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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - CNY (¥)
¥ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS    
Foreign currency translation adjustments, tax ¥ 0 ¥ 0