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Deferred government grant (Narrative) (Details) - 12 months ended Dec. 31, 2017
¥ in Millions
USD ($)
CNY (¥)
Deferred Government Grant 1 | ¥   ¥ 150.0
Deferred Government Grant 2 $ 23,103,427  
Deferred Government Grant 3 1,004,027  
Deferred Government Grant 4 | ¥   ¥ 46.2
Deferred Government Grant 5 7,100,000  
Deferred Government Grant 6 201,847  
Deferred Government Grant 7 36,183  
Deferred Government Grant 8 $ 146,311