00000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 00000002 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 00000003 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 00000004 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) link:presentationLink link:calculationLink link:definitionLink 00000005 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 00000006 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 999012 - Disclosure - Nature of business and organization link:presentationLink link:calculationLink link:definitionLink 999013 - Disclosure - Summary of significant accounting policies link:presentationLink link:calculationLink link:definitionLink 999014 - Disclosure - Deconsolidation of subsidiaries link:presentationLink link:calculationLink link:definitionLink 999015 - Disclosure - Short-term investments link:presentationLink link:calculationLink link:definitionLink 999016 - Disclosure - Accounts receivable and allowance for credit losses link:presentationLink link:calculationLink link:definitionLink 999017 - Disclosure - Property and equipment, net link:presentationLink link:calculationLink link:definitionLink 999018 - Disclosure - Long-term investments link:presentationLink link:calculationLink link:definitionLink 999019 - Disclosure - Bank borrowings link:presentationLink link:calculationLink link:definitionLink 999020 - Disclosure - Convertible notes payable link:presentationLink link:calculationLink link:definitionLink 999021 - Disclosure - Taxes link:presentationLink link:calculationLink link:definitionLink 999022 - Disclosure - Concentration of risk link:presentationLink link:calculationLink link:definitionLink 999023 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 999024 - Disclosure - Shareholders’ equity link:presentationLink link:calculationLink link:definitionLink 999025 - Disclosure - Warrants link:presentationLink link:calculationLink link:definitionLink 999026 - Disclosure - Commitments and contingencies link:presentationLink link:calculationLink link:definitionLink 999027 - Disclosure - Segments link:presentationLink link:calculationLink link:definitionLink 999028 - Disclosure - Related party transactions and balances link:presentationLink link:calculationLink link:definitionLink 999029 - Disclosure - Subsequent events link:presentationLink link:calculationLink link:definitionLink 999030 - Disclosure - Summary of significant accounting policies (Policies) link:presentationLink link:calculationLink link:definitionLink 999031 - Disclosure - Nature of business and organization (Tables) link:presentationLink link:calculationLink link:definitionLink 999032 - Disclosure - Summary of significant accounting policies (Tables) link:presentationLink link:calculationLink link:definitionLink 999033 - Disclosure - Short-term investments (Tables) link:presentationLink link:calculationLink link:definitionLink 999034 - Disclosure - Accounts receivable and allowance for credit losses (Tables) link:presentationLink link:calculationLink link:definitionLink 999035 - Disclosure - Property and equipment, net (Tables) link:presentationLink link:calculationLink link:definitionLink 999036 - Disclosure - Long-term investments (Tables) link:presentationLink link:calculationLink link:definitionLink 999037 - Disclosure - Bank borrowings (Tables) link:presentationLink link:calculationLink link:definitionLink 999038 - Disclosure - Convertible notes payable (Tables) link:presentationLink link:calculationLink link:definitionLink 999039 - Disclosure - Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 999040 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 999041 - Disclosure - Warrants (Tables) link:presentationLink link:calculationLink link:definitionLink 999042 - Disclosure - Segments (Tables) link:presentationLink link:calculationLink link:definitionLink 999043 - Disclosure - Nature of business and organization (Details) link:presentationLink link:calculationLink link:definitionLink 999044 - Disclosure - Nature of business and organization (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999045 - Disclosure - Summary of significant accounting policies (Details) link:presentationLink link:calculationLink link:definitionLink 999046 - Disclosure - Summary of significant accounting policies (Details 1) link:presentationLink link:calculationLink link:definitionLink 999047 - Disclosure - Summary of significant accounting policies (Details 2) link:presentationLink link:calculationLink link:definitionLink 999048 - Disclosure - Summary of significant accounting policies (Details 3) link:presentationLink link:calculationLink link:definitionLink 999049 - Disclosure - Summary of significant accounting policies (Details 4) link:presentationLink link:calculationLink link:definitionLink 999050 - Disclosure - Summary of significant accounting policies (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999051 - Disclosure - Short term investments (Details) link:presentationLink link:calculationLink link:definitionLink 999052 - Disclosure - Short term investments (Details 1) link:presentationLink link:calculationLink link:definitionLink 999053 - Disclosure - Short-term investments (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999054 - Disclosure - Accounts receivable and allowance for credit losses (Details) link:presentationLink link:calculationLink link:definitionLink 999055 - Disclosure - Accounts receivable and allowance for credit losses (Details 1) link:presentationLink link:calculationLink link:definitionLink 999056 - Disclosure - Accounts receivable and allowance for credit losses (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999057 - Disclosure - Property and equipment, net (Details) link:presentationLink link:calculationLink link:definitionLink 999058 - Disclosure - Property and equipment, net (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999059 - Disclosure - Long-term investments (Details) link:presentationLink link:calculationLink link:definitionLink 999060 - Disclosure - Long-term investments (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999061 - Disclosure - Banking borrowings (Details) link:presentationLink link:calculationLink link:definitionLink 999062 - Disclosure - Bank borrowings (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999063 - Disclosure - Convertible notes payable (Details) link:presentationLink link:calculationLink link:definitionLink 999064 - Disclosure - Convertible notes payable (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999065 - Disclosure - Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 999066 - Disclosure - Taxes (Details 1) link:presentationLink link:calculationLink link:definitionLink 999067 - Disclosure - Taxes (Details 2) link:presentationLink link:calculationLink link:definitionLink 999068 - Disclosure - Taxes (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999069 - Disclosure - Concentration of risk (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999070 - Disclosure - Leases (Details) link:presentationLink link:calculationLink link:definitionLink 999071 - Disclosure - Leases (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999072 - Disclosure - Shareholders’ equity (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999073 - Disclosure - Warrants (Details) link:presentationLink link:calculationLink link:definitionLink 999074 - Disclosure - Warrants (Details Narrative) link:presentationLink link:calculationLink link:definitionLink 999075 - Disclosure - Segments (Details) link:presentationLink link:calculationLink link:definitionLink 999076 - Disclosure - Segments (Details 1) link:presentationLink link:calculationLink link:definitionLink 999077 - Disclosure - Related party transactions and balances (Details Narrative) link:presentationLink link:calculationLink link:definitionLink