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Share-based payments (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of assumptions used in determining the fair value of the share options
Assumptions
 
2017
 
Expected dividend yield
   
0%
 
Risk-free interest rate
   
1.96%
 
Expected volatility
   
61.0%
 
Expected life
   
5 years
 
Exercise multiples
   
2.80 times
  
Weighted average fair value of underlying ordinary shares (US$/share)
   
25.09
 
Schedule of share option movements
 
Options
outstanding
 
  
Weighted
average
exercise
price per
share
 
  
Weighted
average
remaining
contractual
years to
expiry per
share
 
  
Weighted
average
fair value
at grant
date
 
  
Weighted
average
intrinsic
value per
option
 
  
Aggregate
intrinsic
value
 
  
US$
   
US$
 
  
US$
 
  
US$
 
Outstanding as of December 31, 2016
   
1,872,941
     
0.78
     
4,97 years
     
     
     
 
                                                 
Granted
   
1,320,000
     
68.35
     
4.00 years
     
     
     
 
Exercised
   
(454,708
 )    
1.95
     
3.75 years
     
     
     
 
                                                 
Outstanding as of December 31, 2017
   
2,738,233
     
33.50
     
4.14 years
     
     
     
 
                                                 
Exercised
   
(
356,736
 )    
1.65
     
2.77 years
     
     
     
 
                                                 
Outstanding as of December 31, 2018
   
2,381,497
     
26.61
     
3.05 years
     
     
     
 
                                                 
Exercised
   
(85,706
)     
0.50
     
1.21 years
      
     
     
 
                                                 
Outstanding as of December 31, 2019
   
2,295,791
     
27.59
     
2.09 years
      
     
     
 
                                                 
Non-vested
as of December 31, 2019
    
357,500
     
 
      
 
      
     
     
 
Options vested and expected to vest as of December 31, 2019
   
2,295,791
     
27.59
     
2.09 years
      
18.31
      
43.26
      
99,318,793
 
Exercisable as of December 31, 201
9
    
1,938,291
     
23.95
     
2.10 years
      
16.47
      
46.90
      
90,908,615
  
Schedule of non-vested shares movement
         
 
Non-vested
 shares
outstanding
 
Outstanding as of January 1, 2017
   
2,419,865
 
         
Granted
   
2,900,580
 
Vested
   
(925,623
 )
Forfeited
   
(464,564
 )
         
Outstanding as of December 31, 2017
   
3,930,258
 
Granted
   
1,102,576
 
Vested
   
(1,322,560
 )
Forfeited
   
(786,772
 )
         
Outstanding as of December 31, 2018
   
2,923,502
 
         
Granted
   
2,418,556
 
Vested
   
(1,102,773
)
Forfeited
   
(839,468
)
         
Outstanding as of December 31, 2019
   
3,399,817
 
         
 
 
 
 
 
 
Schedule of share-based compensation expenses
                         
 
Year ended December 31,
 
 
2017
 
  
2018
 
  
2019
 
 
RMB
 
  
RMB
 
  
RMB
 
Fulfillment expenses
   
(73,235
 )    
(73,151
 )    
(112,683
) 
Marketing expenses
   
(40,364
 )    
(41,063
 )    
(35,038
) 
Technology and content expenses
   
(206,073
 )    
(203,594
 )    
(180,493
) 
General and administrative expenses
   
(347,426
 )    
(353,402
 )    
(359,869
) 
                         
   
(667,098
 )    
(671,210
 )    
(688,083
)
                         
 
 
 
 
 
 
Shan Shan Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of assumptions used in determining the fair value of the share options
     
Assumptions
 
2019
Expected dividend yield
 
0%
Risk-free interest rate
 
2.53%~2.81%
Expected volatility
 
23.41%~24.02%
 
 
 
Total fair value of underlying registered capital
 
226,756