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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets        
Tax losses carried forward ¥ 71,668 ¥ 102,239    
Write-down of inventories 108,229 10,771    
Property, equipment and software 34,905 0    
Share-based compensation 30,835 0    
Allowance for doubtful accounts 1,416 1,314    
Warranty reserve 967 2,704    
Subtotal 248,020 117,028    
Less: Valuation allowance (96,610) (17,984) ¥ (304,790) ¥ (254,039)
Deferred tax assets ¥ 151,410 ¥ 99,044