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Restricted short-term deposits (Narrative) (Details) - Dec. 31, 2019
¥ in Thousands, $ in Millions, $ in Millions
USD ($)
CNY (¥)
HKD ($)
Restricted Cash And Investments [Line Items]      
Restricted Of Short Term Deposit   ¥ 653,034  
Loans Payable      
Restricted Cash And Investments [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 40   $ 320