00000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 00000002 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 00000003 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 00000004 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME link:presentationLink link:calculationLink link:definitionLink 00000005 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 00000006 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 999007 - Disclosure - Nature of business and organization link:presentationLink link:calculationLink link:definitionLink 999008 - Disclosure - Summary of significant accounting policies link:presentationLink link:calculationLink link:definitionLink 999009 - Disclosure - Accounts receivable, net link:presentationLink link:calculationLink link:definitionLink 999010 - Disclosure - Contract assets/(liabilities) link:presentationLink link:calculationLink link:definitionLink 999011 - Disclosure - Property and equipment, net link:presentationLink link:calculationLink link:definitionLink 999012 - Disclosure - Prepayment for long-term assets link:presentationLink link:calculationLink link:definitionLink 999013 - Disclosure - Other payables and accrued liabilities link:presentationLink link:calculationLink link:definitionLink 999014 - Disclosure - Related party balances and transactions link:presentationLink link:calculationLink link:definitionLink 999015 - Disclosure - Credit facilities link:presentationLink link:calculationLink link:definitionLink 999016 - Disclosure - Taxes link:presentationLink link:calculationLink link:definitionLink 999017 - Disclosure - Concentration and risks link:presentationLink link:calculationLink link:definitionLink 999018 - Disclosure - Shareholders’ equity link:presentationLink link:calculationLink link:definitionLink 999019 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 999020 - Disclosure - Commitments and contingencies link:presentationLink link:calculationLink link:definitionLink 999021 - Disclosure - Segment information link:presentationLink link:calculationLink link:definitionLink 999022 - Disclosure - Subsequent events link:presentationLink link:calculationLink link:definitionLink 999023 - Disclosure - Condensed financial information of the parent company link:presentationLink link:calculationLink link:definitionLink 999024 - Disclosure - Summary of significant accounting policies (Policies) link:presentationLink link:calculationLink link:definitionLink 999025 - Disclosure - Nature of business and organization (Tables) link:presentationLink link:calculationLink link:definitionLink 999026 - Disclosure - Summary of significant accounting policies (Tables) link:presentationLink link:calculationLink link:definitionLink 999027 - 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Disclosure - Contract assets/(liabilities) (Details) link:presentationLink link:calculationLink link:definitionLink 999045 - Disclosure - Contract assets/(liabilities) (Details 1) link:presentationLink link:calculationLink link:definitionLink 999046 - Disclosure - Contract assets/(liabilities) (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999047 - Disclosure - Property and equipment, net (Details) link:presentationLink link:calculationLink link:definitionLink 999048 - Disclosure - Property and equipment, net (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999049 - Disclosure - Prepayment for long-term assets (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999050 - Disclosure - Other payables and accrued liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 999051 - Disclosure - Related party balances and transactions (Details) link:presentationLink link:calculationLink link:definitionLink 999052 - Disclosure - Related party balances and transactions (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999053 - Disclosure - Credit facilities (Details) link:presentationLink link:calculationLink link:definitionLink 999054 - Disclosure - Credit facilities (Details 1) link:presentationLink link:calculationLink link:definitionLink 999055 - Disclosure - Credit facilities (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999056 - Disclosure - Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 999057 - Disclosure - Taxes (Details 1) link:presentationLink link:calculationLink link:definitionLink 999058 - Disclosure - Taxes (Details 2) link:presentationLink link:calculationLink link:definitionLink 999059 - Disclosure - Taxes (Details 3) link:presentationLink link:calculationLink link:definitionLink 999060 - Disclosure - Taxes (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999061 - Disclosure - Concentration and risks (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999062 - Disclosure - Shareholders' equity (Details) link:presentationLink link:calculationLink link:definitionLink 999063 - Disclosure - Shareholders’ equity (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999064 - Disclosure - Leases (Details) link:presentationLink link:calculationLink link:definitionLink 999065 - Disclosure - Leases (Details 1) link:presentationLink link:calculationLink link:definitionLink 999066 - Disclosure - Leases (Details 2) link:presentationLink link:calculationLink link:definitionLink 999067 - Disclosure - Commitments and contingencies (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999068 - Disclosure - Segment information (Details) link:presentationLink link:calculationLink link:definitionLink 999069 - Disclosure - Condensed financial information of the parent company (Details) link:presentationLink link:calculationLink link:definitionLink 999070 - Disclosure - Condensed financial information of the parent company (Details 1) link:presentationLink link:calculationLink link:definitionLink 999071 - Disclosure - Condensed financial information of the parent company (Details 2) link:presentationLink link:calculationLink link:definitionLink