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Certain Risks and Concentration (Credit Risk) (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Concentration Risk [Line Items]      
Convertible loans due from a related party ¥ 104,429 $ 15,041 ¥ 0
Amounts due from related parties 156,260 22,506 124,677
Particle [Member]      
Concentration Risk [Line Items]      
Amounts due from related parties 50,337 7,250 ¥ 0
Particle [Member] | Loan Granted to Related Party in November 2016 [Member]      
Concentration Risk [Line Items]      
Amounts due from related parties ¥ 47,800 $ 6,900