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Prepaid expenses and others (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Prepaid Expenses And Others Details    
Prepaid professional fees ¥ 11,130
Prepaid expenses 483 26
Prepayment for property 14,928
Total ¥ 15,411 ¥ 11,156