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Organization and Principal Activities - Others (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Variable Interest Entity [Line Items]        
Minimum period to maintain structure and corporate governance 5 years 5 years    
Consolidated VIEs        
Variable Interest Entity [Line Items]        
Net fee paid or payable to other subsidiaries of the Group by the consolidated VIEs after netting off inter-company transactions ¥ 3.8 $ 0.6 ¥ 31.7 ¥ 13.7