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Income Tax - Additional Information (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Statutory tax rate 25.00% 25.00% 25.00%
Withholding tax rate 10.00%    
Investments in subsidiaries and joint venture ¥ 217,324,000 ¥ 189,561,000  
Uncertain Tax Positions ¥ 1,395,000 411,000  
Subsidiaries Tax Years Remain Open To Examination 2018 through 2021    
Bottom of Range      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Tax losses carryforward period 1 year    
Withholding tax rate 5.00%    
Top of Range      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Tax losses carryforward period 5 years    
Withholding tax rate 10.00%    
Tax losses      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Tax losses ¥ 9,133,000 ¥ 550,000