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Summary of significant accounting policies - Others (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2022
CNY (¥)
segment
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2022
USD ($)
Goodwill          
Impairment of goodwill ¥ 0 ¥ 0 ¥ 37,593    
Impairment of Long-lived Assets          
Impairment of long-lived assets ¥ 0 ¥ 3,096 ¥ 31,765    
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] Goodwill and Intangible Asset Impairment Goodwill and Intangible Asset Impairment Goodwill and Intangible Asset Impairment    
Financial Guarantee liabilities          
Gain on guarantee liability ¥ 9,662 ¥ 27,035 ¥ 138,483    
Maximum potential future payment 11,158 30,275      
Allowance for guarantee assets 171 387 8,053    
Revenue recognition          
Contract liabilities   1,885 6,890 ¥ 66,576  
Accounts receivable, net 18,627 36,854     $ 2,701
Impairment loss on equity investment 36,600 0 15,908    
Impairment loss on equity investment without readily determinable fair values ¥ 50,000 0 0    
Value added Tax ("VAT")          
Percentage of value added tax 6.00%        
Segment reporting          
Number of reportable segment | segment 1        
Statutory reserves          
Appropriation to the statutory surplus fund, minimum percentage of after-tax profits 10.00%        
Maximum percentage of statutory surplus fund to registered capital 50.00%        
Transfer of reserves ¥ 0        
Profit appropriation to general reserve fund and statutory surplus fund ¥ 716 516 1,104    
Operating lease term 12 months       12 months
Right-of-use assets ¥ 0        
Lease liabilities 0        
Underpayment of taxes ¥ 100       $ 15
Period of statue of limitation 10 years        
Allowance for bad debts ¥ 7,107 4,396 369 ¥ 4,780  
Amortization of intangible asset 0 ¥ 3,526 ¥ 11,709    
Prior period errors relating to accounts receivable 6,047        
Restatement adjustment          
Statutory reserves          
Allowance for bad debts 2,903        
Impairment of intangible assets 3,096        
Amortization of intangible asset ¥ 3,688