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Taxation (Details 3) - CNY (¥)
¥ / shares in Units, ¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of differences between statutory tax rate and effective tax rate        
Statutory income tax rate (as a percent) 25.00% 25.00% 25.00%  
Tax effect of preferential tax rates and tax holiday (2.30%) (8.10%) 8.30%  
Tax effect of tax-exempt entities (as a percent) (16.80%) 3.70% (1.90%)  
Effect on tax rates in different tax jurisdiction (as a percent) (0.50%) (3.90%) 2.20%  
Tax effect of non-deductible expenses (as a percent) 0.50% 5.70% (42.40%)  
Tax effect of non-taxable income (as a percent) 0.00% (1.00%) 3.80%  
Tax effect of Super Deduction and others (as a percent) (4.20%) (13.20%) 53.90%  
Changes in valuation allowance (as a percent) 1.20% 5.00% (66.90%)  
Effective tax rates (as a percent) 2.90% 13.20% (18.00%)  
Effect of tax holiday        
Tax holiday effect ¥ 1,153,349 ¥ 1,115,598 ¥ 198,118  
Effect of tax holiday on basic net income/(loss) per share ¥ 0.38 ¥ 0.38 ¥ 0.07  
Effect of tax holiday on diluted net income/(loss) per share ¥ 0.37 ¥ 0.38 ¥ 0.07  
Deferred tax assets        
Net operating loss carry forwards and others ¥ 3,144,116 ¥ 2,775,074    
Deferred revenues 208,335 137,128    
Inventory valuation allowance 498,010 271,605    
Allowance for doubtful accounts 382,459 214,932    
Unrealized fair value losses for certain investments 588,690 356,259    
Less: valuation allowance (4,288,864) (3,674,442) ¥ (2,996,294) ¥ (1,480,570)
Net deferred tax assets 532,746 80,556    
Deferred tax liabilities        
Intangible assets arisen from business combination 1,560,099 748,691    
Accelerated tax depreciation and others 361,732 590,297    
Total deferred tax liabilities 1,921,831 ¥ 1,338,988    
Company's subsidiaries incorporated in Singapore and Hong Kong        
Net operating loss carry forwards        
Net operating loss carry forwards 7,246,591      
Company's subsidiaries, consolidated VIEs and VIEs' subsidiaries established in PRC and Indonesia        
Net operating loss carry forwards        
Net operating loss carry forwards ¥ 8,102,332