Accounts Receivable, Net

12 Months Ended

Dec. 31, 2019

Receivables [Abstract]

ACCOUNTS RECEIVABLE, NET

6. ACCOUNTS RECEIVABLE, NET

	As of December 31,
	2018			2019			2019
	RMB			RMB			US$
Accounts receivable		2,984,090			3,772,323			541,860
Allowance for doubtful accounts		(94,856	)		(144,574	)		(20,766	)
Accounts receivable, net		2,889,234			3,627,749			521,094

The following table presents movement of the allowance for doubtful accounts: 

	As of December 31,
	2017			2018			2019			2019
	RMB			RMB			RMB			US$
Balance at the beginning of the year		19,719			24,686			94,856			13,625
Provisions		56,048			85,745			72,259			10,379
Write-offs		(51,081	)		(15,575	)		(22,541	)		(3,238	)
Balance at the end of the year		24,686			94,856			144,574			20,766