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Revenues- Contract balances (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Jan. 01, 2018
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Revenues          
Customer advances ¥ 56,453   $ 27,850 ¥ 191,482 ¥ 56,453
Customer liability 38,935   $ 10,609 ¥ 72,939  
Revenues recognized from the carrying value of customer advances and contract liability ¥ 44,704 ¥ 38,935