Document and Entity Information Statement [Table] Statement [Line Items] Class Of Stock Income Taxes Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus CONSOLIDATED BALANCE SHEETS Class of Stock [Axis] Class Of Stock [Domain] Class of Stock [Domain] Represents the information pertaining to series A1 convertible preferred shares. Series A1 Convertible Preferred Shares [Member] Series A1 convertible preferred shares Represents the information pertaining to series A2 convertible preferred shares. Series A2 Convertible Preferred Shares [Member] Series A2 convertible preferred shares Represents the information pertaining to series B1 convertible preferred shares. Series B1 Convertible Preferred Shares [Member] Series B1 convertible preferred shares Represents the information pertaining to series B2 convertible preferred shares. Series B2 Convertible Preferred Shares [Member] Series B2 convertible preferred shares Represents the information pertaining to series B3 convertible preferred shares. Series B3 Convertible Preferred Shares [Member] Series B3 convertible preferred shares Represents the information pertaining to Series B4 Convertible Preferred Shares. Series B4 Convertible Preferred Shares [Member] Series B4 Convertible Preferred Shares Represents the information pertaining to series C1 convertible preferred shares. Series C1 Convertible Preferred Shares [Member] Series C1 convertible preferred shares Represents the information pertaining to C2 Convertible Preferred Shares. Series C2 Convertible Preferred Shares [Member] C2 Convertible Preferred Shares Represents the information pertaining to series C3 convertible preferred shares. Series C3 Convertible Preferred Shares [Member] Series C3 convertible preferred shares Common Class A [Member] Class A ordinary shares Common Class B [Member] Class B ordinary shares ASSETS Assets, Current [Abstract] Current assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and cash equivalents Restricted Cash, Current Restricted cash Amount due from online payment platforms, within one year of the balance sheet date (or the normal operating cycle, whichever is longer). Receivables From Online Payment Platforms, Current Receivables from online payment Platforms Receivables from online payment platforms Short-term Investments. Short-term investments Due from Related Parties, Current Amounts due from related parties Prepaid Expense and Other Assets, Current Prepayments and other current assets Total Assets, Current Total current assets Other Non-Current Asset Non-current assets Property, Plant and Equipment, Net Property and Equipment, Net Property and equipment, net Intangible Assets, Net (Excluding Goodwill) Intangible asset Notes Receivable, Related Parties, Noncurrent Loan to a related party Loan to a related party Non-current Equity Method Investments Investments in subsidiaries, the VIE and a subsidiary of the VIE Other Assets, Noncurrent Total advance Other non-current assets Assets, Noncurrent Total non-current assets Assets. Total Assets Liabilities and Equity [Abstract] LIABILITIES, MEZZANINE EQUITY AND SHAREHOLDERS' DEFICITS LIABILITIES, MEZZANINE EQUITY AND SHAREHOLDERS' (DEFICITS)/EQUITY Liabilities, Current [Abstract] Current liabilities Due to Related Parties, Current Amounts due to related parties Amounts due to related parties (including amounts due to related parties of the consolidated VIE and its subsidiaries without recourse to the primary beneficiary of RMB56,032 and RMB458,147 (US$66,635) as of December 31, 2017 and 2018, respectively) Carrying amount as of the balance sheet date of service fees received from merchants in advance of the provision of online marketplace services. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer). Advances To Customer, Current Customer advances (including customer advances of the consolidated VIE and its subsidiaries without recourse to the primary beneficiary of RMB56,453 and RMB190,382 (US$27,690) as of December 31, 2017 and 2018, respectively) Customer advances Amount of payable to merchants in connection with the provision of online marketplace services. Payable To Merchants, Current Payable to merchants (including payable to merchants of the consolidated VIE and its subsidiaries without recourse to the primary beneficiary of RMB9,838,519 and RMB17,275,934 (US$2,512,680) as of December 31, 2017 and 2018, respectively) Payable to merchants Accounts Payable and Accrued Liabilities, Current Accrued expenses and other liabilities Total Accrued expenses and other liabilities (including accrued expenses and other liabilities of the consolidated VIE and its subsidiaries without recourse to the primary beneficiary of RMB208,301 and RMB1,500,951 (US$218,304) as of December 31, 2017 and 2018, respectively) Deposit Liability, Current Merchant deposits Merchant deposits (including merchant deposits of the consolidated VIE and its subsidiaries without recourse to the primary beneficiary of RMB1,778,085 and RMB4,188,273 (US$609,159) as of December 31, 2017 and 2018, respectively) Liabilities, Current Total current liabilities Liabilities Total liabilities Temporary Equity [Abstract] Mezzanine equity Temporary Equity, Carrying Amount, Attributable to Parent Mezzanine equity Stockholders' Equity Attributable to Parent [Abstract] Shareholders' deficits Shareholders' (deficits)/equity Common Stock, Value, Issued Common Shares Additional Paid in Capital Additional paid-in capital Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive (loss)/income Retained Earnings (Accumulated Deficit) Accumulated deficits Stockholders' Equity Attributable to Parent Balance at end of the year Balance at beginning of the year Total shareholders' (deficits)/equity Liabilities and Equity Total liabilities, mezzanine equity and shareholders' (deficits)/equity Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Variable Interest Entity Primary Beneficiary [Member] Consolidated VIE Temporary Equity, Par or Stated Value Per Share Convertible preferred shares, par value Temporary Equity, Shares Authorized Convertible preferred shares, shares authorized Temporary Equity, Shares Issued Convertible preferred shares, issued Temporary Equity, Shares Outstanding Convertible preferred shares, outstanding Temporary Equity, Shares Subscribed but Unissued, Subscriptions Receivable Convertible preferred shares, subscription receivable Common Stock, Par or Stated Value Per Share Ordinary shares, par value Common Stock, Shares Authorized Ordinary shares, shares authorized Common Stock, Shares, Issued Shares issued Common Stock, Shares, Outstanding Balance (in shares) Balance (in shares) Ordinary shares, outstanding CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS Product and Service [Axis] Products And Services [Domain] Product and Service [Domain] Represents information pertaining to online merchandise sales of fresh produce and other perishable products, it is primarily obligated for the merchandise sold to the customers, subject to inventory risk, has latitude in establishing prices and selecting suppliers. Merchandise Sales [Member] Merchandise sales Revenues [Abstract] Revenues Revenue from Contract with Customer, Excluding Assessed Tax Revenues Net revenues Cost of Revenue [Abstract] Costs of revenues Cost of Revenue Total costs of revenues Total costs Gross Profit Gross (loss)/profit Selling and Marketing Expense Sales and marketing expenses General and Administrative Expense General and administrative expenses Research and Development Expense Research and development expenses Other than Temporary Impairment Losses, Investments Impairment of a long-term investment Impairment of long-term investment Impairment charge Operating Expenses Total operating expenses Operating Income (Loss) Operating loss Operating loss Investment Income, Interest Interest income Foreign Currency Transaction Gain (Loss), before Tax Foreign exchange gain/(loss) Income (Loss) from Equity Method Investments Share of losses from subsidiary, the VIE and subsidiary of the VIE Fair Value Adjustment of Warrants Changes in the fair value of warrant liability Change in the fair value of warrant liability Other Nonoperating Income (Expense) Other (loss)/income, net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Loss before income tax expenses Loss before income tax Income Tax Expense (Benefit) Income tax expenses Income tax expenses Net Income (Loss) Attributable to Parent Net loss Net loss Amount of deemed distribution to certain holders of convertible preferred shares. Deemed Distribution To Certain Holders Of Convertible Preferred Shares Deemed distribution to certain holders of convertible preferred shares Deemed distribution to certain holders of Convertible Preferred Shares Increase to fair value of modified Convertible Preferred Shares as deemed dividends The amount of contribution from a holder of convertible preferred shares. Contribution From Holder Of Convertible Preferred Shares Contribution from a holder of convertible preferred shares Excess of the issuance price paid by investor over fair value encounter as contribution from shareholder Net Income (Loss) Available to Common Stockholders, Basic Net loss attributable to ordinary shareholders Loss Per Share Loss per share: Earnings Per Share, Basic Basic Earnings Per Share, Diluted Diluted Weighted Average Number of Shares Outstanding, Diluted [Abstract] Shares used in loss per share computation Denominator: Weighted Average Number of Shares Outstanding, Basic Basic Weighted Average Number of Shares Outstanding, Diluted Diluted Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive income/(loss), net of tax of nil Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Foreign currency translation difference, net of tax of nil Foreign currency translation difference Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Other comprehensive income/(loss), tax Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent Foreign currency translation difference, tax CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' (DEFICITS)/EQUITY Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Ordinary shares Additional Paid In Capital [Member] Additional paid in capital Accumulated Other Comprehensive Income [Member] Accumulated other comprehensive (loss)/income Retained Earnings [Member] Accumulated Deficits Increase (Decrease) in Stockholders' Equity [Roll Forward] Changes in equity The amount represents the effect of accumulated deficits deemed distribution to certain holders of convertible preferred shares. Effect of Deemed Distribution to Certain Holders of Convertible Preferred Shares on Accumulated Deficits Deemed distribution to certain holders of convertible preferred shares The amount of conversion of convertible preferred shares to ordinary shares. Adjustments To Additional Paid In Capital Conversion Of Convertible Preferred Shares To Ordinary Shares Conversion of convertible preferred shares to ordinary shares The number of shares, conversion of convertible preferred shares to ordinary shares. Shares Conversion Of Convertible Preferred Shares To Ordinary Shares Conversion of convertible preferred shares to ordinary shares (in shares) Stock Issued During Period, Value, New Issues Initial public offering Stock Issued During Period, Shares, New Issues Initial public offering (in shares) Number of ordinary shares issued Stock Repurchased and Retired During Period, Value Repurchase and cancellation of Class B ordinary shares Stock Repurchased and Retired During Period, Shares Repurchase and cancellation of Class B ordinary shares (in shares) Repurchased and cancellation of Class B ordinary shares The amount of adjustments to additional paid in capital by contribution from holder of convertible preferred shares . Adjustments to Additional Paid In Capital Contribution from Holder of Convertible Preferred Shares Contribution from a holder of convertible preferred shares Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Share-based compensation Stock Issued During Period, Shares, Share-based Compensation, Gross Share-based compensation (in shares) Shares issued CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities [Abstract] CASH FLOW FROM OPERATING ACTIVITIES Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization Interest Income, Operating Interest income Gain (Loss) on Disposition of Property Plant Equipment Loss on disposal of property and equipment Share-based Compensation. Share-based compensation Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Receivables Receivables from online payment platforms Increase (Decrease) in Due from Related Parties Amounts due from related parties Increase (Decrease) in Prepaid Expense and Other Assets Prepayments and other current assets Increase (Decrease) in Due to Related Parties Amounts due to related parties Amount of increase (decrease) in customer advances. Increase (Decrease) in Advances to Customers Customer advances Amount of increase (decrease) in payables to merchants. Increase (Decrease) in Payables to Merchants Payables to merchants Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Accrued expenses and other liabilities Amount of increase (decrease) in merchant deposits. Increase (Decrease) in Merchant Deposits Merchant deposits Net Cash Provided by (Used in) Operating Activities Net cash flow generated from operating activities Net cash flow generated from operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] CASH FLOW FROM INVESTING ACTIVITIES Cash flows from investing activities: Payments to Acquire Short-term Investments Purchase of short-term investments Cash given to purchase of short term investment Proceeds from Sale of Short-term Investments Proceeds from sales of short-term investments Payments to Acquire Long-term Investments Purchase of long-term investments Proceeds from Sale of Long-term Investments Proceeds from disposal of a long-term investment Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment Proceeds from Sale of Property, Plant, and Equipment Proceeds from disposal of property and equipment Payments to Fund Long-term Loans to Related Parties Loan to a related party Proceeds from Collection of Long-term Loans to Related Parties Repayment from a related party Payments for (Proceeds from) Loans Receivable Loans to third parties, net of repayment Net Cash Provided by (Used in) Investing Activities Net cash (used in)/generated from investing activities Net cash flow (used in) / generated from investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] CASH FLOW FROM FINANCING ACTIVITIES Cash flows from financing activities: Amount of deemed distribution. Payments Of Deemed Distribution Deemed distribution Deemed distribution Proceeds from Issuance Initial Public Offering Proceeds from initial public offering The cash outflow for cost incurred directly with the issuance of the entity's first offering of stock to the public. Payments of Issuance Initial Public Offering Costs Initial public offering costs Proceeds from Issuance of Convertible Preferred Stock Proceeds from issuance of convertible preferred shares Proceeds from issuance of Convertible Preferred Shares Payments for Repurchase of Redeemable Convertible Preferred Stock Costs incurred for the issuance of convertible preferred shares Payments for Repurchase of Common Stock Repurchase of Class B ordinary shares Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Net cash flow generated from financing activities Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Exchange rate effect on cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net increase in cash, cash equivalents and restricted cash Net increase in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of year Cash, cash equivalents and restricted cash at beginning of year Total cash, cash equivalents and restricted cash in the statements of cash flows Supplemental Cash Flow Information [Abstract] Supplement disclosure of cash flow information: Interest Income (Expense), Net Interest received Noncash Investing and Financing Items [Abstract] Supplement disclosure of non-cash investing activities: Capital Expenditures Incurred but Not yet Paid Purchase of property and equipment included in accrued expenses and other liabilities The amount of Purchase of property and equipment included in prepayments, other receivables and other current assets. Purchase Of Property And Equipment Included In Prepayments, Other Receivables And Other Current Assets Purchase of property and equipment included in prepayments, other receivables and other current assets Noncash or Part Noncash Acquisition, Intangible Assets Acquired Acquisition of intangible asset Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Reconciliation of cash, cash equivalents and restricted cash: Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Organization Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Concentration of Risks Concentration Risk Disclosure [Text Block] Concentration of Risks Short-term Investments The entire disclosure for short-term investments. Short-term Investments [Text Block] Short-term Investments Prepayments and Other Current Assets The entire disclosure for prepayments and other current assets. Prepayments and Other Assets, Current [Text Block] Prepayments and Other Current Assets Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Property and Equipment, Net Intangible Asset Intangible Assets Disclosure [Text Block] Intangible asset Accrued Expenses and Other Liabilities The entire disclosure for accrued expenses and other liabilities that are classified as current at the end of the reporting period. Accrued Expenses and Other Liabilities Disclosure, Current [Text Block] Accrued Expenses and Other Liabilities