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Share capital and additional paid-in capital (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of classes of share capital [line items]    
Beginning balance, amount ¥ 396,001 ¥ 240,001
Shares issued during the year, Amount 26 156,000
Share issuance expenses (7,385)  
Ending balance, amount ¥ 388,642 ¥ 396,001
Number of shares [Member]    
Disclosure of classes of share capital [line items]    
Beginning balance, shares 227,717 227,717
Shares issued during the year, Amount ¥ 772,283
Share issuance expenses  
Ending balance, shares 1,000,000 227,717
Ordinary shares [Member]    
Disclosure of classes of share capital [line items]    
Beginning balance, amount ¥ 77 ¥ 77
Shares issued during the year, Amount 248
Share issuance expenses  
Ending balance, amount 325 77
Additional paid-in capital    
Disclosure of classes of share capital [line items]    
Beginning balance, amount 395,924 239,924
Shares issued during the year, Amount (222) 156,000
Share issuance expenses (7,385)  
Ending balance, amount 388,317 395,924
Non-controlling interests [Member]    
Disclosure of classes of share capital [line items]    
Beginning balance, amount 99,000 60,000
Shares issued during the year, Amount 7 39,000
Share issuance expenses (1,846)  
Ending balance, amount 97,161 99,000
Total Equity [member]    
Disclosure of classes of share capital [line items]    
Beginning balance, amount 495,001 300,001
Shares issued during the year, Amount 33 195,000
Share issuance expenses (9,231)  
Ending balance, amount ¥ 485,803 ¥ 495,001