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Accrued liabilities and other payables - Schedule of Accrued Liabilities and Other Payables (Parenthetical) (Details) - 12 months ended Dec. 31, 2017 - Kankan [Member]
USD ($)
CNY (¥)
Disposal Group Including Discontinued Operation, Amount Of Accrual Of Unsettled Balances As Legal Expenses $ 3,074,000  
Disposal Group, Including Discontinued Operation, Accounts Payable 2,769,000 ¥ 18,094,000
Proceeds from Collection of Notes Receivable $ 1,732,000