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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) - CNY (¥)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS      
Unrealized gains/(losses), tax ¥ 0 ¥ 0 ¥ 0
Reclassification adjustment for (gains)/losses recorded in net income, tax ¥ 0 ¥ 0 ¥ 0