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Income taxes - Principal components of the deferred tax assets and liabilities (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:        
Inventories ¥ 7,654 ¥ 6,431    
Allowance for doubtful accounts 2,049 487    
Intangible assets 268,381      
Accrued product warranties 23,037 8,483    
Accrued salaries and benefits 10,961 8,704    
Accrued expenses and other liabilities 11,677 48,520    
Unrealized investment loss of equity method investments 12,888 3,395    
Donation 503 450    
Operating lease liabilities 18,734      
Net operating loss carryforwards 180,378 473,845    
Total deferred tax assets 536,262 550,315    
Less: valuation allowance (518,017) ¥ (550,315) ¥ (362,371) ¥ (268,702)
Deferred tax assets, net of valuation allowance 18,245      
Deferred tax liabilities:        
Operating lease right-of-use assets (18,245)      
Total deferred tax liabilities ¥ (18,245)