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Commitments (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Total minimum operating lease payments ¥ 5,007 ¥ 6,024
Less than one year [Member]    
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Total minimum operating lease payments 1,054 1,017
Between one and five years [Member]    
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Total minimum operating lease payments ¥ 3,953 ¥ 5,007