As of December 31,
		2016			2017
		RMB			RMB
Accounts receivable			476,611			730,486
Allowance for doubtful accounts			(51,719)			(62,736)
Accounts receivable, net			424,892			667,750

Movement of allowance for doubtful accounts is as follows:

 

		As of December 31,
		2016			2017
		RMB			RMB
Balance at beginning of year			38,214			51,719
Provisions			14,694			16,450
Reversals			(957)			(4,896)
Write-offs			(232)			(537)
Balance at end of year			51,719			62,736