Accounts receivable, net (Tables)

12 Months Ended

Dec. 31, 2017

Accounts receivable, net [Abstract]

Schedule of accounts receivable, net

	December 31,
	2016		2017
	RMB		RMB
Accounts receivable, gross		224,791		161,300
Less: allowance for doubtful receivables		(55,220)		(7,356)
Accounts receivable, net		169,571		153,944

Summary of allowance for doubtful accounts

	For the year ended December 31,
	2015		2016		2017
	RMB		RMB		RMB
Balance at the beginning of the year		(57,342)		(58,791)		(55,220)
(Additions) reversals charged to general and administrative expenses, net		(1,449)		3,571		(3,049)
Write-off during the year		-		-		50,913
Balance at the end of the year		(58,791)		(55,220)		(7,356)