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Accounts Receivable, Net - Balance of accounts receivable (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Accounts Receivable Net [Abstract]            
Accounts receivable, gross ¥ 757,158 $ 108,759 ¥ 562,797      
Allowance for doubtful accounts (118,886) (17,077) (78,684) $ (11,302) ¥ (65,454) ¥ (91,348)
Accounts receivable, net ¥ 638,272 $ 91,682 ¥ 484,113