DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES (Policies)	9 Months Ended
Sep. 30, 2022
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 residential real estate. By leveraging software, data science, product design and operations, Opendoor has rebuilt the service model for real estate and has made buying and selling possible on a mobile device. 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 September 30, 2022 and December 31, 2021 and for the three and nine month periods ended September 30, 2022 and 2021 include the accounts of Opendoor, its wholly owned subsidiaries and VIEs where the Company is the primary beneficiary. The accompanying unaudited condensed 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 intercompany accounts and transactions have been eliminated in the condensed consolidated financial statements herein. Certain prior period amounts in the condensed consolidated financial statements and accompanying notes have been reclassified to conform to the current period’s presentation. The Company was formed through a business combination with Social Capital Hedosophia Holdings Corp. II (“SCH”), a Cayman Islands exempted company formed for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses (the “Business Combination”). The Business Combination, pursuant to which Opendoor Labs Inc. became a wholly owned subsidiary of SCH and SCH changed its name from “Social Capital Hedosophia Holdings Corp. II” to “Opendoor Technologies Inc.”, was completed on December 18, 2020, and was accounted for as a reverse recapitalization, in accordance with GAAP. 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, 2021 (“Annual Report”) filed on February 24, 2022.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that have a material impact on the amounts reported in the financial statements and accompanying notes. Significant estimates, assumptions and judgments made by management include, among others, the determination of the fair value of common stock, share-based awards, warrants, and inventory valuation adjustment. Management believes that the estimates and judgments upon which management relies are reasonable based upon information available to management at the time that these estimates and judgments are made. To the extent there are material differences between these estimates, assumptions and judgments and actual results, the carrying values of the Company's assets and liabilities and the results of operations will be affected. The health of the residential housing market and interest rate environment have introduced additional uncertainty with respect to judgments, estimates and assumptions, which may materially impact the estimates previously listed, among others.
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 inventory; 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 for and pricing of its products and on the cost of capital; changes in technology, products, markets or services by the Company or its competitors; 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, restricted cash, and investments in marketable securities. 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.
Investments	Investments The Company’s investments in marketable securities consist of debt securities classified as available-for-sale as well as marketable equity securities. The Company's available-for-sale debt securities are measured at fair value with unrealized gains and losses included in Accumulated other comprehensive loss in shareholders' equity and realized gains and losses included in Other (loss) income-net.
Non-Marketable Equity Securities	The Company’s strategic investments consist of a marketable equity security, which is publicly traded, and non-marketable equity securities, which are investments in privately held companies. Marketable equity securities have readily determinable fair values with changes in fair value recorded in Other (loss) income-net. Non-marketable equity securities and equity method investments do not have readily determinable fair values. These securities are accounted for under one of the following accounting methods: •Equity method: This method is applied when the Company has the ability to exert significant influence over the investee. The securities are recorded at cost and adjusted for the Company’s share of the investee’s earnings or losses, less any dividends received and/or impairments. •Measurement alternative: This method is followed for all remaining non-marketable equity securities. These securities are recorded 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. All realized and unrealized gains and losses or the Company's share of the investee's earnings or losses, including impairment losses, are recognized in Other (loss) income-net. Any dividends on equity method investments are recognized as a reduction of the investment's carrying value. Non-marketable equity securities are reported in Other assets. The Company assesses whether an impairment loss on its non-marketable equity securities has occurred due to declines in fair value or other market conditions. When the fair value of an equity method investment is less than its carrying value, the Company writes down the investment to fair value when the decline in value is considered to be other than temporary. When the fair value of an investment accounted for using the measurement alternative is less than its carrying value, the Company writes down the investment to its fair value, without the consideration of recovery. See “Note 4 — Cash, Cash Equivalents, and Investments” for further discussion.
Real Estate Inventory	Real Estate Inventory Real estate inventory is carried at the lower of cost or net realizable value and the Company applies the specific identification method whereby each property constitutes the unit of account. Real estate inventory cost includes but is not limited to the property purchase price, acquisition costs and direct costs to renovate or repair the home, less inventory valuation adjustments, if any. Work in progress inventory includes homes undergoing repairs and finished goods inventory includes homes that are listed for sale, including homes ready for listing, and homes under contract for sale. Real estate inventory is reviewed for valuation adjustments at least quarterly. If the carrying amount or cost basis is not expected to be recovered, an inventory valuation adjustment is recorded to Cost of revenue and the related assets are adjusted to their net realizable 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-lived 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.
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation awards consist of stock options, restricted stock units (“RSUs”), shares of restricted stock (“Restricted Shares”), and shares issued pursuant the 2020 Employee Stock Purchase Plan ("ESPP"). Stock Options The Company has granted stock options with a service condition to vest, which is generally four years. The Company records stock-based compensation expense for service-based stock options on a straight-line basis over the requisite service period. These amounts are reduced by forfeitures as they occur. The Company uses the Black-Scholes-Merton option-pricing model to determine the fair value as of the grant date for stock options. RSUs Prior to its listing, the Company granted RSUs with a performance condition, based on a liquidity event, as defined by the share agreement, as well as a service condition to vest, which was generally four years. The Company determined the fair value of RSUs based on the valuation of the Company’s common stock as of the grant date. No compensation expense was recognized for performance-based awards until the liquidity event occurred in February 2021. Subsequent to the occurrence of the liquidity event, compensation expense was recognized on an accelerated attribution basis over the requisite service period of the awards. After the Company became listed, the RSUs granted are generally only subject to a service condition to vest and typically vest over one to four years. Compensation expense is recognized on a straight-line basis subject to a floor of the vested number of shares for each award. Market Condition RSUs The Company has granted RSUs with a performance condition, based on a liquidity event, as defined by the share agreement, as well as a market condition to vest. Subject to the employee’s continued services to the Company, the market-based conditions are satisfied upon the Company’s achievement of certain share price milestones calculated based on 60-day volume weighted average. For market-based RSUs, the Company determines the grant-date fair value utilizing Monte Carlo simulations, which incorporates various assumptions, including expected stock price volatility, contractual term, dividend yield, and stock price at grant date. The Company estimates the volatility of common stock on the date of grant based on the weighted-average historical stock price volatility of comparable publicly-traded companies. As the Company had no history of dividend payments and had not declared any prospective dividends, a 0% dividend yield was assumed. For stock-based compensation, each market-based condition is treated as an accounting unit and expense is recognized over the requisite service period with respect to each unit and only if performance-based conditions are considered probable to be satisfied. The Company determines the requisite service period by comparing the derived service period to achieve the market-based condition and the explicit service-based period, if any, using the longer of the two service periods as the requisite service period. Restricted Shares The fair value of the Restricted Shares is equal to the estimated fair value of the Company’s common stock on the grant date. The Company recognizes compensation expense for the shares on a straight-line basis over the requisite service period of the awards. The fair value of these shares will be recognized into common stock and additional paid-in-capital as the shares vest. ESPP The Company recognizes stock-based compensation expense related to purchase rights granted pursuant to the 2020 ESPP on a straight-line basis over the offering period. The Company estimates the fair value of purchase rights granted under the ESPP using the Black-Scholes option-pricing model.

DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES (Policies)

9 Months Ended

Sep. 30, 2022

Opendoor Technologies Inc. (the “Company” and “Opendoor”) including its consolidated subsidiaries and certain variable interest entities (“VIEs”), is a leading digital platform for residential real estate. By leveraging software, data science, product design and operations, Opendoor has rebuilt the service model for real estate and has made buying and selling possible on a mobile device. The Company was incorporated in Delaware on December 30, 2013.

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 September 30, 2022 and December 31, 2021 and for the three and nine month periods ended September 30, 2022 and 2021 include the accounts of Opendoor, its wholly owned subsidiaries and VIEs where the Company is the primary beneficiary. The accompanying unaudited condensed 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 intercompany accounts and transactions have been eliminated in the condensed consolidated financial statements herein. Certain prior period amounts in the condensed consolidated financial statements and accompanying notes have been reclassified to conform to the current period’s presentation.

The Company was formed through a business combination with Social Capital Hedosophia Holdings Corp. II (“SCH”), a Cayman Islands exempted company formed for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses (the “Business Combination”). The Business Combination, pursuant to which Opendoor Labs Inc. became a wholly owned subsidiary of SCH and SCH changed its name from “Social Capital Hedosophia Holdings Corp. II” to “Opendoor Technologies Inc.”, was completed on December 18, 2020, and was accounted for as a reverse recapitalization, in accordance with GAAP.

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, 2021 (“Annual Report”) filed on February 24, 2022.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that have a material impact on the amounts reported in the financial statements and accompanying notes. Significant estimates, assumptions and judgments made by management include, among others, the determination of the fair value of common stock, share-based awards, warrants, and inventory valuation adjustment. Management believes that the estimates and judgments upon which management relies are reasonable based upon information available to management at the time that these estimates and judgments are made. To the extent there are material differences between these estimates, assumptions and judgments and actual results, the carrying values of the Company's assets and liabilities and the results of operations will be affected. The health of the residential housing market and interest rate environment have introduced additional uncertainty with respect to judgments, estimates and assumptions, which may materially impact the estimates previously listed, among others.

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 inventory; 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 for and pricing of its products and on the cost of capital; changes in technology, products, markets or services by the Company or its competitors; 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, restricted cash, and investments in marketable securities. 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.

Investments

The Company’s investments in marketable securities consist of debt securities classified as available-for-sale as well as marketable equity securities. The Company's available-for-sale debt securities are measured at fair value with unrealized gains and losses included in Accumulated other comprehensive loss in shareholders' equity and realized gains and losses included in Other (loss) income-net.

Non-Marketable Equity Securities

The Company’s strategic investments consist of a marketable equity security, which is publicly traded, and non-marketable equity securities, which are investments in privately held companies. Marketable equity securities have readily determinable fair values with changes in fair value recorded in Other (loss) income-net. Non-marketable equity securities and equity method investments do not have readily determinable fair values. These securities are accounted for under one of the following accounting methods:

•Equity method: This method is applied when the Company has the ability to exert significant influence over the investee. The securities are recorded at cost and adjusted for the Company’s share of the investee’s earnings or losses, less any dividends received and/or impairments.

•Measurement alternative: This method is followed for all remaining non-marketable equity securities. These securities are recorded 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.

All realized and unrealized gains and losses or the Company's share of the investee's earnings or losses, including impairment losses, are recognized in Other (loss) income-net. Any dividends on equity method investments are recognized as a reduction of the investment's carrying value. Non-marketable equity securities are reported in Other assets.

The Company assesses whether an impairment loss on its non-marketable equity securities has occurred due to declines in fair value or other market conditions. When the fair value of an equity method investment is less than its carrying value, the Company writes down the investment to fair value when the decline in value is considered to be other than temporary. When the fair value of an investment accounted for using the measurement alternative is less than its carrying value, the Company writes down the investment to its fair value, without the consideration of recovery. See “Note 4 — Cash, Cash Equivalents, and Investments” for further discussion.

Real Estate Inventory

Real estate inventory is carried at the lower of cost or net realizable value and the Company applies the specific identification method whereby each property constitutes the unit of account. Real estate inventory cost includes but is not limited to the property purchase price, acquisition costs and direct costs to renovate or repair the home, less inventory valuation adjustments, if any. Work in progress inventory includes homes undergoing repairs and finished goods inventory includes

homes that are listed for sale, including homes ready for listing, and homes under contract for sale. Real estate inventory is reviewed for valuation adjustments at least quarterly. If the carrying amount or cost basis is not expected to be recovered, an inventory valuation adjustment is recorded to Cost of revenue and the related assets are adjusted to their net realizable 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-lived 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.

Stock-Based Compensation

Stock-based compensation awards consist of stock options, restricted stock units (“RSUs”), shares of restricted stock (“Restricted Shares”), and shares issued pursuant the 2020 Employee Stock Purchase Plan ("ESPP").

Stock Options

The Company has granted stock options with a service condition to vest, which is generally four years. The Company records stock-based compensation expense for service-based stock options on a straight-line basis over the requisite service period. These amounts are reduced by forfeitures as they occur. The Company uses the Black-Scholes-Merton option-pricing model to determine the fair value as of the grant date for stock options.

RSUs

Prior to its listing, the Company granted RSUs with a performance condition, based on a liquidity event, as defined by the share agreement, as well as a service condition to vest, which was generally four years. The Company determined the fair value of RSUs based on the valuation of the Company’s common stock as of the grant date. No compensation expense was recognized for performance-based awards until the liquidity event occurred in February 2021. Subsequent to the occurrence of the liquidity event, compensation expense was recognized on an accelerated attribution basis over the requisite service period of the awards. After the Company became listed, the RSUs granted are generally only subject to a service condition to vest and typically vest over one to four years. Compensation expense is recognized on a straight-line basis subject to a floor of the vested number of shares for each award.

Market Condition RSUs

The Company has granted RSUs with a performance condition, based on a liquidity event, as defined by the share agreement, as well as a market condition to vest. Subject to the employee’s continued services to the Company, the market-based conditions are satisfied upon the Company’s achievement of certain share price milestones calculated based on 60-day volume weighted average.

For market-based RSUs, the Company determines the grant-date fair value utilizing Monte Carlo simulations, which incorporates various assumptions, including expected stock price volatility, contractual term, dividend yield, and stock price at grant date. The Company estimates the volatility of common stock on the date of grant based on the weighted-average historical stock price volatility of comparable publicly-traded companies. As the Company had no history of dividend payments and had not declared any prospective dividends, a 0% dividend yield was assumed.

For stock-based compensation, each market-based condition is treated as an accounting unit and expense is recognized over the requisite service period with respect to each unit and only if performance-based conditions are considered probable to be satisfied. The Company determines the requisite service period by comparing the derived service period to achieve the market-based condition and the explicit service-based period, if any, using the longer of the two service periods as the requisite service period.

Restricted Shares

The fair value of the Restricted Shares is equal to the estimated fair value of the Company’s common stock on the grant date. The Company recognizes compensation expense for the shares on a straight-line basis over the requisite service period of the awards. The fair value of these shares will be recognized into common stock and additional paid-in-capital as the shares vest.

ESPP

The Company recognizes stock-based compensation expense related to purchase rights granted pursuant to the 2020 ESPP on a straight-line basis over the offering period. The Company estimates the fair value of purchase rights granted under the ESPP using the Black-Scholes option-pricing model.