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Property and equipment, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2015
CNY (¥)
Property and equipment, net [Line Items]          
Property and equipment, gross $ 31,336   ¥ 105,908   ¥ 202,990
Less: Accumulated depreciation (9,770)   (36,542)   (63,287)
Property and equipment subject to depreciation 21,566   69,366   139,703
Construction in progress 848   2,944   5,487
Property and equipment, net 22,414   72,310   145,190
Depreciation expenses 4,329 ¥ 28,041 10,869 ¥ 8,764  
Computers and equipment [Member]          
Property and equipment, net [Line Items]          
Property and equipment, gross 13,758   43,961   89,127
Leasehold improvements [Member]          
Property and equipment, net [Line Items]          
Property and equipment, gross 11,084   ¥ 43,684   71,800
Buildings [Member]          
Property and equipment, net [Line Items]          
Property and equipment, gross 398     2,578
Furniture and fixtures [Member]          
Property and equipment, net [Line Items]          
Property and equipment, gross 2,390   ¥ 6,343   15,479
Vehicles [Member]          
Property and equipment, net [Line Items]          
Property and equipment, gross 24     156
Software [Member]          
Property and equipment, net [Line Items]          
Property and equipment, gross $ 3,682   ¥ 11,920   23,850
Property and equipment, net         ¥ 12,376