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Property, Equipment and Software, Net - Depreciation expenses (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Property, Equipment and Software, Net        
Depreciation expenses $ 2,600 ¥ 18,098 ¥ 5,934 ¥ 2,265
Costs of revenues        
Property, Equipment and Software, Net        
Depreciation expenses 518 3,603 1,291 553
Sales and marketing expenses        
Property, Equipment and Software, Net        
Depreciation expenses 347 2,415 805 546
General and administrative expenses        
Property, Equipment and Software, Net        
Depreciation expenses 273 1,901 1,074 181
Research and development expenses        
Property, Equipment and Software, Net        
Depreciation expenses $ 1,462 ¥ 10,179 ¥ 2,764 ¥ 985