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Property and Equipment, Net - Depreciation expenses (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Property and Equipment, Net        
Depreciation expenses $ 863 ¥ 5,934 ¥ 2,265 ¥ 756
Costs of revenues        
Property and Equipment, Net        
Depreciation expenses 188 1,291 553 321
Sales and marketing expenses        
Property and Equipment, Net        
Depreciation expenses 117 805 546 163
General and administrative expenses        
Property and Equipment, Net        
Depreciation expenses 156 1,074 181 68
Research and development expenses        
Property and Equipment, Net        
Depreciation expenses $ 402 ¥ 2,764 ¥ 985 ¥ 204