000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 110200 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 110201 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 124100 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF (LOSS) INCOME AND COMPREHENSIVE (LOSS) INCOME link:presentationLink link:calculationLink link:definitionLink 148600 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY link:presentationLink link:calculationLink link:definitionLink 170000 - Statement - UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 200000 - Disclosure - Organization and nature of business link:presentationLink link:calculationLink link:definitionLink 290000 - Disclosure - Summary of significant accounting policies link:presentationLink link:calculationLink link:definitionLink 320000 - Disclosure - Accounts receivable link:presentationLink link:calculationLink link:definitionLink 340000 - Disclosure - Inventory link:presentationLink link:calculationLink link:definitionLink 340001 - Disclosure - Advances to suppliers net link:presentationLink link:calculationLink link:definitionLink 340002 - Disclosure - Other receivable link:presentationLink link:calculationLink link:definitionLink 340003 - Disclosure - Loan to a third party link:presentationLink link:calculationLink link:definitionLink 340004 - Disclosure - Acquisition reversal receivable link:presentationLink link:calculationLink link:definitionLink 340005 - Disclosure - Long-term investments, net link:presentationLink link:calculationLink link:definitionLink 340006 - Disclosure - Intangible assets, net link:presentationLink link:calculationLink link:definitionLink 360000 - Disclosure - Property and equipment, net link:presentationLink link:calculationLink link:definitionLink 842000 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 842001 - Disclosure - Convertible note link:presentationLink link:calculationLink link:definitionLink 842002 - Disclosure - Accrued expenses and other current liabilities link:presentationLink link:calculationLink link:definitionLink 845000 - Disclosure - Related party transactions link:presentationLink link:calculationLink link:definitionLink 845001 - Disclosure - Shareholders equity link:presentationLink link:calculationLink link:definitionLink 845002 - Disclosure - Concentration of major customers and suppliers link:presentationLink link:calculationLink link:definitionLink 845003 - Disclosure - Commitments and contingencies link:presentationLink link:calculationLink link:definitionLink 845004 - Disclosure - Segment reporting link:presentationLink link:calculationLink link:definitionLink 845005 - Disclosure - Business combination link:presentationLink link:calculationLink link:definitionLink 870000 - Disclosure - Subsequent events link:presentationLink link:calculationLink link:definitionLink 870001 - Disclosure - Significant accounting policies (Policies) link:presentationLink link:calculationLink link:definitionLink 870002 - Disclosure - Organization and nature of business (Tables) link:presentationLink link:calculationLink link:definitionLink 870003 - Disclosure - Summary of significant accounting policies (Tables) link:presentationLink link:calculationLink link:definitionLink 870004 - Disclosure - Accounts receivable (Tables) link:presentationLink link:calculationLink link:definitionLink 870005 - Disclosure - Inventories (Tables) link:presentationLink link:calculationLink link:definitionLink 870006 - Disclosure - Advances to suppliers net (Tables) link:presentationLink link:calculationLink link:definitionLink 870007 - Disclosure - Other receivable (Tables) link:presentationLink link:calculationLink link:definitionLink 870008 - Disclosure - Loan to a third party (Tables) link:presentationLink link:calculationLink link:definitionLink 870009 - Disclosure - Acquisition reversal receivable (Tables) link:presentationLink link:calculationLink link:definitionLink 870010 - Disclosure - Long-term investments (Tables) link:presentationLink link:calculationLink link:definitionLink 870011 - Disclosure - Intangible assets, net (Tables) link:presentationLink link:calculationLink link:definitionLink 870012 - Disclosure - Property and equipment, net (Tables) link:presentationLink link:calculationLink link:definitionLink 870013 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 870014 - Disclosure - Convertible note (Tables) link:presentationLink link:calculationLink link:definitionLink 870015 - Disclosure - Accrued expenses and other current liabilities (Tables) link:presentationLink link:calculationLink link:definitionLink 870016 - Disclosure - Segment reporting (Tables) link:presentationLink link:calculationLink link:definitionLink 870017 - Disclosure - Business combination (Tables) link:presentationLink link:calculationLink link:definitionLink 870018 - Disclosure - Organization and nature of business (Details) link:presentationLink link:calculationLink link:definitionLink 870019 - Disclosure - Organization and nature of business (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870020 - Disclosure - Summary of significant accounting policies (Details) link:presentationLink link:calculationLink link:definitionLink 870021 - Disclosure - Summary of significant accounting policies (Details 1) link:presentationLink link:calculationLink link:definitionLink 870022 - Disclosure - Summary of significant accounting policies (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870023 - Disclosure - Accounts receivable (Details) link:presentationLink link:calculationLink link:definitionLink 870024 - Disclosure - Accounts receivable (Details 1) link:presentationLink link:calculationLink link:definitionLink 870025 - Disclosure - Accounts receivable (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870026 - Disclosure - Inventories net (Details) link:presentationLink link:calculationLink link:definitionLink 870027 - Disclosure - Inventories net (Details 1) link:presentationLink link:calculationLink link:definitionLink 870028 - Disclosure - Advances to suppliers net (Details) link:presentationLink link:calculationLink link:definitionLink 870029 - Disclosure - Advances to suppliers net (Details 1) link:presentationLink link:calculationLink link:definitionLink 870030 - Disclosure - Other receivable (Details) link:presentationLink link:calculationLink link:definitionLink 870031 - Disclosure - Other receivable (Details 1) link:presentationLink link:calculationLink link:definitionLink 870032 - Disclosure - Other receivable (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870033 - Disclosure - Loan to a third party (Details) link:presentationLink link:calculationLink link:definitionLink 870034 - Disclosure - Loan to a third party (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870035 - Disclosure - Acquisition reversal receivable (Details) link:presentationLink link:calculationLink link:definitionLink 870036 - Disclosure - Acquisition reversal receivable (Details 1) link:presentationLink link:calculationLink link:definitionLink 870037 - Disclosure - Acquisition reversal receivable (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870038 - Disclosure - Long-term investments, net (Details) link:presentationLink link:calculationLink link:definitionLink 870039 - Disclosure - Long-term investments, net (Details 1) link:presentationLink link:calculationLink link:definitionLink 870040 - Disclosure - Long-term investments, net (Details 2) link:presentationLink link:calculationLink link:definitionLink 870041 - Disclosure - Long-term investments, net (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870042 - Disclosure - Intangible assets, net (Details) link:presentationLink link:calculationLink link:definitionLink 870043 - Disclosure - Intangible assets, net (Details 1) link:presentationLink link:calculationLink link:definitionLink 870044 - Disclosure - Intangible assets, net (Details narrative) link:presentationLink link:calculationLink link:definitionLink 870045 - Disclosure - Property and equipment net (Details) link:presentationLink link:calculationLink link:definitionLink 870046 - Disclosure - Property and equipment net (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870047 - Disclosure - Leases (Details) link:presentationLink link:calculationLink link:definitionLink 870048 - Disclosure - Leases (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870049 - Disclosure - Convertible note (Details) link:presentationLink link:calculationLink link:definitionLink 870050 - Disclosure - Convertible note (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870051 - Disclosure - Accrued expenses and other current liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 870052 - Disclosure - Related party transactions (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870053 - Disclosure - Shareholders equity (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870054 - Disclosure - Concentration of major customers and suppliers (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870055 - Disclosure - Commitments and contingencies (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 870056 - Disclosure - Segment reporting (Details) link:presentationLink link:calculationLink link:definitionLink 870057 - Disclosure - Segment reporting (Details 1) link:presentationLink link:calculationLink link:definitionLink 870058 - Disclosure - Segment reporting (Details 2) link:presentationLink link:calculationLink link:definitionLink 870059 - Disclosure - Business combination (Details) link:presentationLink link:calculationLink link:definitionLink 870060 - Disclosure - Business combination (Details Narrative) link:presentationLink link:calculationLink link:definitionLink