
	As of
	December 31, 2021			June 30, 2022
	RMB			RMB			US$
Accounts receivable		81,550			61,728			9,216
Less: allowance for doubtful accounts		(37,690	)		(26,590	)		(3,970	)

Total accounts receivable, net		43,860			35,138			5,246

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


	As of
	December 31, 2021			June 30, 2022
	RMB			RMB			US$
Balance at beginning of the period		43,820			37,690			5,627
Provisions/(reversals)		(246	)		1,669			249
Write-offs		(5,884	)		(12,769	)		(1,906	)

Balance at end of the period		37,690			26,590			3,970