investments in a privately held company. Non-marketable equity securities are investments that do not have a readily determinable fair value, which are measured at cost minus impairment, if any, adjusted for changes resulting from observable price changes in orderly transactions for an identical or similar investment in the same issuer (the “Measurement Alternative”). All gains and losses on these investments, realized and unrealized, are recorded in Other income-net on our consolidated statements of operations. We assess whether an impairment loss on our non-marketable equity securities has occurred due to declines in fair value or other market conditions. If any impairment is identified for non-marketable equity securities, we write down the investment to its fair value.
Impairment of Long-Lived Assets	Impairment of Long-Lived AssetsLong-lived assets, such as property and equipment and definite-lived intangible assets, among other long-term assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If circumstances require a long-lived asset or asset group be tested for possible impairment, the Company first compares undiscounted cash flows expected to be generated by that asset or asset group to its carrying amount. If the carrying amount of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment loss is recognized to the extent the carrying amount of the underlying asset exceeds its fair value.
Recently Issued Accounting Standards	Recently Issued Accounting Standards Recently Adopted Accounting Standards In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes (Topic 740). ASU 2019-12 eliminates certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. It also clarifies and simplifies other aspects of the accounting for income taxes. This guidance is effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. The Company adopted this ASU as of January 1, 2021 and the adoption of this ASU did not have a material impact to the Company’s consolidated financial statements given that the Company has a full valuation allowance and the scenarios for which the guidance offer simplification are not significant for the Company. Recently Issued Accounting Standards Not Yet Adopted In March 2020, the FASB issued ASU 2020-04 which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions that reference the London Inter- Bank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued because of reference rate reform. This guidance is optional for a limited period of time to ease the potential burden in accounting for, or recognizing the effects of, reference rate reform on financial reporting. This guidance is effective from March 12, 2020 through December 31, 2022. Entities may elect to adopt the amendments for contract modifications as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020, or prospectively from a date within an interim period that includes or is subsequent to March 12, 2020, up to the date that the financial statements are available to be issued. The Company may elect to take advantage of this optional guidance in its transition away from LIBOR within certain debt contracts. While the goal of the reference rate reform transition is for it to be economically neutral to entities, the Company has not yet adopted this standard nor has the Company determined the impact the adoption of this guidance will have on the Company’s financial position, results of operations or cash flows.

DESCRIPTION OF BUSINESS AND A_3

DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES (Tables)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Schedule of Error Corrections and Prior Period Adjustments	The following table provides the impact of the correction on the Company's Condensed Consolidated Balance Sheet as of December 31, 2020, as presented herein (in thousands): Previously Stated Adjustments As Corrected Warrant liabilities $ — 47,349 $ 47,349 Total liabilities $ 575,575 47,349 $ 622,924 Additional paid-in capital $ 2,677,155 (81,143) $ 2,596,012 Accumulated deficit (1,077,243) 33,794 (1,043,449) Total shareholders' equity $ 1,600,007 (47,349) $ 1,552,658

REAL ESTATE INVENTORY (Tables)

REAL ESTATE INVENTORY (Tables)	3 Months Ended
	Mar. 31, 2021
Inventory Disclosure [Abstract]
Real Estate Inventory	The following table presents the components of inventory, net of applicable real estate inventory valuation adjustments, as of the dates presented (in thousands): March 31, December 31, Work-in-process $ 206,943 $ 183,004 Finished goods 633,689 282,932 Total real estate inventory $ 840,632 $ 465,936

CASH, CASH EQUIVALENTS, AND I_2

CASH, CASH EQUIVALENTS, AND INVESTMENTS (Tables)	3 Months Ended
	Mar. 31, 2021
Cash and Cash Equivalents [Abstract]
Schedule of Available-for-sale Securities Reconciliation	The amortized cost, gross unrealized gains and losses, and fair value of cash, cash equivalents, and marketable securities as of March 31, 2021 and December 31, 2020, are as follows (in thousands): March 31, 2021 Cost Basis Unrealized Gains Unrealized Losses Fair Value Cash and Cash Equivalents Marketable Securities Cash $ 718,476 $ — $ — $ 718,476 $ 718,476 $ — Money market funds 1,252,134 — — 1,252,134 1,252,134 — Commercial paper 83,881 3 — 83,884 60,244 23,640 Corporate debt securities 30,209 8 (9) 30,208 9,022 21,186 U.S. agency securities 6,996 3 — 6,999 — 6,999 Asset-backed securities 6,792 6 (4) 6,794 — 6,794 Total $ 2,098,488 $ 20 $ (13) $ 2,098,495 $ 2,039,876 $ 58,619 December 31, 2020 Cost Basis Unrealized Gains Unrealized Losses Fair Value Cash and Cash Equivalents Marketable Securities Cash $ 709,924 $ — $ — $ 709,924 $ 709,924 $ — Money market funds 618,197 — — 618,197 618,197 — Commercial paper 81,037 1 — 81,038 81,038 — Corporate debt securities 29,891 26 (2) 29,915 3,506 26,409 Asset-backed securities 12,518 19 (4) 12,533 — 12,533 U.S. agency securities 6,993 2 — 6,995 — 6,995 U.S. Treasury securities 1,700 — — 1,700 — 1,700 Total $ 1,460,260 $ 48 $ (6) $ 1,460,302 $ 1,412,665 $ 47,637
Schedule of Unrealized Loss on Investments	A summary of debt securities with unrealized losses aggregated by period of continuous unrealized loss is as follows (in thousands): Less than 12 Months 12 Months or Greater Total March 31, 2021 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Commercial paper $ 26,595 $ — $ — $ — $ 26,595 $ — Corporate debt securities 22,450 (9) $ — $ — 22,450 (9) Asset-backed securities 3,277 (4) $ — $ — 3,277 (4) Total $ 52,322 $ (13) $ — $ — $ 52,322 $ (13) Less than 12 Months 12 Months or Greater Total December 31, 2020 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Commercial paper $ 19,296 $ — $ — $ — $ 19,296 $ — Corporate debt securities 7,538 (2) $ — $ — 7,538 (2) Asset-backed securities 4,611 (4) $ — $ — 4,611 (4) Total $ 31,445 $ (6) $ — $ — $ 31,445 $ (6)
Investments Classified by Contractual Maturity Date	The scheduled contractual maturities of debt securities as of March 31, 2021 are as follows (in thousands): March 31, 2021 Fair Value Within 1 Year After 1 Year through 5 Years Commercial paper $ 83,884 $ 83,884 $ — Corporate-debt securities 30,208 30,208 — U.S. agency securities 6,999 6,999 — Asset-backed securities 6,794 6,794 — Total $ 127,885 $ 127,885 $ —

DERIVATIVE INSTRUMENTS (Tables)

DERIVATIVE INSTRUMENTS (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Positions	The following table presents the total notional amounts and fair values for the Company’s derivatives (in thousands): Notional Amount Fair Value Derivatives March 31, 2021 Asset Liability Interest rate lock commitments $ 17,958 $ 414 $ — Notional Amount Fair Value Derivatives December 31, 2020 Asset Liability Interest rate lock commitments $ 15,130 $ 373 $ —
Schedule of Net Gains and Losses	The following table presents the net gains and losses recognized on derivatives within the respective line items in the statement of operations for the periods indicated (in thousands): Three Months Ended March 31, 2021 2020 Revenue $ 41 $ 48 Other income, net $ — $ (4)

VARIABLE INTEREST ENTITIES (Tab

VARIABLE INTEREST ENTITIES (Tables)	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Variable Interest Entities	The following table summarizes the assets and liabilities related to the VIEs consolidated by the Company as of March 31, 2021 and December 31, 2020 (in thousands): March 31, December 31, Assets Cash and cash equivalents $ 9,108 $ 15,849 Restricted cash 133,887 81,408 Real estate inventory 820,961 460,680 Other (1) 29,059 6,729 Total assets $ 993,015 $ 564,666 Liabilities Credit facilities $ 725,247 $ 474,640 Other (2) 5,310 3,394 Total liabilities $ 730,557 $ 478,034 ________________ (1) Includes escrow receivable and other current assets. (2) Includes accounts payable and other accrued liabilities and interest payable.

CREDIT FACILITIES AND LONG-TE_2

CREDIT FACILITIES AND LONG-TERM DEBT (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The following table summarizes certain details related to the Company’s credit facilities outstanding as of March 31, 2021 and December 31, 2020 (in thousands, except interest rates): March 31, 2021 Borrowing Capacity Outstanding Amount Weighted Average Interest Rate End of Revolving Period Final Maturity Date Revolving Facility 2018-2 $ 750,000 $ — — % September 23, 2022 December 23, 2022 Revolving Facility 2018-3 100,000 30,472 3.62 % June 1, 2023 June 1, 2023 Revolving Facility 2019-1 300,000 50,893 2.86 % March 4, 2022 March 4, 2022 Revolving Facility 2019-2 1,030,000 398,952 2.70 % July 8, 2021 July 7, 2022 Revolving Facility 2019-3 475,000 108,457 3.25 % August 22, 2022 August 21, 2023 Total $ 2,655,000 $ 588,774 December 31, 2020 Outstanding Amount Weighted Average Interest Rate Revolving Facility 2018-1 $ — 4.28 % Revolving Facility 2018-2 — 4.36 % Revolving Facility 2018-3 25,385 4.19 % Revolving Facility 2019-1 32,535 3.58 % Revolving Facility 2019-2 230,352 3.08 % Revolving Facility 2019-3 50,901 3.60 % Total $ 339,173 March 31, 2021 Borrowing Capacity Outstanding Amount Interest Rate End of Draw Period Final Maturity Date Term Debt Facility 2016-M1 $ 149,000 $ 40,000 10.00 % October 31, 2023 March 31, 2025 Term Debt Facility 2020-M1 300,000 100,000 10.00 % January 23, 2023 January 23, 2026 Total $ 449,000 $ 140,000 Issuance Costs (3,527) Carrying Value $ 136,473 The following tables summarize certain details related to the Company’s mortgage financing (in thousands, except interest rates): March 31, 2021 Borrowing Capacity Outstanding Amount Weighted Average Interest Rate End of Revolving Period Final Maturity Date Repo Facility 2019-R1 $ 50,000 $ 7,789 1.94 % April 29, 2021 April 29, 2021 December 31, 2020 Outstanding Amount Weighted Average Interest Rate Repo Facility 2019-R1 $ 7,149 1.94 %

FAIR VALUE DISCLOSURES (Tables)

FAIR VALUE DISCLOSURES (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Disclosures	The following table summarizes the fair value measurement methodologies, including significant inputs and assumptions, and classification of the Company’s assets and liabilities. Asset/Liability Class Valuation Methodology, Inputs and Assumptions Classification Cash and cash equivalents Carrying value is a reasonable estimate of fair value based on short-term nature of the instruments. Estimated fair value classified as Level 1 Restricted cash Carrying value is a reasonable estimate of fair value based on short-term nature of the instruments. Estimated fair value classified as Level 1 Marketable securities Prices obtained from third-party vendors that compile prices from various sources and often apply matrix pricing for similar securities when no price is observable. Level 2 recurring fair value measurement Mortgage loans held for sale pledged under agreements to repurchase Fair value is estimated based on observable market data including quoted market prices, deal price quotes, and sale commitments. Level 2 recurring fair value measurement Other current assets Interest rate lock commitments Fair value of the underlying loan based on observable quoted market prices in the secondary market and sale commitments, with adjustments for the estimated pull-through rate. Level 2 recurring fair value measurement for fair value based on observable inputs. Level 3 recurring fair value measurement for fair value with unobservable inputs. Other assets Non-marketable equity securities Fair value is estimated using the observable transaction price. Level 2 non-recurring fair value measurement for fair value based on transaction price. Credit facilities and other secured borrowings Credit facilities Fair value is estimated using discounted cash flows based on current lending rates for similar credit facilities with similar terms and remaining time to maturity. Carried at amortized cost. Estimated fair value classified as Level 2. Loans sold under agreements to repurchase Fair value is estimated using discounted cash flows based on current lending rates for similar asset-backed financing facilities with similar terms and remaining time to maturity. Carried at amortized cost. Estimated fair value classified as Level 2. Warrant liabilities Sponsor Warrants Fair value is estimated using the price of the Public Warrants and applying an adjustment for short-term marketability restrictions. Level 2 recurring fair value measurement
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables present the levels of the fair value hierarchy for the Company’s assets measured at fair value on a recurring basis (in thousands). March 31, 2021 Balance at Fair Value Level 1 Level 2 Level 3 Marketable securities: Commercial paper $ 23,640 $ — $ 23,640 $ — Corporate debt securities 21,186 — 21,186 — U.S. agency securities 6,999 — 6,999 — Asset-backed securities 6,794 — 6,794 — Mortgage loans held for sale pledged under agreements to repurchase 8,307 — 8,307 — Other current assets: Interest rate lock commitments 414 — 414 Total assets $ 67,340 $ — $ 66,926 $ 414 Warrant liabilities: Sponsor Warrants 62,621 — 62,621 — Total liabilities $ 62,621 $ — $ 62,621 $ — December 31, 2020 Balance at Fair Value Level 1 Level 2 Level 3 Marketable securities: Corporate debt securities $ 26,409 $ — $ 26,409 $ — Asset-backed securities 12,533 — 12,533 — U.S. agency securities 6,995 — 6,995 — U.S. Treasury securities 1,700 — 1,700 — Mortgage loans held for sale pledged under agreements to repurchase 7,529 — 7,529 — Other current assets: Interest rate lock commitments 373 373 Total assets $ 55,539 $ — $ 55,539 $ — Warrant liabilities: Sponsor Warrants 47,349 — $ 47,349 — Total liabilities $ 47,349 $ — $ 47,349 $ —
Fair Value Disclosure of Asset and Liability Not Measured at Fair Value	The following presents the carrying value, estimated fair value and the levels of the fair value hierarchy for the Company’s financial instruments other than assets and liabilities measured at fair value on a recurring basis (in thousands). March 31, 2021 Carrying Value Fair Value Level 1 Level 2 Assets: Cash and cash equivalents $ 2,039,876 $ 2,039,876 $ 2,039,876 $ — Restricted cash 143,311 143,311 143,311 — Other assets: Non-marketable equity securities 10,000 10,000 — 10,000 Liabilities: Credit facilities and other secured borrowings $ 733,036 $ 736,563 $ — $ 736,563 December 31, 2020 Carrying Value Fair Value Level 1 Level 2 Assets: Cash and cash equivalents $ 1,412,665 $ 1,412,665 $ 1,412,665 $ — Restricted cash 92,863 92,863 92,863 — Liabilities: Credit facilities and other secured borrowings $ 481,789 $ 486,322 $ — $ 486,322
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	The following table shows a reconciliation from the opening balances to the closing balances for Level 3 Fair values (in thousands): Warrants Embedded Conversion Option Interest rate lock commitments Balance as of December 31, 2019 $ 4,538 $ 41,697 $ — Net change in fair value 1,012 — — Balance as of March 31, 2020 $ 5,550 $ 41,697 $ — Balance as of December 31, 2020 $ — $ — $ — Additions — — 414 Balance as of March 31, 2021 $ — $ — $ 414

PROPERTY AND EQUIPMENT (Tables)

PROPERTY AND EQUIPMENT (Tables)	3 Months Ended
	Mar. 31, 2021
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	Property and equipment as of March 31, 2021 and December 31, 2020, consisted of the following (in thousands): March 31, December 31, Internally developed software $ 52,030 $ 47,823 Computers 6,260 5,511 Furniture and fixtures 2,992 3,279 Leasehold improvements 2,178 2,456 Software implementation costs 1,789 1,680 Office equipment 1,777 2,056 Security systems 1,227 681 Total 68,253 63,486 Accumulated depreciation and amortization (37,211) (34,258) Property and equipment – net $ 31,042 $ 29,228

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS (Tables)	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	Intangible assets subject to amortization consisted of the follow as of March 31, 2021 and December 31, 2020, respectively (in thousands, except years): March 31, 2021 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Remaining Weighted Average Useful Life (Years) Developed technology $ 2,921 $ (2,921) $ — 0 Customer relationships 7,400 (2,947) 4,453 3.4 Trademarks 5,400 (1,907) 3,493 3.4 Non-competition agreements 100 (100) — 0 Intangible assets – net $ 15,821 $ (7,875) $ 7,946 December 31, 2020 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Remaining Weighted Average Useful Life (Years) Developed technology $ 2,921 $ (2,921) $ — 0 Customer relationships 7,400 (2,622) 4,778 3.7 Trademarks 5,400 (1,652) 3,748 3.7 Non-competition agreements 100 (100) — 0 Intangible assets – net $ 15,821 $ (7,295) $ 8,526
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	As of March 31, 2021, expected amortization of intangible assets is as follows: Fiscal Years (In thousands) 2021 $ 1,740 2022 2,320 2023 2,320 2024 1,566 Total $ 7,946

SHARE-BASED AWARDS (Tables)

SHARE-BASED AWARDS (Tables)	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Summary of the Stock Option Activity	A summary of the stock option activity for the three months ended March 31, 2021, is as follows: Number of Options (in thousands) Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Balance-December 31, 2020 24,158 $ 1.91 5.4 $ 502,767 Exercised (99) 2.65 Forfeited (92) 2.58 Expired (2) 3.02 Balance-March 31, 2021 23,965 $ 1.91 5.1 $ 461,961 Exercisable-March 31, 2021 19,766 $ 1.61 4.5 $ 387,097
Summary of the RSU Activity	A summary of the RSU activity for the three months ended March 31, 2021, is as follows: Number of RSUs (in thousands) Weighted- Average Grant-Date Fair Value Unvested and outstanding-December 31, 2020 46,525 $ 10.88 Granted 17,471 21.77 Vested (11,737) 4.95 Forfeited (153) 5.63 Unvested and outstanding-March 31, 2021 52,106 $ 15.88
Summary of the Restricted Shares Activity	A summary of the Restricted Shares activity for the three months ended March 31, 2021 is as follows: Number of Restricted Shares (in thousands) Average Grant-Date Fair Value Unvested-December 31, 2020 2,148 $ 3.74 Granted — — Vested (311) 3.58 Unvested-March 31, 2021 1,837 $ 3.76 Vested and outstanding-March 31, 2021 — —
Summary of Stock-Based Compensation Expense in the Statements of Operations	Stock-based compensation expense is allocated based on the cost center to which the award holder belongs. The following table summarizes total stock-based compensation expense by function as presented in the statements of operations for the three months ended March 31, 2021 and 2020, as follows (in thousands): Three Months Ended March 31, 2021 2020 General and administrative $ 197,036 $ 1,554 Sales, marketing and operations 6,406 352 Technology and development 35,390 1,064 Total stock-based compensation expense $ 238,832 $ 2,970

NET LOSS PER SHARE (Tables)

NET LOSS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of the Company’s basic and diluted net loss per share attributable to common shareholders for the three months ended March 31, 2021 and 2020 (in thousands): Three Months Ended March 31, 2021 2020 Basic and diluted net loss per share: Numerator: Net loss attributable to common shareholders – basic and diluted $ (270,436) $ (62,196) Denominator: Weighted average shares outstanding – basic and diluted 565,381 84,027 Basic and diluted net loss per share $ (0.48) $ (0.74)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following securities were not included in the computation of diluted shares outstanding because the effect would be anti-dilutive, or issuance of such shares is contingent upon the satisfaction of certain conditions which were not satisfied by the end of the period (in thousands): Three Months Ended March 31, 2021 2020 Common Stock Warrants 19,933 3,370 Series D Preferred Stock Warrants — 485 Series E Preferred Stock Warrants — 121 RSUs 52,106 22,839 Options 23,965 34,680 Unvested Shares from Early Exercise 36 136 Restricted Shares 1,837 3,080 Redeemable convertible preferred stock — 314,424 Total anti-dilutive securities 97,877 379,135

DESCRIPTION OF BUSINESS AND A_4

DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES - Description of Business (Details) home in Thousands	3 Months Ended
	Mar. 31, 2021homemarket
Accounting Policies [Abstract]
Number of home transactions completed | home	90
Number of currently operated markets | market	27

DESCRIPTION OF BUSINESS AND A_5

DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES - Correction of Prior Period Amounts (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 18, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Warrants outstanding	$ 47,349	$ 62,621
Derivative and warrant fair value adjustment		(15,272)	$ (1,012)
Accumulated deficit	(1,043,449)	(1,313,885)
Additional paid-in capital	(2,596,012)	(3,697,382)
Revision of Prior Period, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Warrants outstanding	47,349
Accumulated deficit	33,794
Additional paid-in capital	81,143
Sponsor Warrants
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Warrants outstanding	47,300	$ 62,600		$ 81,100
Derivative and warrant fair value adjustment	33,800
Private Warrants | Revision of Prior Period, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Warrants outstanding	$ 47,300

DESCRIPTION OF BUSINESS AND A_6

DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES - Impact of the Correction on the Company's Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
WARRANT LIABILITIES		$ 62,621	$ 47,349
Total liabilities	[1]	888,151	622,924
Additional paid-in capital		3,697,382	2,596,012
Accumulated deficit		(1,313,885)	(1,043,449)
Shareholders' deficit,		$ 2,383,561	1,552,658	$ (792,166)	$ (733,103)
Previously Stated
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
WARRANT LIABILITIES			0
Total liabilities			575,575
Additional paid-in capital			2,677,155
Accumulated deficit			(1,077,243)
Shareholders' deficit,			1,600,007
Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
WARRANT LIABILITIES			47,349
Total liabilities			47,349
Additional paid-in capital			(81,143)
Accumulated deficit			33,794
Shareholders' deficit,			$ (47,349)
[1]	The Company’s consolidated liabilities at March 31, 2021 and December 31, 2020 include the following liabilities for which the VIE creditors do not have recourse to Opendoor: Accounts payable and other accrued liabilities, $4,090 and $2,335; Interest payable, $1,220 and $1,059; Current portion of credit facilities and other secured borrowings, $588,774 and $339,173; Credit facilities, net of current portion, $136,473 and $135,467; and Total liabilities, $730,557 and $478,034, respectively.

DESCRIPTION OF BUSINESS AND A_7

DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES - Impairment of Long-Lived Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Impairment of long-lived assets held-for-use	$ 2.6	$ 0
Technology and development
Finite-Lived Intangible Assets [Line Items]
Impairment of long-lived assets held-for-use	1.9
General and administrative
Finite-Lived Intangible Assets [Line Items]
Impairment of long-lived assets held-for-use	$ 0.7

DESCRIPTION OF BUSINESS AND A_8

DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES - Public and Sponsor Warrants (Details) - $ / shares	Mar. 31, 2021	Dec. 31, 2020	Apr. 30, 2020
Class of Warrant or Right [Line Items]
Exercise price of warrants (in dollars per share)	$ 11.50
Warrants to purchase shares (in shares)	19,933,333	19,933,333
Warrants to purchase share of Class A common stock			1
Reference value (in dollars per share)	$ 18
Warrants to purchase shares (in shares)	19,933,333
Social Capital Hedosophia Holdings Corp II - IPO
Class of Warrant or Right [Line Items]
Number of units issued (in shares)			41,400,000
Common stock price per share (in usd per share)			$ 10
Public Warrants
Class of Warrant or Right [Line Items]
Exercise price of warrants (in dollars per share)			$ 11.50
Warrants to purchase shares (in shares)			13,800,000
Warrants to purchase share of Class A common stock			1
Sponsor Warrants
Class of Warrant or Right [Line Items]
Exercise price of warrants (in dollars per share)			$ 11.50
Warrants to purchase shares (in shares)			6,133,333
Price per warrant (in usd per share)			$ 1.50
Warrants to purchase share of Class A common stock			1
Reference value (in dollars per share)	$ 18
Minimum | Public Warrants
Class of Warrant or Right [Line Items]
Reference value (in dollars per share)	10
Maximum | Public Warrants
Class of Warrant or Right [Line Items]
Reference value (in dollars per share)	$ 18

BUSINESS COMBINATION (Details)

BUSINESS COMBINATION (Details) $ / shares in Units, $ in Thousands	Dec. 18, 2020USD ($)$ / sharesshares	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)
Business Combination [Line Items]
Equity issuance costs		$ 28,848	$ 0
Transaction with Social Capital Hedosophia Holdings Corp. II I Common Stock
Business Combination [Line Items]
Consideration received due to reverse recapitalization	$ 376,600
PIPE shares issued by Social Capital Hedosophia Holdings Corp. II | shares	60,005,000
Common stock price per PIPE Shares (in usd per share) | $ / shares	$ 10
Total PIPE shares investment	$ 600,100
Exchange ratio upon Business Combination with Social Capital Hedosophia Holdings Corp. II	1.618
Opendoor Technologies Inc. Common Stock | Common Stock Warrants
Business Combination [Line Items]
Equity issuance costs	$ 43,600

REAL ESTATE INVENTORY (Details)

REAL ESTATE INVENTORY (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Work-in-process	$ 206,943	$ 183,004
Finished goods	633,689	282,932
Total real estate inventory	$ 840,632	$ 465,936

CASH, CASH EQUIVALENTS, AND I_3

CASH, CASH EQUIVALENTS, AND INVESTMENTS - Amortized Cost (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 2,039,876	$ 1,412,665	$ 409,257
Total cost basis	2,098,488	1,460,260
Unrealized Gains	20	48
Unrealized Losses	(13)	(6)
Fair Value	127,885
Total fair value	2,098,495	1,460,302
Cash and Cash Equivalents	2,039,876	1,412,665
Marketable Securities	58,619	47,637
Commercial paper
Cash and Cash Equivalents [Line Items]
Cost Basis	83,881	81,037
Unrealized Gains	3	1
Unrealized Losses	0	0
Fair Value	83,884	81,038
Cash and Cash Equivalents	60,244	81,038
Marketable Securities	23,640
Corporate debt securities
Cash and Cash Equivalents [Line Items]
Cost Basis	30,209	29,891
Unrealized Gains	8	26
Unrealized Losses	(9)	(2)
Fair Value	30,208	29,915
Cash and Cash Equivalents	9,022	3,506
Marketable Securities	21,186	26,409
Asset-backed securities
Cash and Cash Equivalents [Line Items]
Cost Basis	6,792	12,518
Unrealized Gains	6	19
Unrealized Losses	(4)	(4)
Fair Value	6,794	12,533
Cash and Cash Equivalents	0	0
Marketable Securities	6,794	12,533
U.S. agency securities
Cash and Cash Equivalents [Line Items]
Cost Basis	6,996	6,993
Unrealized Gains	3	2
Unrealized Losses	0	0
Fair Value	6,999	6,995
Cash and Cash Equivalents	0	0
Marketable Securities	6,999	6,995
U.S. Treasury securities
Cash and Cash Equivalents [Line Items]
Cost Basis		1,700
Unrealized Gains		0
Unrealized Losses		0
Fair Value		1,700
Cash and Cash Equivalents		0
Marketable Securities		1,700
Cash
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	718,476	709,924
Money market funds
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 1,252,134	$ 618,197

CASH, CASH EQUIVALENTS, AND I_4

CASH, CASH EQUIVALENTS, AND INVESTMENTS - Summary of Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Fair Value, Less than 12 Months	$ 52,322	$ 31,445
Unrealized Losses, Less than 12 Months	(13)	(6)
Fair Value, 12 Months or Greater	0	0
Unrealized Losses 12 Months or Greater	0	0
Fair Value, Total	52,322	31,445
Unrealized Losses, Total	(13)	(6)
Commercial paper
Cash and Cash Equivalents [Line Items]
Fair Value, Less than 12 Months	26,595	19,296
Unrealized Losses, Less than 12 Months	0	0
Fair Value, 12 Months or Greater	0	0
Unrealized Losses 12 Months or Greater	0	0
Fair Value, Total	26,595	19,296
Unrealized Losses, Total	0	0
Corporate debt securities
Cash and Cash Equivalents [Line Items]
Fair Value, Less than 12 Months	22,450	7,538
Unrealized Losses, Less than 12 Months	(9)	(2)
Fair Value, 12 Months or Greater	0	0
Unrealized Losses 12 Months or Greater	0	0
Fair Value, Total	22,450	7,538
Unrealized Losses, Total	(9)	(2)
Asset-backed securities
Cash and Cash Equivalents [Line Items]
Fair Value, Less than 12 Months	3,277	4,611
Unrealized Losses, Less than 12 Months	(4)	(4)
Fair Value, 12 Months or Greater	0	0
Unrealized Losses 12 Months or Greater	0	0
Fair Value, Total	3,277	4,611
Unrealized Losses, Total	$ (4)	$ (4)

CASH, CASH EQUIVALENTS, AND I_5

CASH, CASH EQUIVALENTS, AND INVESTMENTS - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Fair Value	$ 127,885
Within 1 Year	127,885
After 1 Year through 5 Years	0
Commercial paper
Cash and Cash Equivalents [Line Items]
Fair Value	83,884	$ 81,038
Within 1 Year	83,884
After 1 Year through 5 Years	0
Corporate debt securities
Cash and Cash Equivalents [Line Items]
Fair Value	30,208	29,915
Within 1 Year	30,208
After 1 Year through 5 Years	0
Asset-backed securities
Cash and Cash Equivalents [Line Items]
Fair Value	6,794	12,533
Within 1 Year	6,794
After 1 Year through 5 Years	0
U.S. agency securities
Cash and Cash Equivalents [Line Items]
Fair Value	6,999	$ 6,995
Within 1 Year	6,999
After 1 Year through 5 Years	$ 0

CASH, CASH EQUIVALENTS, AND I_6

CASH, CASH EQUIVALENTS, AND INVESTMENTS - Additional Information (Details) $ in Millions	Mar. 31, 2021USD ($)
Cash and Cash Equivalents [Abstract]
Purchase of non-marketable equity securities	$ 10

DERIVATIVE INSTRUMENTS - Notion

DERIVATIVE INSTRUMENTS - Notional Amounts and Fair Values of Derivatives (Details) - Interest rate lock commitments - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Notional Amount	$ 17,958	$ 15,130
Derivative asset	414	373
Fair Value Derivatives, liability	$ 0	$ 0

DERIVATIVE INSTRUMENTS - Deriva

DERIVATIVE INSTRUMENTS - Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gain (loss)	$ 41	$ 48
Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gain (loss)	$ 0	$ (4)

VARIABLE INTEREST ENTITIES (Det

VARIABLE INTEREST ENTITIES (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
ASSETS
Cash and cash equivalents		$ 2,039,876	$ 1,412,665	$ 409,257
Restricted cash		143,311	92,863
Real estate inventory		840,632	465,936
TOTAL ASSETS	[1]	3,271,712	2,175,582
Liabilities
Total liabilities	[2]	888,151	622,924
Variable Interest Entity, Primary Beneficiary
ASSETS
Cash and cash equivalents		9,108	15,849
Restricted cash		133,887	81,408
Real estate inventory		820,961	460,680
Other		29,059	6,729
TOTAL ASSETS		993,015	564,666
Liabilities
Credit facilities		725,247	474,640
Other		5,310	3,394
Total liabilities		$ 730,557	$ 478,034
[1]	The Company’s consolidated assets at March 31, 2021 and December 31, 2020 include the following assets of certain variable interest entities (“VIEs”) that can only be used to settle the liabilities of those VIEs: Cash and cash equivalents, $9,108 and $15,849; Restricted cash, $133,887 and $81,408; Real estate inventory, net, $820,961 and $460,680; Escrow receivable, $18,839 and $1,364; Other current assets, $10,220 and $5,365; and Total assets of $993,015 and $564,666, respectively.
[2]	The Company’s consolidated liabilities at March 31, 2021 and December 31, 2020 include the following liabilities for which the VIE creditors do not have recourse to Opendoor: Accounts payable and other accrued liabilities, $4,090 and $2,335; Interest payable, $1,220 and $1,059; Current portion of credit facilities and other secured borrowings, $588,774 and $339,173; Credit facilities, net of current portion, $136,473 and $135,467; and Total liabilities, $730,557 and $478,034, respectively.

CREDIT FACILITIES AND LONG-TE_3

CREDIT FACILITIES AND LONG-TERM DEBT - Schedule of Long Term Debt Instruments (Details) - Revolving Credit Facility - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Borrowing Capacity	$ 2,655,000
Long-term Line of Credit	588,774	$ 339,173
Revolving Facility 2018-1
Debt Instrument [Line Items]
Long-term Line of Credit		$ 0
Weighted average interest rate (in percent)		4.28%
Revolving Facility 2018-2
Debt Instrument [Line Items]
Borrowing Capacity	750,000
Long-term Line of Credit	$ 0	$ 0
Weighted average interest rate (in percent)	0.00%	4.36%
Revolving Facility 2018-3
Debt Instrument [Line Items]
Borrowing Capacity	$ 100,000
Long-term Line of Credit	$ 30,472	$ 25,385
Weighted average interest rate (in percent)	3.62%	4.19%
Revolving Facility 2019-1
Debt Instrument [Line Items]
Borrowing Capacity	$ 300,000
Long-term Line of Credit	$ 50,893	$ 32,535
Weighted average interest rate (in percent)	2.86%	3.58%
Revolving Facility 2019-2
Debt Instrument [Line Items]
Borrowing Capacity	$ 1,030,000
Long-term Line of Credit	$ 398,952	$ 230,352
Weighted average interest rate (in percent)	2.70%	3.08%
Revolving Facility 2019-3
Debt Instrument [Line Items]
Borrowing Capacity	$ 475,000
Long-term Line of Credit	$ 108,457	$ 50,901
Weighted average interest rate (in percent)	3.25%	3.60%

CREDIT FACILITIES AND LONG-TE_4

CREDIT FACILITIES AND LONG-TERM DEBT - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total principal outstanding	$ 140,000
Borrowing Capacity	449,000
Revolving Credit Facility
Debt Instrument [Line Items]
Debt facility	2,655,000
Long-term Debt
Debt Instrument [Line Items]
Total principal outstanding	140,000
Unused borrowing capacity	309,000
Secured Debt
Debt Instrument [Line Items]
Total principal outstanding	8,200
Secured Debt | Repo Facility 2019-R1
Debt Instrument [Line Items]
Total principal outstanding	7,789	$ 7,149
Borrowing Capacity	50,000
Amount fully committed	20,000
Multiple Senior Revolving Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Debt facility	2,655,000
Fully committed borrowing capacity	$ 1,464,500
Term	24 months

CREDIT FACILITIES AND LONG-TE_5

CREDIT FACILITIES AND LONG-TERM DEBT - Schedule of Debt (Details) $ in Thousands	Mar. 31, 2021USD ($)
Debt Instrument [Line Items]
Borrowing Capacity	$ 449,000
Outstanding Amount	140,000
Issuance Costs	(3,527)
Carrying Value	136,473
Long-term Debt
Debt Instrument [Line Items]
Outstanding Amount	140,000
Long-term Debt | Term Debt Facility 2016-M1
Debt Instrument [Line Items]
Borrowing Capacity	149,000
Outstanding Amount	$ 40,000
Interest rate (in percent)	10.00%
Long-term Debt | Term Debt Facility 2020-M1
Debt Instrument [Line Items]
Borrowing Capacity	$ 300,000
Outstanding Amount	$ 100,000
Interest rate (in percent)	10.00%

CREDIT FACILITIES AND LONG-TE_6

CREDIT FACILITIES AND LONG-TERM DEBT - Mortgage Financing (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Borrowing Capacity	$ 449,000
Outstanding Amount	140,000
Secured Debt
Debt Instrument [Line Items]
Outstanding Amount	8,200
Repo Facility 2019-R1 | Secured Debt
Debt Instrument [Line Items]
Borrowing Capacity	50,000
Outstanding Amount	$ 7,789	$ 7,149
Weighted average interest rate (in percent)	1.94%	1.94%
Amount fully committed	$ 20,000

FAIR VALUE DISCLOSURES - Fair V

FAIR VALUE DISCLOSURES - Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets, Fair Value Disclosure [Abstract]
Fair Value	$ 127,885
Liabilities, Fair Value Disclosure [Abstract]
Warrants outstanding	62,621	$ 47,349
Interest rate lock commitments
Assets, Fair Value Disclosure [Abstract]
Derivative asset	414	373
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Fair Value	83,884	81,038
Corporate debt securities
Assets, Fair Value Disclosure [Abstract]
Fair Value	30,208	29,915
U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Fair Value	6,999	6,995
Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Fair Value	6,794	12,533
U.S. Treasury securities
Assets, Fair Value Disclosure [Abstract]
Fair Value		1,700
Fair Value, Recurring
Assets, Fair Value Disclosure [Abstract]
Mortgage loans held for sale pledged under agreements to repurchase	8,307	7,529
Total assets	67,340	55,539
Liabilities, Fair Value Disclosure [Abstract]
Warrants outstanding	62,621	47,349
Total liabilities	62,621	47,349
Fair Value, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Mortgage loans held for sale pledged under agreements to repurchase	0	0
Total assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Warrants outstanding	0	0
Total liabilities	0	0
Fair Value, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Mortgage loans held for sale pledged under agreements to repurchase	8,307	7,529
Total assets	66,926	55,539
Liabilities, Fair Value Disclosure [Abstract]
Warrants outstanding	62,621	47,349
Total liabilities	62,621	47,349
Fair Value, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Mortgage loans held for sale pledged under agreements to repurchase	0	0
Total assets	414	0
Liabilities, Fair Value Disclosure [Abstract]
Warrants outstanding	0	0
Total liabilities	0	0
Fair Value, Recurring | Interest rate lock commitments
Assets, Fair Value Disclosure [Abstract]
Derivative asset	414	373
Fair Value, Recurring | Interest rate lock commitments | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Derivative asset
Fair Value, Recurring | Interest rate lock commitments | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Derivative asset	0	373
Fair Value, Recurring | Interest rate lock commitments | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Derivative asset	414
Fair Value, Recurring | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Fair Value	23,640
Fair Value, Recurring | Commercial paper | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Fair Value	0
Fair Value, Recurring | Commercial paper | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Fair Value	23,640
Fair Value, Recurring | Commercial paper | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Fair Value	0
Fair Value, Recurring | Corporate debt securities
Assets, Fair Value Disclosure [Abstract]
Fair Value	21,186	26,409
Fair Value, Recurring | Corporate debt securities | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Fair Value, Recurring | Corporate debt securities | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Fair Value	21,186	26,409
Fair Value, Recurring | Corporate debt securities | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Fair Value, Recurring | U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Fair Value	6,999	6,995
Fair Value, Recurring | U.S. agency securities | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Fair Value, Recurring | U.S. agency securities | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Fair Value	6,999	6,995
Fair Value, Recurring | U.S. agency securities | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Fair Value, Recurring | Asset-backed securities
Assets, Fair Value Disclosure [Abstract]
Fair Value	6,794	12,533
Fair Value, Recurring | Asset-backed securities | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Fair Value	0	0
Fair Value, Recurring | Asset-backed securities | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Fair Value	6,794	12,533
Fair Value, Recurring | Asset-backed securities | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Fair Value	$ 0	0
Fair Value, Recurring | U.S. Treasury securities
Assets, Fair Value Disclosure [Abstract]
Fair Value		1,700
Fair Value, Recurring | U.S. Treasury securities | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Fair Value		0
Fair Value, Recurring | U.S. Treasury securities | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Fair Value		1,700
Fair Value, Recurring | U.S. Treasury securities | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Fair Value		$ 0

FAIR VALUE DISCLOSURES - Fair_2

FAIR VALUE DISCLOSURES - Fair Value Disclosure of Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Inputs, Level 1
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash and cash equivalents	$ 2,039,876	$ 1,412,665
Non-marketable equity securities	0
Credit facilities and other secured borrowings	0	0
Fair Value, Inputs, Level 1 | Restricted Cash
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash and cash equivalents	143,311	92,863
Fair Value, Inputs, Level 2
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash and cash equivalents	0	0
Non-marketable equity securities	10,000
Credit facilities and other secured borrowings	736,563	486,322
Fair Value, Inputs, Level 2 | Restricted Cash
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash and cash equivalents	0	0
Reported Value Measurement
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash and cash equivalents	2,039,876	1,412,665
Non-marketable equity securities	10,000
Credit facilities and other secured borrowings	733,036	481,789
Reported Value Measurement | Restricted Cash
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash and cash equivalents	143,311	92,863
Estimate of Fair Value Measurement
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash and cash equivalents	2,039,876	1,412,665
Non-marketable equity securities	10,000
Credit facilities and other secured borrowings	736,563	486,322
Estimate of Fair Value Measurement | Restricted Cash
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash and cash equivalents	$ 143,311	$ 92,863

FAIR VALUE DISCLOSURES - Unobse

FAIR VALUE DISCLOSURES - Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Warrants
Servicing Liability at Fair Value, Amount [Roll Forward]
Beginning balance	$ 0	$ 4,538
Net change in fair value		1,012
Additions	0
Ending balance	0	5,550
Embedded Conversion Option
Servicing Liability at Fair Value, Amount [Roll Forward]
Beginning balance	0	41,697
Net change in fair value		0
Additions	0
Ending balance	0	41,697
Interest rate lock commitments
Servicing Liability at Fair Value, Amount [Roll Forward]
Beginning balance	0	0
Net change in fair value		0
Additions	414
Ending balance	$ 414	$ 0

PROPERTY AND EQUIPMENT (Details

PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 68,253		$ 63,486
Accumulated depreciation and amortization	(37,211)		(34,258)
Property and equipment – net	31,042		29,228
Depreciation and amortization expense	5,600	$ 5,000
Internally developed software
Property, Plant and Equipment [Line Items]
Property, plant and equipment	52,030		47,823
Computers
Property, Plant and Equipment [Line Items]
Property, plant and equipment	6,260		5,511
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment	2,992		3,279
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	2,178		2,456
Office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,777		2,056
Software implementation costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,789		1,680
Security systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,227		$ 681

GOODWILL AND INTANGIBLE ASSET_2

GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill acquisition cost	$ 0		$ 0
Goodwill, impairment loss	0	$ 0
Domain names for intangible assets	200,000		$ 200,000
Amortization expense of intangible assets	$ 600,000	$ 1,100,000

GOODWILL AND INTANGIBLE ASSET_3

GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 15,821	$ 15,821
Accumulated Amortization	(7,875)	(7,295)
Net Carrying Amount	7,946	8,526
Developed technology
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	2,921	2,921
Accumulated Amortization	(2,921)	(2,921)
Net Carrying Amount	$ 0	$ 0
Remaining Weighted Average Useful Life (Years)	0 years	0 years
Customer relationships
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,400	$ 7,400
Accumulated Amortization	(2,947)	(2,622)
Net Carrying Amount	$ 4,453	$ 4,778
Remaining Weighted Average Useful Life (Years)	3 years 4 months 24 days	3 years 8 months 12 days
Trademarks
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 5,400	$ 5,400
Accumulated Amortization	(1,907)	(1,652)
Net Carrying Amount	$ 3,493	$ 3,748
Remaining Weighted Average Useful Life (Years)	3 years 4 months 24 days	3 years 8 months 12 days
Non-competition agreements
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 100	$ 100
Accumulated Amortization	(100)	(100)
Net Carrying Amount	$ 0	$ 0
Remaining Weighted Average Useful Life (Years)	0 years	0 years

GOODWILL AND INTANGIBLE ASSET_4

GOODWILL AND INTANGIBLE ASSETS - Expected Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
2021	$ 1,740
2022	2,320
2023	2,320
2024	1,566
Net Carrying Amount	$ 7,946	$ 8,526

SHAREHOLDERS_ EQUITY (Details)

SHAREHOLDERS’ EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions	Feb. 11, 2021	Feb. 09, 2021
Public Offering And Over-Allotment Option
Class of Stock [Line Items]
Shares sold (in shares)		32,817,421
Common stock price per PIPE Shares (in usd per share)		$ 27
Net proceeds from offering		$ 859.5
Over-Allotment Option
Class of Stock [Line Items]
Shares sold (in shares)	4,280,533

SHARE-BASED AWARDS - Stock Opti

SHARE-BASED AWARDS - Stock Options and RSUs Information (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2021shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Vesting period	4 years
Incentive Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	5 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	7 years
Vesting period	4 years

SHARE-BASED AWARDS - Stock Op_2

SHARE-BASED AWARDS - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2021
Number of Options
Beginning balance (in shares)	24,158
Exercised (in shares)	(99)
Forfeited (in shares)	(92)
Expired (in shares)	(2)
Ending balance (in shares)	23,965	24,158
Exercisable (in shares)			19,766
Weighted-Average Exercise Price
Beginning balance (in dollars per share)	$ 1.91
Exercised (in dollars per share)	2.65
Forfeited (in dollars per share)	2.58
Expired (in dollars per share)	3.02
Ending balance (in dollars per share)	$ 1.91	$ 1.91	$ 1.91
Exercisable (in dollars per share)			$ 1.61
Weighted-Average Remaining Contractual Term (in years) and Aggregate Intrinsic Value
Weighted-average remaining contractual term (in years), outstanding	5 years 1 month 6 days	5 years 4 months 24 days
Weighted-average remaining contractual term (in years), exercisable	4 years 6 months
Aggregate intrinsic values		$ 502,767	$ 461,961
Exercisable, aggregate intrinsic value			$ 387,097

SHARE-BASED AWARDS - RSU and Re

SHARE-BASED AWARDS - RSU and Restricted Share Activity (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2021$ / sharesshares
RSUs
Number of RSUs
Beginning balance (in shares) | shares	46,525
Granted (in shares) | shares	17,471
Vested (in shares) | shares	(11,737)
Forfeited (in shares) | shares	(153)
Ending balance (in shares) | shares	52,106
Weighted- Average Grant-Date Fair Value
Beginning balance | $ / shares	$ 10.88
Granted (in dollars per share) | $ / shares	21.77
Vested (in dollars per share) | $ / shares	4.95
Forfeited (in dollars per share) | $ / shares	5.63
Ending balance | $ / shares	$ 15.88
Restricted Shares
Number of RSUs
Beginning balance (in shares) | shares	2,148
Granted (in shares) | shares	0
Vested (in shares) | shares	(311)
Ending balance (in shares) | shares	1,837
Vested and outstanding (in shares) | shares	0
Weighted- Average Grant-Date Fair Value
Beginning balance | $ / shares	$ 3.74
Granted (in dollars per share) | $ / shares	0
Vested (in dollars per share) | $ / shares	3.58
Ending balance | $ / shares	3.76
Vested and outstanding (in dollars per share) | $ / shares	$ 0

SHARE-BASED AWARDS - Restricted

SHARE-BASED AWARDS - Restricted Shares (Details) - Restricted Shares	3 Months Ended
	Mar. 31, 2021
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years

SHARE-BASED AWARDS - Expense an

SHARE-BASED AWARDS - Expense and Capitalized (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 238,832	$ 2,970
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	197,036	1,554
Sales, marketing and operations
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	6,406	352
Technology and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 35,390	$ 1,064

SHARE-BASED AWARDS - Stock-Base

SHARE-BASED AWARDS - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 238,832	$ 2,970
Market Condition Award | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value for awards	22,400		$ 357,400
Stock-based compensation expense	$ 133,200
Market Condition Award | Executive Officer | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period	6 months		6 months
Market Condition Award | Executive Officer | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period	3 years		3 years 6 months
Unvested Stock Options and Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation	$ 651,800
Unamortized stock-based compensation period (in years)	2 years 8 months 12 days

WARRANTS - Public and Sponsor W

WARRANTS - Public and Sponsor Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2020	Apr. 30, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 18, 2020
Class of Warrant or Right [Line Items]
Warrants to purchase shares (in shares)	19,933,333		19,933,333
Exercise price of warrants (in dollars per share)			$ 11.50
Warrants to purchase share of Class A common stock		1
Warrant term		5 years
Exercise price of warrants (in dollars per share)			0.01
Reference value (in dollars per share)			$ 18
Warrants to purchase shares (in shares)			19,933,333
Warrants outstanding	$ 47,349		$ 62,621
Derivative and warrant fair value adjustment			15,272	$ 1,012
Sponsor Warrants
Class of Warrant or Right [Line Items]
Warrants outstanding	47,300		62,600		$ 81,100
Derivative and warrant fair value adjustment	(33,800)
Fair Value, Recurring
Class of Warrant or Right [Line Items]
Warrants outstanding	$ 47,349		$ 62,621
Sponsor Warrants
Class of Warrant or Right [Line Items]
Warrants to purchase shares (in shares)		6,133,333
Exercise price of warrants (in dollars per share)		$ 11.50
Warrants to purchase share of Class A common stock		1
Warrant exercise period following completion of business combination		30 days
Warrant exercise period following close of initial public offering		12 months
Reference value (in dollars per share)			$ 18
Public Warrants
Class of Warrant or Right [Line Items]
Warrants to purchase shares (in shares)		13,800,000
Exercise price of warrants (in dollars per share)		$ 11.50
Warrants to purchase share of Class A common stock		1
Exercise price of warrants (in dollars per share)			0.10
Public Warrants | Minimum
Class of Warrant or Right [Line Items]
Reference value (in dollars per share)			10
Public Warrants | Maximum
Class of Warrant or Right [Line Items]
Reference value (in dollars per share)			$ 18

WARRANTS - Warrants to Purchase

WARRANTS - Warrants to Purchase Series D Preferred Stock (Details) - USD ($)	Nov. 12, 2020	Nov. 07, 2020	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 12, 2018
Class of Warrant or Right [Line Items]
Warrants to purchase shares (in shares)			19,933,333
Exercise price of warrants (in dollars per share)			$ 11.50
Warrants to purchase shares (in shares)			19,933,333	19,933,333
Series D, Penny warrants
Class of Warrant or Right [Line Items]
Warrants to purchase shares (in shares)							485,262
Exercise price of warrants (in dollars per share)							$ 0.006
Shares exercised and issued (in shares)	485,262
Proceeds from exercises	$ 3,000
Warrants to purchase shares (in shares)			0
Series E Warrants
Class of Warrant or Right [Line Items]
Warrants to purchase shares (in shares)					121,356	242,713
Exercise price of warrants (in dollars per share)					$ 5.92
Shares exercised and issued (in shares)		364,069
Proceeds from exercises		$ 2,200,000
Warrants to purchase shares (in shares)			0

WARRANTS - Commitment to Issue

WARRANTS - Commitment to Issue Warrants (Details) - USD ($)	Nov. 07, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Class of Warrant or Right [Line Items]
Warrants to purchase shares (in shares)		19,933,333
Exercise price of warrants (in dollars per share)		$ 11.50
Increase to the warrant fair value adjustments		$ 15,272,000	$ 1,012,000
Warrants to purchase shares (in shares)		19,933,333		19,933,333
Series E Warrants
Class of Warrant or Right [Line Items]
Warrants to purchase shares (in shares)					121,356	242,713
Exercise price of warrants (in dollars per share)					$ 5.92
Proceeds from exercises	$ 2,200,000
Shares exercised and issued (in shares)	364,069
Increase to the warrant fair value adjustments		$ 0	$ 1,000,000
Warrants to purchase shares (in shares)		0

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income tax provision	$ 94	$ 120
Effective tax rate	0.03%	0.19%

RELATED PARTIES (Details)

RELATED PARTIES (Details) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021home	Dec. 31, 2019USD ($)$ / sharesshares
Director
Related Party Transaction [Line Items]
Number of preferred stock investors	1
Number of seats held in company	1
Director | Customer Concentration Risk
Related Party Transaction [Line Items]
Percentage of interest holding (in percent)	10.00%
Executive Officer
Related Party Transaction [Line Items]
Unvested common stock purchased (in shares) | shares		1,479,459
Share price (in dollars per share) | $ / shares		$ 1.01
Consideration for purchase of unvested common stock | $		$ 1.5
Interest rate (in percent)		2.31%

NET LOSS PER SHARE - Narrative

NET LOSS PER SHARE - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Dividends declared	$ 0	$ 0
Preferred dividends declared	$ 0

NET LOSS PER SHARE - Earnings P

NET LOSS PER SHARE - Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
NET LOSS	$ (270,436)	$ (62,196)
Weighted average shares outstanding – basic and diluted	565,381	84,027
Net loss per share, basic and diluted (in dollars per share)	$ (0.48)	$ (0.74)

NET LOSS PER SHARE - Antidiluti

NET LOSS PER SHARE - Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	97,877	379,135
Warrants | Common Stock Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	19,933	3,370
Warrants | Series D Preferred Stock Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	485
Warrants | Series E Preferred Stock Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	121
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	52,106	22,839
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	23,965	34,680
Unvested Shares from Early Exercise
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	36	136
Restricted Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,837	3,080
Redeemable convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	314,424

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)home	Mar. 31, 2020USD ($)
Commitments and Contingencies Disclosure [Abstract]
Amount of homes purchased under contract | home	4,027
Aggregate purchase price for homes	$ 1,302,500
Gain on settlement of lease liabilities	$ 5,237	$ 0

SUBSEQUENT EVENTS (Details)

SUBSEQUENT EVENTS (Details) - Subsequent Event - Line of Credit - Senior Term Debt Facility	Apr. 01, 2021USD ($)
Subsequent Event [Line Items]
Debt facility	$ 400,000,000
Interest rate (in percent)	3.48%