Document And Entity Information Entity Addresses [Table] Entity Addresses, Address Type [Axis] Address Type [Domain] Business Contact [Member] Business Contact Class of Stock [Axis] Class of Stock [Domain] Common Class A [Member] Class A Ordinary Shares Common Class B [Member] Class B Ordinary Shares Entity Addresses Document Type Document Registration Statement Document Annual Report Document Period End Date Document Transition Report Document Shell Company Report Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Contact Personnel Name Contact Personnel Email Address Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Three Entity Address, City or Town Entity Address, Postal Zip Code Entity Address, Country City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Emerging Growth Company ICFR Auditor Attestation Flag Document Financial Statement Error Correction [Flag] Document Accounting Standard Entity Shell Company Auditor Name Auditor Firm ID Auditor Location Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag CONSOLIDATED BALANCE SHEETS Statement [Table] Series D convertible preferred shares Series D convertible preferred shares Series F convertible preferred shares Series F convertible preferred shares Series G Preferred Stock [Member] Series G convertible preferred shares Series H Preferred Stock [Member] Series H convertible preferred shares Statement [Line Items] Statement Assets ASSETS Assets, Current [Abstract] CURRENT ASSETS: Cash Cash and cash equivalents Inventory, Net Inventories Prepaid Expense and Other Assets, Current Prepayment for vehicle purchase and other current assets, net Assets, Current TOTAL CURRENT ASSETS Long-Term Investments Long-term investment Property, Plant and Equipment, Net Property and equipment, net Goodwill. Goodwill Finite-Lived Intangible Assets, Net Intangible assets, net Intangible assets, net Operating Lease, Right-of-Use Asset Right-of-use assets Operating lease right-of-use assets Assets, Noncurrent TOTAL NON-CURRENT ASSETS Assets [Default Label] TOTAL ASSETS Liabilities and Shareholders' Equity LIABILITIES AND EQUITY LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities, Current [Abstract] CURRENT LIABILITIES: Operating Lease, Liability, Current Short-term operating lease liabilities Contract with Customer, Liability, Current Contract liabilities Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. Convertible notes current Convertible notes Accrued Income Taxes, Current Income tax payable Accounts payable and accrued expenses Amounts due to related parties Warrant Liability Warrant liability Warrant liabilities Accrued Liabilities and Other Liabilities Accrued expenses and other current liabilities Total Accrued expenses and other current liabilities Liabilities, Current Current liabilities TOTAL CURRENT LIABILITIES Operating Lease, Liability, Noncurrent Lease liabilities non-current Long-term operating lease liabilities Deferred Income Tax Liabilities, Net Deferred tax liabilities Liabilities TOTAL LIABILITIES Commitments. COMMITMENT AND CONTINGENCIES Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] EQUITY Shareholders' equity Common Stock, Value, Issued Ordinary shares Preferred Stock, Value, Issued Preferred Stock, Value, Issued Additional Paid in Capital Additional paid-in capital Additional paid-in capital Note received instead of cash as contribution to equity. The transaction may be a sale of capital stock or a contribution to paid-in capital. Subscriptions Receivable Subscription receivable Statutory Accounting Practices, Statutory Capital and Surplus, Balance Statutory reserve Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Stockholders' Equity Attributable to Parent TOTAL KAIXIN HOLDINGS' SHAREHOLDERS' EQUITY Stockholders' Equity Attributable to Noncontrolling Interest Non-controlling interests Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance at ending Balance at beginning TOTAL EQUITY Liabilities and Equity TOTAL LIABILITIES AND EQUITY Represents the information pertaining to Series I preferred stock Series I Preferred Stock [Member] Series I convertible preferred shares Common Stock, Par or Stated Value Per Share Ordinary shares, par value (in dollars per share) Common Stock, Shares Authorized Ordinary shares, authorized Common Stock, Shares, Issued Ordinary shares, issued Common Stock, Shares, Outstanding Ordinary shares outstanding Preferred Stock, Par or Stated Value Per Share Preferred shares, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred shares, authorized Preferred Stock, Shares Issued Preferred shares, issued Preferred Stock, Shares Outstanding Preferred shares, outstanding Stockholders' Equity Note, Stock Split, Conversion Ratio Share consolidation ratio The value of common stock authorized as on date. Common Stock, Authorized Share Capital Common stock, authorized share capital CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Revenue from Contract with Customer, Excluding Assessed Tax Revenue, net Cost of Revenue Cost of revenues Gross Profit Gross Profit Selling and Marketing Expense Selling and marketing expenses General and Administrative Expense General and administrative expenses Operating Expenses Total Operating Expenses Operating Income (Loss) Loss from Operations Other Nonoperating Income (Expense) Other income (expenses), net Foreign Currency Transaction Gain (Loss), before Tax Foreign currency exchange gain (loss) Interest Expense Interest expense, net Gain (Loss) on Disposition of Stock in Subsidiary Loss (gain) on disposal of subsidiaries (Loss) gain on disposal of subsidiaries Fair Value Adjustment of Warrants Change in fair value of warrants Fair value change of warrants Income (Loss) from Equity Method Investments Share of equity loss Less: share of equity loss Share of equity loss Impairment of Intangible Assets, Finite-Lived Impairment of intangible assets Impairment of intangible assets The amount of impairment of other receivables. Impairment of Other Receivables Impairment of other receivables Impairment of other receivables The amount of impairment of prepaid expenses and other current assets. Impairment of Prepaid Expenses and Other Current Assets Impairment of prepaid expenses and other current assets Impairment of prepaid expenses and other current assets Nonoperating Income (Expense) Other expenses, net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Net loss before provision for income taxes Loss Before Income Tax Income Tax Expense (Benefit) Income tax benefits Total income tax benefit Income tax expenses Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Net Loss Net Loss Net loss Net Income (Loss) Attributable to Noncontrolling Interest Less: net (loss) income attributable to non-controlling interests Net Loss Attributable to Kaixin's Shareholders Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Other Comprehensive Income (Loss) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation adjustment Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Loss Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Less: comprehensive loss attributable to non-controlling interest Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive Loss Attributable to Kaixin's Shareholders LOSS PER SHARE Loss Per Share Earnings Per Share, Basic Loss Per Share, basic Loss Per Share - Basic Earnings Per Share, Diluted Loss Per Share, diluted Loss Per Share - diluted Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Weighted Average Shares Used in Calculating Net Loss Per Share Weighted Average Number of Shares Outstanding, Basic Weighted Average Shares Used in Calculating Net Loss Per Share - Basic Weighted Average Shares Used in Calculating Net Loss Per Share, basic Weighted Average Number of Shares Outstanding, Diluted Weighted Average Shares Used in Calculating Net Loss Per Share - diluted Weighted Average Shares Used in Calculating Net Loss Per Share, diluted CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Equity Components [Axis] Equity Component [Domain] Ordinary shares Common Stock Preferred shares Preferred shares Additional paid-in capital Additional paid-in capital Represents the information pertaining to note received instead of cash as contribution to equity. The transaction may be a sale of capital stock or a contribution to paid-in capital. Subscriptions Receivable [Member] Subscription receivable Represents the statutory reserves. Statutory reserves Statutory reserve Accumulated earnings (deficit) Accumulated deficit Accumulated Other Comprehensive (loss) income Accumulated Other Comprehensive (loss) income Total shareholders' equity Total shareholders' equity Non-controlling interest Non-controlling interest Increase (Decrease) in Stockholders' Equity [Roll Forward] STATEMENTS OF CHANGES IN EQUITY Shares, Outstanding Balance at ending (in shares) Balance at beginning (in shares) Stock Issued During Period, Value, Restricted Stock Award, Gross Vesting of restricted shares award Stock Issued During Period, Shares, Restricted Stock Award, Gross Vesting of restricted shares award (in shares) The amount of issuance of ordinary shares and warrant for private placement. Issuance of Ordinary Shares and Warrant for Private Placement Value Issuance of ordinary shares and warrant for private placement Number of shares issuance of ordinary shares and warrant for private placement. Issuance of Ordinary Shares and Warrant for Private Placement Shares Issuance of ordinary shares and warrant for private placement (in shares) Reclassification of ordinary shares subject to possible conversion Issuance of ordinary shares for conversion of Series F convertible preferred shares Reclassification of ordinary shares subject to possible conversion (in shares) Issuance of ordinary shares for conversion of Series F convertible preferred shares (shares) Series A preferred shares conversion (shares) Value of stock issued pursuant to compensation of negative net assets. Stock Issued During Period, Compensation Of Negative Net Assets, Value Issuance of ordinary shares to the buyer of Morning Star (Note 3) Number of shares of stock issued during the period pursuant to compensation of negative net assets. Stock Issued During Period, Compensation Of Negative Net Assets, Shares Convertible preferred shares Issuance of ordinary shares to the buyer of Morning Star (Note 3) (in shares) Value of stock issued on redemption of warrants. Stock Issued During Period, Value, redemption of Warrants Issuance of ordinary shares for conversion of convertible preferred shares The number of shares issued during the period upon redemption of warrants. Stock Issued During Period, Shares, Redemption of Warrants Issuance of ordinary shares for conversion of convertible preferred shares (in shares) Value of stock issued pursuant to dispositions during the period. Stock Issued During Period, Value, Dispositions Issuance of Series G convertible preferred shares to settle payables due to purchaser of KAG Dispositions of value Number of shares of stock issued during the period pursuant to dispositions. Stock Issued During Period, Shares, Dispositions Issuance of Series G convertible preferred shares to settle payables due to purchaser of KAG (Shares) Dispositions of shares issued Value of stock issued pursuant to settlement of payables for sales incentive during the period. Stock Issued During Period, Value, Settlement of Payables for Sales Incentive Issuance of Series H convertible preferred shares to settle payables for sales incentive Number of shares of stock issued during the period pursuant to settlement of payables for sales incentive. Stock Issued During Period, Shares, Settlement of Payables for Sales Incentive Issuance of Series H convertible preferred shares to settle payables for sales incentive (Shares) Common Stock Dividends, Shares Issuance of ordinary shares for payments of dividends (shares) Noncontrolling Interest, Change in Redemption Value Disposal of subsidiaries Stock Issued During Period, Value, Acquisitions Share based consideration on acquisition of a subsidiary Stock Issued During Period, Shares, Acquisitions Issuance of shares through private placement Share based consideration on acquisition of a subsidiary (shares) Value of stock issued to settle payables for sales incentive. Stock Issued During Period, Value, Settle Payables For Sales Incentive Issuance of shares to settle payables for sales incentive The number of shares issued during the period to settle payables for sales incentive. Stock Issued During Period, Shares, Settle Payables For Sales Incentive Issuance of shares to settle payables for sales incentive (shares) Value of stock issued on conversion of convertible debt. Stock Issued During Period, Value, Conversion of Convertible Debt Issuance of ordinary shares for conversion of convertible notes The number of shares issued during the period upon conversion of convertible debt. Stock Issued During Period, Shares, Conversion of Convertible Debt Stock issued during period, shares, conversion of convertible debt Issuance of ordinary shares for conversion of convertible notes (shares) CONSOLIDATED STATEMENTS OF CASH FLOWS Cash Flows from Operating Activities: CASH FLOWS FROM OPERATING ACTIVITIES: Adjustments to reconcile net income to net cash used in operating activities: Adjustments to reconcile net loss to net cash used in operating activities Depreciation, Depletion and Amortization Depreciation and amortization Share-based Payment Arrangement, Noncash Expense Share-based compensation Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. Foreign Currency Transaction Gain (Losses), before Tax Foreign currency exchange gain Operating Lease, Right-of-Use Asset, Periodic Reduction Amortization of right-of-use assets Amount of provisions for dealership settlement. Provisions For Dealership Settlement Provision for dealership settlement Sales Commissions and Fees Provision for sales incentive The amount of financial expenses. Financial Expenses Financial expenses Amount of interest expense from convertibles. Interest Expense From Convertible Interest expenses of convertible note in interest method Deferred Income Taxes and Tax Credits Deferred tax liabilities Changes in current assets and current liabilities: Changes in operating assets and liabilities: Increase (Decrease) in Inventories Inventories Increase (Decrease) in Prepaid Expense and Other Assets Prepayment for vehicle purchase and other current assets Increase (Decrease) in Accounts Payable, Related Parties Amount due from related parties Increase (Decrease) in Other Noncurrent Assets Other non-current assets Increase (Decrease) in Accounts Payable, Trade Accounts payable Increase (Decrease) in Contract with Customer, Liability Advances from customers