Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Information [Table] Document Information [Line Items] Document Type Amendment Flag Entity Registrant Name Entity Central Index Key Entity Filer Category Entity Small Business Entity Emerging Growth Company CONSOLIDATED BALANCE SHEETS Statement [Table] Legal Entity [Axis] Entity [Domain] Entity [Domain] n/a Social Capital [Member] Social Capital Member Class of Stock [Axis] Class Of Stock [Domain] Class of Stock [Domain] Common Class A [Member] Common Class A Common Class B [Member] Common Class B Statement [Line Items] Statement [Line Items] Assets [Abstract] ASSETS Assets Assets, Current [Abstract] CURRENT ASSETS: Current Assets Cash and Cash Equivalents, at Carrying Value Cash - Ending Cash - Beginning Cash and cash equivalents Cash and Cash Equivalents Prepaid Expense, Current Prepaid expenses Assets, Current Total current assets Deferred Offering Costs Deferred offering costs Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period. Deferred Offering Cost Assets Held-in-trust, Noncurrent Cash and Marketable securities held in Trust Account Assets TOTAL ASSETS Total assets Liabilities and Equity [Abstract] LIABILITIES, TEMPORARY EQUITY, AND SHAREHOLDERS' DEFICIT LIABILITIES AND SHAREHOLDER'S EQUITY (DEFICIT) Liabilities, Current [Abstract] CURRENT LIABILITIES: Current liabilities Accounts Payable and Accrued Liabilities, Current Total accounts payable and other accrued liabilities Accounts payable and accrued expenses Accrued Liabilities, Current Accrued expenses due to vendors Accrued expenses Carrying value as of the balance sheet date of obligations incurred through that date and payable for offering of shares. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Accrued Offering Costs, Current Accrued offering costs Amount of advances from related party. Advances From Related Party Advances from related party Notes Payable, Related Parties, Current Amount outstanding under promissory note Promissory note - related party Liabilities, Current Total current liabilities Amount of deferred underwriting fee payable as of the balance sheet date, classified as noncurrent. Deferred Underwriting Fee Payable, Noncurrent Deferred underwriting fee payable Liabilities Total liabilities Total liabilities Commitments and Contingencies COMMITMENTS AND CONTINGENCIES (See Note 19) Commitments Temporary Equity, Carrying Amount, Attributable to Parent BALANCE at the end BALANCE at the beginning Total temporary equity Total temporary equity Class A ordinary shares subject to possible redemption, 38,964,589 and no shares at redemption value at June 30, 2020 and December 31, 2019, respectively Stockholders' Equity Attributable to Parent [Abstract] Shareholder's Equity (Deficit) Preferred Stock, Value, Issued Preferred shares, $0.0001 par value; 5,000,000 shares authorized; none issued and outstanding Common Stock, Value, Issued Common stock, $0.0001 and $0.00001 par value, respectively; 3,000,000,000 and 485,262,910 shares authorized, respectively; 540,714,692 and 83,748,443 shares issued and outstanding, respectively Common Stock, Value, Issued Additional Paid in Capital Additional paid-in capital Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Balance Balance Total shareholders' equity (deficit) Liabilities and Equity TOTAL LIABILITIES, TEMPORARY EQUITY, AND SHAREHOLDERS' EQUITY DEFICIT Temporary Equity, Shares Outstanding BALANCE at the end (in shares) BALANCE at the beginning (in shares) Shares Outstanding (in shares) Ordinary shares subject to possible redemption (in shares) Preferred Stock, Par or Stated Value Per Share Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Outstanding Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Ordinary share, par value Common Stock, Shares Authorized Common stock, Shares Authorized (in shares) Common Stock, Shares, Issued Common stock, Shares Issued (in shares) Common Stock, Shares, Outstanding Common stock, Shares Outstanding (in shares) Maximum number of shares of common stock that were subject to forfeiture to the extent that the underwriters' over-allotment option was not exercised in full. Common stock represent the ownership interest in a corporation. Common Stock, Shares Subject To Forfeiture, Maximum Shares subject to forfeiture CONSOLIDATED STATEMENTS OF OPERATIONS Amount of formation and operating costs incurred by the company. Formation And Operating Costs Formation and operating costs Operating Income (Loss) LOSS FROM OPERATIONS Loss from operations Nonoperating Income (Expense) [Abstract] Other income: Investment Income, Interest Interest income Interest income on trust account Net Income (Loss) Attributable to Parent NET LOSS ATTRIBUTABLE TO OPENDOOR TECHNOLOGIES INC. Net loss Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted average shares outstanding, basic and diluted Earnings Per Share, Basic and Diluted Basic and diluted loss per ordinary share Basic and diluted net loss per ordinary share Temporary Equity, Net Income Income attributable to ordinary shares subject to possible redemption Less: Income attributable to ordinary shares subject to possible redemption CONSOLIDATED STATEMENTS OF CHANGES IN TEMPORARY EQUITY AND SHAREHOLDERS' DEFICIT Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock Additional Paid In Capital [Member] Additional Paid-in Capital Retained Earnings [Member] Accumulated Deficit Shares, Outstanding BALANCE at the end (in shares) BALANCE at the beginning (in shares) Amount of stock cancelled during the period. Stock Cancelled During Period Value Cancellation of Class B ordinary share Number of shares cancelled during period. Stock Cancelled During Period, Shares Cancellation of Class B ordinary share (in shares) Stock Issued During Period, Value, New Issues Capital contribution by sponsor Value of shares issued Issuance of stock Stock Issued During Period, Shares, New Issues Issuance of new shares Issuance of stock (in shares) Equity impact of the value of units issued during the period. Units Issued During Period, Value, New Issues Sale of 41,400,000 Units, net of underwriting discount and offering expenses Number of new units issued during the period. Units Issued During Period, Shares, New Issues Sale of 41,400,000 Units, net of underwriting discount and offering expenses (in shares) Adjustments to Additional Paid in Capital, Warrant Issued Issuance of warrants for services Sale of 6,133,333 Private Placement Warrants Equity impact of the value of stock reclassified to temporary equity during the period. Reclassification To Temporary Equity, Value Ordinary shares subject to redemption Number of shares reclassified to temporary equity during the period. Reclassification To Temporary Equity, Shares Ordinary shares subject to redemption (in shares) The amount of ordinary shares subject to possible redemption. Ordinary Shares Subject To Possible Redemption Value Change in value of ordinary shares subject to possible redemption The number of ordinary shares subject to possible redemption. Ordinary Shares Subject To Possible Redemption Shares Change in value of ordinary shares subject to possible redemption (in shares) The number of class of warrant or right issued during the period under Private Placement. Class of Warrant or Right, Numbers Issued Class of Warrant or Right, Numbers Issued Sale of 6,133,333 Private Placement Warrants (in shares) CONSOLIDATED STATEMENTS OF CASH FLOWS CASH FLOWS FROM OPERATING ACTIVITIES: Cash Flows from Operating Activities: Adjustments to reconcile net loss to cash, cash equivalents, and restricted cash provided by (used in) operating activities: Adjustments to reconcile net loss to net cash used in operating activities: Interest and Other Income Interest earned on cash and marketable securities held in Trust Account Changes in operating assets and liabilities: Changes in operating assets and liabilities: Increase (Decrease) in Prepaid Expense Prepaid expenses Increase (Decrease) in Accrued Liabilities Accrued expenses Net Cash Provided by (Used in) Operating Activities Net cash provided by (used in) operating activities CASH FLOWS FROM INVESTING ACTIVITIES: Cash Flows from Investing Activities: The cash outflow for the purchase of investments that will be held in a trust account. Payments To Acquire Investments To Be Held In Trust Account Investment of cash in Trust Account Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities CASH FLOWS FROM FINANCING ACTIVITIES: Cash Flows from Financing Activities: Payments for Repurchase of Common Stock Repurchase of common stock at fair value Redemption of Class A common shares Proceeds from Issuance of Common Stock Proceeds from issuance of Class B ordinary shares to Sponsor The cash inflow associated with the amount received from entity's sale of units, net of underwriting discounts paid. Proceeds From Sale Of Units, Net Of Underwriting Discounts Paid Proceeds from sale of Units, net of underwriting discounts paid Proceeds from Issuance of Warrants Proceeds from sale of Private Placement Warrants Aggregate purchase price Repayments of Related Party Debt Repayment of advances from related parties Proceeds from Related Party Debt Proceeds from promissory note - related party Advances from related party Repayments of Notes Payable Repayment of promissory note - related party Payment of Financing and Stock Issuance Costs Payment of offering costs Proceeds from Notes Payable Proceeds from promissory note Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Non-cash investing and financing activities: The amount of ordinary shares which initially classified subject to possible redemption in non cash financing activities. InitialClassificationOfOrdinarySharesSubjectToPossibleRedemption Initial classification of ordinary shares subject to possible redemption The amount of ordinary shares redemption value that were incurred during a noncash or partial noncash transaction. Change in Ordinary Shares Possible Redemption Value Change in value of ordinary shares subject to possible redemption Amount of underwriting fee payable by the company, deferred during the period. Underwriting Fee Deferred Deferred underwriting fee The amount of offering costs included in accrued offering costs. Offering Costs Included In Accrued Offering Costs Offering costs included in accrued offering costs DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS Organization and Plan of Business Operations DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES Significant Accounting Policies [Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies No definition available. INITIAL PUBLIC OFFERING The entire disclosure for initial public offering. Initial Public Offering, Disclosure [Text Block] INITIAL PUBLIC OFFERING No definition available. PRIVATE PLACEMENT The entire disclosure for the offerings made by the company under private placements and excludes offerings under public offering. Private Placement Disclosure [Text Block] PRIVATE PLACEMENT Private Placement RELATED PARTIES Related Party Transactions Disclosure [Text Block] RELATED PARTIES RELATED PARTY TRANSACTIONS COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES COMMITMENTS SHAREHOLDERS' EQUITY Stockholders' Equity Note Disclosure [Text Block] SHAREHOLDERS' EQUITY Shareholder's Equity FAIR VALUE DISCLOSURES Fair Value Disclosures [Text Block] FAIR VALUE DISCLOSURES FAIR VALUE MEASUREMENTS SUBSEQUENT EVENTS Subsequent Events [Text Block] SUBSEQUENT EVENTS Subsequent Events Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Consolidation, Policy [Policy Text Block] Principles of Consolidation Disclosure of accounting policy for an emerging growth company. Emerging Growth Company, Policy [Policy Text Block] Emerging Growth Company Emerging growth company Use of Estimates, Policy [Policy Text Block] Use of Estimates Use of estimates Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Cash and cash equivalents The disclosure of accounting policy for assets held in trust. Assets Held In Trust Account, Policy [Policy Text Block] Cash and Marketable Securities Held in Trust Account The disclosure of accounting policy on common stock subject to possible redemption. Common Stock Subject To Possible Redemption, Policy [Policy Text Block] Class A Ordinary Shares Subject to Possible Redemption Deferred Charges, Policy [Policy Text Block] Deferred offering costs Income Tax, Policy [Policy Text Block] Income Taxes Earnings Per Share, Policy [Policy Text Block] Net loss per share Net Loss per Ordinary Share Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentrations of Credit Risk Concentration of Credit Risk Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments Fair value of financial instruments New Accounting Pronouncements, Policy [Policy Text Block] Recently Issued Accounting Standards Recent Accounting Pronouncements Disclosure of accounting policy pertaining to an event or transaction that is unusual in nature or infrequent in occurrence, or both. Unusual or Infrequent Items and Risks, Policy [Policy Text Block] Risks and Uncertainties Marketable Securities, Policy [Policy Text Block] Marketable Securities Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of computation of our basic and diluted net loss per share attributable to common shareholders Schedule of computation of basic and diluted loss per ordinary share Fair Value, Assets Measured on Recurring Basis [Table Text Block] Schedule of assets measured at fair value on a recurring basis Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event Sale of Stock [Axis] Sale Of Stock Name Of Transaction [Domain] Sale of Stock [Domain] I P O [Member] Initial Public Offering Over Allotment Option [Member] Over-Allotment Option Private Placement [Member] Private placement Related Party [Axis] Related Party [Domain] Related Party [Domain] Sponsor Sponsor [Member] Sponsor Per share price at which the new stock issued during the period. Stock Issued During Period, Issue Price Per Share, New Issues Units issue price (in dollars per share) Proceeds from Issuance Initial Public Offering Gross proceeds from initial public offering Class of Warrant or Right, Number of Securities Called by Warrants or Rights Warrants to purchase shares Warrants to purchase shares of Series D Preferred Stock Per unit price at which the warrants were issued by the company. Class of Warrant or Right, Issue Price of Warrants or Rights Issue price of warrants (in dollars per share) Aggregate transaction costs incurred by the company for offering of stock. Stock Offering, Transaction Costs Transaction costs Amount of underwriting fees incurred by the company for offering of stock. Stock Offering, Underwriting Fees Underwriting fees Underwriting fees attributable to actual offering of securities which are deferred. Stock Offering, Deferred Underwriting Fees Deferred underwriting fees Amount of other costs incurred by the company for offering of stock. Stock Offering, Other Offering Costs Other offering costs Amount of cash available for working capital purposes. Cash Available For Working Capital Purposes Cash available for working capital purposes The maximum maturity term of investments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Investments, Maximum Maturity Term Maturity term of U.S. government securities Number of days prior to the completion of business combination considered for calculation of pro rata portion of the amount held in the Trust Account to entitle the Public Shareholders to redeem the shares. Redemption Of Shares By Public Shareholders, Number Of Days Considered Redemption of shares by Public Shareholders, Number of days considered Minimum net tangible assets to complete business combination Minimum Net Tangible Assets To Complete Business Combination Minimum net tangible assets to complete business combination Minimum percentage of aggregate common shares that may not be redeemed without prior consent of the Company. Minimum Percentage Of Aggregate Common Shares That May Not Be Redeemed Without Prior Consent Percentage of aggregate common shares that may not be redeemed without prior consent Percentage of public shares required to be redeemed by the company if business combination is not completed within the specified period. Percentage Of Public Shares Required To Be Redeemed If Business Combination Is Not Completed Within Specified Period Percentage of public shares required to be redeemed if business combination is not completed within specified period Number of business days after which the public shares are required to be redeemed by the company if business combination is not completed within the specified period. Number Of Business Days After Which Public Shares Required To Be Redeemed If Business Combination Is Not Completed Within Specified Period Number of business days after which the public shares are to be redeemed if business combination is not completed within specified period Maximum interest earned on funds held in trust account to be used to pay dissolution expenses. Maximum Interest Earned On Funds Held In Trust Account To Pay Dissolution Expenses Maximum interest earned to be used to pay dissolution expenses Full pro rata interest per share in the trust account receivable by the public shareholders, in the event of liquidation. Full Pro Rata Interest Per Share Receivable By Public Shareholders, In Event Of Liquidation Full pro rata interest per share receivable by the Public Shareholders, in the event of liquidation (in dollars per share) Maximum reduction in amounts held in trust account, per public share, exceeding which will trigger the Sponsor to be liable to the company. Maximum Reduction In Amounts Held In Trust Account Per Public Share Reduction in the amount of funds held in trust account (in dollars per share) Assets Held-in-trust Cash held in trust account Securities held in trust account Amount of current liabilities over current assets. Working Capital Deficit Working capital deficit Line of Credit Facility, Maximum Borrowing Capacity Borrowing Capacity Aggregate principal amount Unrecognized Tax Benefits Unrecognized tax benefits as of the end of the year Unrecognized tax benefits as of the beginning of the year Unrecognized tax benefits Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Unrecognized tax benefits, interest and penalties accrued Income Tax Expense (Benefit) INCOME TAX EXPENSE Income Tax Provision Tax provision Class of Warrant or Right, Number of Securities Called by Each Warrant or Right Number of shares issued for each warrant Number of shares called for by each public warrant (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Total anti-dilutive securities Warrants to purchase ordinary shares excluded from computation of diluted loss per share The portion of adjusted profit or loss for the period, net of income taxes, which is attributable to the parent. Adjusted Net Income (Loss) Adjusted net loss Schedule of information pertaining to initial public offering. Initial Public Offering, Disclosure [Table] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Initial Public Offering, Disclosure [Line Items] Number of common stocks included in each unit. Number of Common Stocks, Per Unit Number of common stocks included in each unit Number of warrants that each unit consists. Number Of Warrants That Each Unit Consists Number of public warrants that each unit consists (in shares) Class of Warrant or Right, Exercise Price of Warrants or Rights Exercise price of warrants Exercise price of warrants (in dollars per share) Schedule of information pertaining to private placement. Private Placement, Disclosure [Table] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Private Placement, Disclosure [Line Items] Short-term Debt, Type [Axis] Short Term Debt Type [Domain] Short-term Debt, Type [Domain]