Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Summary of Property and Equipment

Property and equipment consist of the following:

	December 31,
	2015			2016
	RMB			RMB			US$
At cost:
Electronic equipment		177,862			234,360			33,756
Office equipment		851			1,024			147
Motor vehicles		2,511			3,418			492
Purchased and internally-developed software		16,629			26,480			3,814
Leasehold improvements		29,872			42,364			6,102
		227,725			307,646			44,311
Less: Accumulated depreciation		(124,171	)		(173,072	)		(24,928	)
		103,554			134,574			19,383