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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Significant Risks and Uncertainties) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
customer
Dec. 31, 2016
CNY (¥)
customer
Dec. 31, 2015
CNY (¥)
customer
Dec. 31, 2014
CNY (¥)
Dec. 31, 2016
CNY (¥)
Significant Risks and Uncertainties          
Cash and cash equivalents $ 139,453   ¥ 846,120 ¥ 1,378 ¥ 968,225
Net revenue $ 466,368 ¥ 3,237,991 1,313,639 196,525  
Cash and cash equivalents | Foreign currency risk | RMB          
Significant Risks and Uncertainties          
Cash and cash equivalents     347,506   ¥ 564,240
Representing greater than 10% of total net revenue from single customer | Customer concentration risk          
Significant Risks and Uncertainties          
Net revenue   ¥ 0 ¥ 0 ¥ 0  
Representing greater than 10% of accounts receivable | Customer concentration risk          
Significant Risks and Uncertainties          
Number of customers | customer 0 0 0