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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS      
Other comprehensive income/(loss), tax ¥ 0 ¥ 0 ¥ 0
Foreign currency translation difference, tax ¥ 0 ¥ 0 ¥ 0