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Loss Per Share (Details)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
CNY (¥)
¥ / shares
shares
Dec. 31, 2017
CNY (¥)
¥ / shares
shares
Dec. 31, 2016
CNY (¥)
¥ / shares
shares
Numerator:        
Net loss $ (1,486,020) ¥ (10,217,125) ¥ (525,115) ¥ (291,977)
Deemed distribution to certain holders of Convertible Preferred Shares (11,708) (80,496)   (30,430)
Contribution from a holder of convertible preferred shares | ¥     26,413  
Net loss attributable to ordinary shareholders $ (1,497,728) ¥ (10,297,621) ¥ (498,702) ¥ (322,407)
Denominator:        
Weighted-average number of Ordinary Shares outstanding-basic and diluted | shares 2,968,320 2,968,320 1,764,799 1,815,200
Loss per share-basic and diluted | (per share) $ (0.50) ¥ (3.47) ¥ (0.28) ¥ (0.18)