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Long-term investments - Additional Information (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2020
USD ($)
Feb. 28, 2019
CNY (¥)
Dec. 31, 2016
CNY (¥)
Other than Temporary Impairment Losses, Investments ¥ 49,502 $ 7,587          
Equity Method Investments 43,689   ¥ 99,338   $ 6,696    
Other Long-term Investments 78,325   994,922   12,004    
Debt Securities, Held-to-maturity 2,653   10,502 ¥ 10,502 $ 406    
Income (Loss) from Equity Method Investments 797 122 2,223        
Remeasurement of Equity Investments 9,021 $ 1,383 ¥ (18,356) ¥ (12,581)      
Nanjing Zhongshan Financial Leasing Co., Ltd [Member]              
Equity Method Investment, Ownership Percentage             25.00%
Cost Method Investments 43,689,000            
Equity Method Investments             ¥ 42,500,000
Income (Loss) from Equity Method Investments 2,000            
Nanjing Tengbang Jinhong Tourism Industry Investment Fund Partnership [Member]              
Equity Method Investment, Ownership Percentage           21.33%  
Equity Method Investments           ¥ 54,616,000  
Income (Loss) from Equity Method Investments ¥ 799,000