Convertible Senior Notes Convertible Senior Notes [Member] Convertible Senior Notes Statistical Measurement [Domain] Statistical Measurement [Domain] Other current assets, carried at fair value Other Assets, Current, Fair Value Disclosure Other Assets, Current, Fair Value Disclosure Security systems Security Systems [Member] Security Systems Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] Payment of loan origination fees and debt issuance costs Payments of Financing Costs Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Tabular List, Table Tabular List [Table Text Block] Basic and diluted net loss per share: Earnings Per Share, Basic [Abstract] Payments to Employees Payments to Employees Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Type of Restructuring [Domain] Type of 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Threshold Percentage of Stock Price Trigger Issuance of common stock under employee stock purchase plan, net of shares withheld for participant taxes (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Schedule of Available-For-Sale Securities Reconciliation Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Senior Convertible Notes 2030 Convertible Senior Notes 2030 [Member] Convertible Senior Notes 2030 Other assets Increase (Decrease) in Other Operating Assets Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Ownership percentage, joint venture Ownership Percentage, Joint Venture Ownership Percentage, Joint Venture Options Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Cash and Cash Equivalents Cash and Cash Equivalents [Member] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total shareholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Basis of Presentation and Principles of Consolidation Basis of Presentation and Principles of Consolidation [Policy Text Block] Basis of Presentation and Principles of Consolidation Insider Trading Policies and Procedures [Line Items] Share-based compensation expense Stock-based compensation expense Stock-based compensation Share-Based Payment Arrangement, Expense Schedule of Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Common stock authorized (in shares) Common Stock, Shares Authorized David Benson [Member] David Benson Goodwill and Intangible Assets Disclosure [Abstract] CURRENT ASSETS: Assets, Current [Abstract] TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Number of Options (in thousands) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Concentrations of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Fully committed borrowing capacity Line of Credit Facility Fully Committed Borrowing Capacity Line of Credit Facility Fully Committed Borrowing Capacity LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Cover [Abstract] Cash and cash equivalents and Restricted cash Cash and Cash Equivalents, Fair Value Disclosure Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Debt instrument, convertible, threshold consecutive trading days Debt Instrument, Convertible, Threshold Consecutive Trading Days Maximum Maximum [Member] General and administrative General and Administrative Expense [Member] Exercisable (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Accounting Policies [Abstract] Finite-lived intangible assets Finite-Lived Intangible Assets, Net Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Direct selling costs Direct Selling Costs Selling costs incurred related to homes sold in the relevant period Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Liabilities Liabilities: Liabilities [Abstract] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] LOSS BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Asset-backed Senior Revolving Credit Facilities Asset-Backed Senior Revolving Credit Facility [Member] Asset-Backed Senior Revolving Credit Facility OTHER LIABILITIES Other Liabilities, Noncurrent Market Condition RSUs Market Condition RSUs [Member] Market Condition RSUs Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Goodwill, impairment loss Goodwill, Impairment Loss Statement of Stockholders' Equity [Abstract] Stock-based compensation expense capitalized for internally developed software Share-Based Payment Arrangement, Amount Capitalized Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Outstanding, current Long-Term Debt, Current Maturities Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] COMPREHENSIVE LOSS Comprehensive Income (Loss), Net of Tax, Attributable to Parent Expired (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Name Measure Name Restructuring reserve Restructuring Reserve Schedule of Stock-Based Compensation Expense in the Statements of Operations Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Lease liabilities – current portion Operating Lease, Liability, Current Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Furniture and fixtures Furniture and Fixtures [Member] Award Type [Axis] Award Type [Axis] Net Carrying Amount Long-Term Debt TOTAL ASSETS Assets Assets Zillow Zillow, Inc. [Member] Zillow, Inc. Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol Grant date fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Sale of real estate inventory expected period Debt Instrument Repayments, Sale Of Real Estate Inventory Expected Period Debt Instrument Repayments, Sale Of Real Estate Inventory Expected Period Entity Address, City or Town Entity Address, City or Town CASH FLOWS FROM OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Inventory valuation adjustments Inventory Adjustments Other Segment Reporting, Other Segment Item, Amount REAL ESTATE INVENTORY Inventory Disclosure [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] RSUs Restricted Stock Units (RSUs) [Member] Restricted cash Restricted Cash [Member] Restricted Cash Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Assets, Fair Value Disclosure [Abstract] Assets, Fair Value Disclosure [Abstract] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company CEO make-whole provision CEO Make-Whole Provision CEO Make-Whole Provision Warrants Warrant [Member] Impairment of long-lived assets held-for-use Impairment, Long-Lived Asset, Held-for-Use Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Listed for sale Inventory, Real Estate, Held-for-Sale Term Debt Facility 2021-S3 Term Debt Facility 2021-S3 [Member] Term Debt Facility 2021-S3 Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Unamortized Debt Discount and Issuance Costs Debt Issuance Costs, Net Equity method investments Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Related Party Related Party [Member] Common stock outstanding (in dollars per share) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Chief Executive Officer Chief Executive Officer [Member] Document Information [Table] Document Information [Table] PEO PEO [Member] Employee Severance Employee Severance [Member] DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES: Noncash Investing and Financing Items [Abstract] Shares issued during period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Term Debt Facility 2020-M1 Term Debt Facility 2020-M1 [Member] Term Debt Facility 2020-M1 Accumulated Deficit Retained Earnings [Member] Number of RSUs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Effective Interest Rate Debt Instrument, Interest Rate, Effective Percentage Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Share-Based Payment Arrangement [Abstract] CASH, CASH EQUIVALENTS, AND RESTRICTED CASH – Beginning of period CASH, CASH EQUIVALENTS, AND RESTRICTED CASH – End of period Cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Multiple Term Loan Facilities Multiple Term Loan Facilities [Member] Multiple Term Loan Facilities INCOME TAX EXPENSE Income tax provision Income Tax Expense (Benefit) Other Other Assets Interest payable Increase (Decrease) in Interest Payable, Net Document Information [Line Items] Document Information [Line Items] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Schedule of Impairment Loss Recognized Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block] Property, plant and equipment Property, Plant and Equipment, Gross Contractual interest Interest Expense, Debt, Excluding Amortization Issuance Costs Debt Issuance Costs, Current, Net Aggregate purchase price for homes Recorded Unconditional Purchase Obligation Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Liabilities measured at fair value on a recurring basis Liabilities, Fair Value Disclosure Organization, Consolidation and Presentation of Financial Statements [Abstract] RESTRUCTURING Restructuring and Related Activities Disclosure [Text Block] Amortization of right of use asset Operating Lease, Right-of-Use Asset, Periodic Reduction Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Goodwill additions Goodwill, Acquired During Period Description of Business Business Description [Policy Text Block] Business Description City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Repurchase price Debt Instrument, Redemption Price, Percentage Common stock, $0.0001 par value per share Common stock, $0.0001 par value per share [Member] Common stock, $0.0001 par value per share Beginning balance (in shares) Ending balance (in shares) RSU unvested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Class of Warrant or Right [Line Items] Class of Warrant or Right [Line Items] Proceeds from non-recourse asset-backed debt Proceeds from Long-Term Lines of Credit CASH FLOWS FROM INVESTING ACTIVITIES: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative General and Administrative Expense Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Term Debt Instrument, Term Related Party Transactions [Abstract] Common Stock Warrants Common Stock Warrants [Member] Common Stock Warrants Other Other Liabilities GOODWILL Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Money market funds Money Market Funds [Member] Denominator: Weighted Average Number of Shares Outstanding, Basic [Abstract] Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Convertible Debt Convertible Debt [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Total cost basis Cash, Cash Equivalents And Marketable Securities, Amortized Cost Cash, Cash Equivalents And Marketable Securities, Amortized Cost Number of reportable segments Number of Reportable Segments Expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period RECONCILIATION TO CONDENSED CONSOLIDATED BALANCE SHEETS: Supplemental Cash Flow Information [Abstract] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] VARIABLE INTEREST ENTITIES Variable Interest Entity Disclosure [Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Number of shares authorized to be purchased by warrant agreement (in shares) Class Of Warrant Or Right, Number Of Securities Called By Warrants Or Rights, Authorized Class Of Warrant Or Right, Number Of Securities Called By Warrants Or Rights, Authorized Weighted- Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Entity Address, State or Province Entity Address, State or Province Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Dividends declared or paid Dividends, Common Stock Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Significant Risks and Uncertainties Significant Risks and Uncertainties [Policy Text Block] Significant Risks and Uncertainties Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Liabilities, Current Individual: Individual [Axis] Restricted cash Restricted Cash Other current assets ($1 and $0 carried at fair value) Other current assets Other Assets, Current Technology and development Research and Development Expense [Member] Net cash (used in) provided by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION – Cash paid during the period for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus RIGHT OF USE ASSETS Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Carrying Value Reported Value Measurement [Member] Unamortized stock-based compensation period (in years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Exercise of stock options (in shares) Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period SHAREHOLDERS’ EQUITY: Equity [Abstract] Operations Variable Operations Expense Variable Operations Expense Multiple Senior Revolving Credit Facilities Multiple Senior Revolving Credit Facilities [Member] Multiple Senior Revolving Credit Facilities Exercisable, aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Other current assets: Other Assets, Current [Abstract] Other Assets, Current Issuance of common stock for settlement of RSUs, net of shares withheld for participant taxes (in shares) Stock Issued During Period, Shares, Settlement Of Restricted Stock Units, Net Of Shares Withheld For Taxes Stock Issued During Period, Shares, Settlement Of Restricted Stock Units, Net Of Shares Withheld For Taxes Restricted assets Other Restricted Assets SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Class of Warrant or Right [Table] Class of Warrant or Right [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Amortization expense of intangible assets Amortization of Intangible Assets Mortgage loans held for sale Loan, Mortgage, Held-for-Sale, Fair Value Disclosure Restricted cash Restricted cash Restricted Cash and Cash Equivalent, Current Depreciation and amortization expense Depreciation, Depletion and Amortization OTHER ASSETS Other Assets, Noncurrent Conversion Rate Debt Instrument, Convertible, Conversion Ratio Interest payable Interest Payable, Current Entity Central Index Key Entity Central Index Key PEO Name PEO Name Conversion price (in dollars per share) Debt Instrument, Convertible, Conversion Price Withdrawal period Debt Instrument, Term, Withdrawal Period, Maximum Debt Instrument, Term, Withdrawal Period, Maximum m Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving Credit Facility Revolving Credit Facility [Member] Finished goods: Finished Goods [Abstract] Finished Goods Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Computers Computer Equipment [Member] Certain Employees, Excluding Management Certain Employees, Excluding Management [Member] Certain Employees, Excluding Management Segments [Axis] Segments [Axis] Exercise price of warrants (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Exercise Price Award Exercise Price Non-marketable security, unrealized losses Non-Marketable Security, Unrealized Gain (Loss) Non-Marketable Security, Unrealized Gain (Loss) Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Other Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item SHARE-BASED AWARDS Share-Based Payment Arrangement [Text Block] Number of homes under contract to be purchased Recorded Unconditional Purchase Obligation, Minimum Quantity Required Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] ASSETS Assets Assets: Assets [Abstract] Net Carrying Amount Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] Series Z Warrants, each whole warrant exercisable to purchase one share of common stock at an exercise price of $17.00 per warrant Series Z Warrants, each whole warrant exercisable to purchase one share of common stock at an exercise price of $17.00 per warrant [Member] Series Z Warrants, each whole warrant exercisable to purchase one share of common stock at an exercise price of $17.00 per warrant Underlying Security Market Price Change Underlying Security Market Price Change, Percent Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value FAIR VALUE DISCLOSURES Fair Value Disclosures [Text Block] LOSS ON EXTINGUISHMENT OF DEBT Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Credit Facility [Domain] Credit Facility [Domain] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Technology and development Research and Development Expense Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Investment, Name [Axis] Investment, Name [Axis] Stated cash interest rate Stated Cash Interest Rate Debt Instrument, Interest Rate, Stated Percentage LEASE LIABILITIES – Net of current portion Operating Lease, Liability, Noncurrent Total Equity Method Investments And Equity Securities Without Readily Determinable Fair Value Equity Method Investments And Equity Securities Without Readily Determinable Fair Value Depreciation and amortization  Depreciation, Amortization and Accretion, Net Fair Value as of Grant Date Award Grant Date Fair Value Property, Plant and Equipment [Abstract] Entity Registrant Name Entity Registrant Name Outstanding amount, current Long-Term Debt, Gross, Current Long-Term Debt, Gross, Current Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Schedule of Credit Facilities and Long Term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Impairment, long-lived asset, held-for-use, statement of income or comprehensive income [Extensible Enumeration] Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] Title and Position [Domain] Title and Position [Domain] Convertible senior notes – current portion Convertible Debt, Current Unamortized stock-based compensation Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Related Party Transaction [Line Items] Related Party Transaction [Line Items] Document Quarterly Report Document Quarterly Report Assets measured at fair value on a recurring basis Total assets Assets, Fair Value Disclosure Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Warrants issued (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted Counterparty Name [Domain] Counterparty Name [Domain] Non-marketable equity securities Equity Securities without Readily Determinable Fair Value, Amount Number of operating segments Number of Operating Segments Excluding Market Condition RSUs Excluding Market Condition RSUs [Member] Excluding Market Condition RSUs Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Weighted-average remaining contractual term (in years), outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Related Party [Axis] Related and Nonrelated Parties [Axis] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Principal payments on non-recourse asset-backed debt Repayments of Long-Term Lines of Credit Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] Aggregate intrinsic values Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Issuance of common stock under employee stock purchase plan, net of shares withheld for participant taxes Stock Issued During Period, Value, Employee Stock Purchase Plan Mainstay Labs, Inc. Mainstay Labs, Inc. [Member] Mainstay Labs, Inc. Total Convertible Senior Notes interest expense Interest Expense, Debt Origination of mortgage loans held for sale Payment for Origination and Purchase, Loan, Held-for-Sale Name Trading Arrangement, Individual Name Award Type [Domain] Award Type [Domain] Asset-backed Senior Term Debt Facilities Asset-Backed Senior Term Debt Facility [Member] Asset-Backed Senior Term Debt Facility Statement of Other Comprehensive Income [Abstract] Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Restructuring Type [Axis] Restructuring Type [Axis] Escrow receivable Escrow Deposit Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Employee Stock Purchase Plan Employee Stock [Member] Outstanding amount, current Long Term Debt, Gross, Current And Short Term Debt Long Term Debt, Gross, Current And Short Term Debt Real estate inventory Increase (Decrease) in Loan, Mortgage, Held-for-Sale Mainstay National Title LLC Mainstay National Title LLC [Member] Mainstay National Title LLC Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Series K Warrants, each whole warrant exercisable to purchase one share of common stock at an exercise price of $9.00 per warrant Series K Warrants, each whole warrant exercisable to purchase one share of common stock at an exercise price of $9.00 per warrant [Member] Series K Warrants, each whole warrant exercisable to purchase one share of common stock at an exercise price of $9.00 per warrant Total fair value Cash, Cash Equivalents And Marketable Securities Cash, Cash Equivalents And Marketable Securities Sales, marketing and operations Selling and Marketing Expense Schedule of Equity Method Investments and Non-Marketable Equity Securities Schedule Of Non-Marketable Equity Securities And Equity Method Investments [Table Text Block] Schedule Of Non-Marketable Equity Securities And Equity Method Investments Segments [Domain] Segments [Domain] Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Schedule of Cash and Cash Equivalents [Table] Cash and Cash Equivalent [Table] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Carrying Value Long Term Debt, Current Maturities And Short Term Debt Long Term Debt, Current Maturities And Short Term Debt Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Non-recourse asset-backed debt – current portion Line of Credit, Current Amortization of debt discount and issuance costs Amortization of Debt Issuance Costs and Discounts Warrants to purchase shares (in shares) Class of Warrant or Right, Number of Securities Called by Warrants or Rights Minimum Minimum [Member] Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] CREDIT FACILITIES, LONG-TERM DEBT, AND CONVERTIBLE NOTES Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Proceeds from issuance of common stock for ESPP Proceeds from Stock Plans Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Net loss – diluted Net Income (Loss) Available to Common Stockholders, Diluted All Executive Categories All Executive Categories [Member] Common stock, $0.0001 par value; 3,000,000,000 shares authorized; 963,283,777 and 957,245,487 shares issued, respectively; 963,283,777 and 957,245,487 shares outstanding, respectively Common Stock, Value, Issued Schedule of Convertible Senior Notes Convertible Debt [Table Text Block] Escrow receivable Increase (Decrease) In Escrow Receivable Increase (Decrease) In Escrow Receivable Fixed operating expense Fixed Operating Expense Fixed Operating Expense COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Title and Position [Axis] Title and Position [Axis] Diluted (in shares) Weighted average shares outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted COMMITMENTS AND CONTINGENCIES (See Note 15) Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Real estate inventory, net Total real estate inventory Real estate inventory, net Inventory, Real Estate Entity Small Business Entity Small Business Sales, marketing and operations Selling and Marketing Expense [Member] Income Tax Disclosure [Abstract] Revolving Facility 2018-3 Revolving Facility 2018-3 [Member] Revolving Facility 2018-3 Under contract for sale Inventory, Real Estate, In Resale Contract Inventory, Real Estate, In Resale Contract Document Transition Report Document Transition Report Schedule of Fair Value Disclosure of Asset and Liability Not Measured at Fair Value Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table Text Block] Numerator: Net Income 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