0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952157 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Nature of business and organization link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Summary of significant accounting policies link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Accounts receivable, net link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Prepayments and other assets link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Property and equipment, net link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Intangible Assets, Net link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Short-term loans link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Shareholders' Equity link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Share-based compensation link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Income taxes link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Related party transactions and balances link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Concentrations of risks link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - Commitments and contingencies link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - Segment information link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Summary of significant accounting policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Nature of business and organization (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Summary of significant accounting policies (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Accounts receivable, net (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Prepayments and other assets (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Property and equipment, net (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Intangible Assets, Net (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Share-based compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Income taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Related party transactions and balances (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Segment information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Nature of business and organization (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Summary of significant accounting policies - Liquidity (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Summary of significant accounting policies - Foreign Currency Translation and Transaction (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Summary of significant accounting policies - Cash (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Summary of significant accounting policies - Property and Equipment, Net (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Summary of significant accounting policies - Intangible Assets, Net (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Summary of significant accounting policies - Impairment for Long-lived Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Summary of significant accounting policies - Revenues - General Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Summary of significant accounting policies - Revenues - Disaggregation by Product Line (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Summary of significant accounting policies - Revenues - Disaggregation by Geographic Location (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Summary of significant accounting policies - Assets by Geographic Location (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Summary of significant accounting policies - Shipping and Handling Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Summary of significant accounting policies - Share-based Compensation (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Summary of significant accounting policies - Non-controlling Interests (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Summary of significant accounting policies - Earnings (Loss) Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Accounts receivable, net - Composition (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Accounts receivable, net - Allowance for Doubtful Accounts Roll Forward (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Accounts receivable, net - Accrued Defective Return and Discount Accounts Roll Forward (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Prepayments and other assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Property and equipment, net - Property and Equipment, net (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Property and equipment, net - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Intangible Assets, Net - Schedule of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Intangible Assets, Net - Expected Amortization (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Leases - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Leases - Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Leases - Lease Term and Discount Rate (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Leases - Maturities of Operating Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Leases - Maturities of Operating Lease Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Short-term loans (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Shareholders' Equity (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Share-based compensation - General Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Share-based compensation - Share Options and RSU Activity - (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - Share-based compensation - Options - Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - Share-based compensation - Options - Fair Value Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - Share-based compensation - Share-based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - Share-based compensation - Unrecognized Share-based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - Income taxes - Pre-tax Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - Income taxes - Components of Income Tax Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - Income taxes - Effective Income Tax Rate Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - Income taxes - Schedule of Income Taxes Payable (Details) link:presentationLink link:calculationLink link:definitionLink 9955562 - Disclosure - Income taxes - Deferred Tax Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955563 - Disclosure - Income taxes - Operating Loss Carryforwards (Details) link:presentationLink link:calculationLink link:definitionLink 9955564 - Disclosure - Related party transactions and balances - Sales to a related party (Details) link:presentationLink link:calculationLink link:definitionLink 9955565 - Disclosure - Related party transactions and balances - Purchases of a related party (Details) link:presentationLink link:calculationLink link:definitionLink 9955566 - Disclosure - Related party transactions and balances - Shared Service and Miscellaneous Expenses - Tabular Disclosure (Details) link:presentationLink link:calculationLink link:definitionLink 9955567 - Disclosure - Related party transactions and balances - Accounts Payables (Details) link:presentationLink link:calculationLink link:definitionLink 9955568 - Disclosure - Related party transactions and balances - Shared Service and Miscellaneous Expenses - General Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955569 - Disclosure - Related party transactions and balances - Loan Guarantee by Related Party (Details) link:presentationLink link:calculationLink link:definitionLink 9955570 - Disclosure - Concentrations of risks - Credit Risk (Details) link:presentationLink link:calculationLink link:definitionLink 9955571 - Disclosure - Concentrations of risks - Customer Concentration Risk (Details) link:presentationLink link:calculationLink link:definitionLink 9955572 - Disclosure - Concentrations of risks - Vendor Concentration Risk (Details) link:presentationLink link:calculationLink link:definitionLink 9955573 - Disclosure - Segment Information - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955574 - Disclosure - Segment information - Schedule of Segment Financial Information (Details) link:presentationLink link:calculationLink link:definitionLink