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Related Party Transactions (Unsecured term loans granted to Particle) (Narrative) (Details)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2016
CNY (¥)
Nov. 30, 2016
CNY (¥)
Nov. 30, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Related Party Transaction [Line Items]              
Amounts due from related parties ¥ 156,260     ¥ 156,260   $ 22,506 ¥ 124,677
Particle [Member]              
Related Party Transaction [Line Items]              
Amounts due from related parties ¥ 50,337     50,337   7,250 ¥ 0
Total interest income arising from loans provided to Particle, convertible loans due from Particle and bank interest expenses incurred by the Company but borne by Particle       9,100 $ 1,300    
Particle [Member] | Loan Granted to Related Party in November 2016 [Member]              
Related Party Transaction [Line Items]              
Aggregate principal amount of short-term unsecured loans authorized   ¥ 120,000          
Interest rate of short-term unsecured loans   9.00% 9.00%        
Maturity of short-term unsecured loans 12 months 6 months 6 months        
Principal amount of loans granted to Particle   ¥ 45,900 $ 6,800        
Amounts due from related parties ¥ 47,800     ¥ 47,800   $ 6,900