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Revenue (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue    
Period of unconditional right of return 7 days  
Deferred income ¥ 1,954 ¥ 1,564
Number of instalment period 12 months  
Amount of unfulfilled performance obligations ¥ 1,410,000  
Contract balances    
Amount of contract assets balance 151,117 140,361
Contract liabilities 1,954 1,564
Weipin Coins    
Disaggregation of Revenue    
Deferred income 150,240 138,863
Amount of unfulfilled performance obligations 355,000  
Contract balances    
Contract liabilities ¥ 150,240 ¥ 138,863
Maximum    
Disaggregation of Revenue    
Number of instalment period 24 months