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Property and Equipment, Net (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Property and Equipment, Net      
At cost $ 5,499 ¥ 37,802 ¥ 12,275
Less: accumulated depreciation (1,270) (8,727) (2,996)
Property and Equipment, Net 4,229 29,075 9,279
Computer and office equipment      
Property and Equipment, Net      
At cost 3,949 27,148 7,256
Leasehold improvement      
Property and Equipment, Net      
At cost $ 1,550 ¥ 10,654 ¥ 5,019