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Summary of significant accounting policies (Details)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2016
CNY (¥)
¥ / shares
Dec. 31, 2015
CNY (¥)
¥ / shares
Dec. 31, 2014
CNY (¥)
¥ / shares
Dec. 31, 2016
CNY (¥)
Dec. 30, 2016
Reclassifications            
Accounts receivable $ (2,515,398)   ¥ (8,193,665)   ¥ (17,464,408)  
Loan receivables 1,828,880   3,698,488   12,697,915  
Cash flows resulted from loan receivables that have been reclassified from operating activities to investing activities     3,507,873 ¥ 274,885    
Revision of previously issued financial statements            
Net revenues 37,465,310 ¥ 260,121,645 181,275,425 115,002,317    
Share of results of equity investees (401,173) (2,785,343) (2,852,677)      
Net loss $ (491,678) ¥ (3,413,724) ¥ (9,117,506) ¥ (4,996,358)    
Net loss per share - basic | (per share) $ (0.20) ¥ (1.36) ¥ (3.33) ¥ (5.35)    
Net loss per share - diluted | (per share) $ (0.20) ¥ (1.36) ¥ (3.33) ¥ (5.35)    
Investment in equity investees $ 2,194,300   ¥ 8,713,219   15,235,020  
Deferred revenues - current 175,986   983,721   1,221,865  
Deferred revenues - non-current 310,649   2,556,345   2,156,835  
Accumulated deficit (3,148,545)   (18,420,834)   (21,860,345)  
Accumulated other comprehensive income 222,295   554,826   1,543,393  
Foreign currency translation            
Total exchange gains/(losses) (21,079) ¥ (146,354) (57,395) ¥ (28,980)    
Total foreign currency translation adjustments gain (loss) 135,909 ¥ 943,616 954,787 ¥ (121,612)    
Convenience translation            
Convenience translation rate (RMB to USD)           6.9430
Loan receivables, net            
Loan receivables, net 1,828,880   3,698,488   12,697,915  
Allowance for doubtful accounts     87,996   251,813  
Construction in progress            
Amount of construction in progress $ 286,925   1,266,992   ¥ 1,992,123  
Reclassifications            
Reclassifications            
Accounts receivable     1,314,619      
Loan receivables     1,314,619      
Loan receivables, net            
Loan receivables, net     1,314,619      
As reported            
Revision of previously issued financial statements            
Net revenues     181,286,955      
Share of results of equity investees     (3,134,283)      
Net loss     ¥ (9,387,582)      
Net loss per share - basic | ¥ / shares     ¥ (3.43)      
Net loss per share - diluted | ¥ / shares     ¥ (3.43)      
Investment in equity investees     ¥ 8,864,249      
Deferred revenues - current     1,028,350      
Deferred revenues - non-current     2,705,164      
Accumulated deficit     (18,690,910)      
Accumulated other comprehensive income     782,484      
Revision            
Revision of previously issued financial statements            
Net revenues     (11,530)      
Share of results of equity investees     281,606      
Net loss     ¥ 270,076      
Net loss per share - basic | ¥ / shares     ¥ 0.10      
Net loss per share - diluted | ¥ / shares     ¥ 0.10      
Investment in equity investees     ¥ (151,030)      
Deferred revenues - current     (44,629)      
Deferred revenues - non-current     (148,819)      
Accumulated deficit     270,076      
Accumulated other comprehensive income     ¥ (227,658)      
Minimum            
Loan receivables, net            
Loan periods extended range 1 day 1 day        
Maximum            
Loan receivables, net            
Loan periods extended range 36 months 36 months        
Electronic equipment            
Property, equipment and software, net            
Estimated useful Lives (in Years) 3 years 3 years        
Office equipment            
Property, equipment and software, net            
Estimated useful Lives (in Years) 5 years 5 years        
Vehicles            
Property, equipment and software, net            
Estimated useful Lives (in Years) 5 years 5 years        
Logistic and warehouse equipment            
Property, equipment and software, net            
Estimated useful Lives (in Years) 5 years 5 years        
Leasehold improvement            
Property, equipment and software, net            
Estimated useful Lives (in Years) Over the shorter of the expected life of leasehold improvements or the lease term Over the shorter of the expected life of leasehold improvements or the lease term        
Software | Minimum            
Property, equipment and software, net            
Estimated useful Lives (in Years) 3 years 3 years        
Software | Maximum            
Property, equipment and software, net            
Estimated useful Lives (in Years) 5 years 5 years        
Building            
Property, equipment and software, net            
Estimated useful Lives (in Years) 40 years 40 years        
Building improvement | Minimum            
Property, equipment and software, net            
Estimated useful Lives (in Years) 5 years 5 years        
Building improvement | Maximum            
Property, equipment and software, net            
Estimated useful Lives (in Years) 10 years 10 years