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Property and Equipment, Net - Depreciation expenses (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Property Plant And Equipment [Abstract]        
Depreciation expenses ¥ 35.6 $ 5.1 ¥ 29.4 ¥ 32.2