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Property and Equipment, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Property and equipment, net          
Total     ¥ 17,908   ¥ 22,595
Less: accumulated depreciation     (2,436)   (6,631)
Property and equipment, net $ 2,293   15,472   15,964
Depreciation expense $ 603 ¥ 4,195 1,585 ¥ 487  
Electronic equipment and computers          
Property and equipment, net          
Total     13,267   16,274
Office furniture and equipment          
Property and equipment, net          
Total     1,575   2,130
Leasehold improvement          
Property and equipment, net          
Total     ¥ 3,066   ¥ 4,191