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ACCOUNTS RECEIVABLE, NET (Tables)

12 Months Ended

Dec. 31, 2015

ACCOUNTS RECEIVABLE, NET

Schedule of accounts receivable

		As of December 31,
		2014		2015
		RMB		RMB		US$
Accounts receivable		263,577		638,148		98,513
Allowance for doubtful accounts		(3,230	)	(17,592	)	(2,716	)

		260,347		620,556		95,797

Schedule of movement of the allowance for doubtful receivables

:

		As of December 31,
		2014		2015
		RMB		RMB		US$
Balance at the beginning of the year		72		3,230		499
Charged to general and administrative expenses		3,230		13,326		2,057
Additions in connection with business acquisition		—		729		113
Write-off during the year		(72	)	—		—
Foreign Exchange effect		—		307		47

Balance at the end of the year		3,230		17,592		2,716