Accounts Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Schedule of Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable and allowance for doubtful accounts consist of the following:

	December 31,
	2015			2016
	RMB			RMB			US$
Accounts receivable		1,077,771			1,206,436			173,763
Allowance for doubtful accounts		(2,315	)		(512	)		(74	)
Total		1,075,456			1,205,924			173,689

Schedule of Analysis of Allowance for Doubtful Accounts

An analysis of the allowance for doubtful accounts is as follows:

	December 31,
	2015			2016
	RMB			RMB			US$
Beginning balance		335			2,315			333
Additions charged to bad debt expense		2,621			2,792			402
Reversal		(442	)		(489	)		(70	)
Write off		(199	)		(4,106	)		(591	)
Ending balance		2,315			512			74