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Taxation - Deferred tax assets and liabilities (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets        
Net operating loss carry-forwards ¥ 9,711,744 ¥ 7,294,844 ¥ 6,831,387  
Accrued and prepaid expenses 1,666,519 1,136,278 534,693  
Deferred revenue 940,633 559,815 251,778  
Tax credit carry-forwards 301,437 243,198 233,326  
Property, plant and equipment, net     64,191  
Unrealized financing income 33,140 28,796 40,800  
Intangible assets 89,328 85,439 36,702  
Allowance against receivables 27,386 19,500 9,027  
Deferred rent 29,731   9,791  
Share-based compensation 6,951 10,695 6,857  
Write-downs of inventory 452 713 1,162  
Advertising expenses in excess of deduction limit 188 705 507  
Equity securities with readily determinable fair value 150      
Unrealized foreign exchange loss 1,704   (971)  
Others 4,224 711 269  
Less: Valuation allowance (12,727,355) (9,216,725) ¥ (8,019,519) ¥ (6,879,030)
Subtotal 86,232 163,969    
Deferred tax liabilities        
Equity securities without readily determinable fair value 6,435 15,975    
Equity securities with readily determinable fair value   (2,725)    
Equity method investments (5,170)      
Available for sale debt investment (206,734) (6,499)    
Property, plant and equipment, net (86,082) (143,512)    
Deferred rent   (18,752)    
Unrealized foreign exchange loss   (1,705)    
Subtotal (304,421) (189,168)    
Total deferred tax liabilities, net ¥ (218,189) ¥ (25,199)