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Property and equipment, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2020
USD ($)
Property and equipment, net [Line Items]          
Subtotal ¥ 502,513   ¥ 493,739   $ 77,014
Less: Accumulated depreciation (435,393)   (325,304)   (66,728)
Property and equipment subject to depreciation 67,120   168,435   10,286
Construction in progress 44,577   54,905   6,832
Total 111,697   223,340   17,118
Depreciation expenses 127,836 $ 19,592 87,887 ¥ 66,903  
Computers and equipment [Member]          
Property and equipment, net [Line Items]          
Subtotal 142,277   149,191   21,805
Leasehold improvements [Member]          
Property and equipment, net [Line Items]          
Subtotal 131,923   119,934   20,218
Buildings [Member]          
Property and equipment, net [Line Items]          
Subtotal 4,308   4,466   660
Furniture and fixtures [Member]          
Property and equipment, net [Line Items]          
Subtotal 16,860   18,339   2,584
Vehicles [Member]          
Property and equipment, net [Line Items]          
Subtotal 19,925   15,483   3,054
Software [Member]          
Property and equipment, net [Line Items]          
Subtotal 185,118   184,282   28,371
Others          
Property and equipment, net [Line Items]          
Subtotal 2,102   2,044   $ 322
Depreciation Expense [Member]          
Property and equipment, net [Line Items]          
Depreciation expenses ¥ 127,836   ¥ 84,273 ¥ 67,077