Accounts Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2022

Schedule of accounts receivable

	As of December 31,
	2021			2022
	RMB			RMB			US$
Accounts receivable		263,000			385,935			55,955
Allowance for credit losses		(92,695	)		(102,161	)		(14,812	)
Accounts receivable, net		170,305			283,774			41,143

Schedule of movement in the allowance for credit losses

The movements in the allowance for credit losses were as follows:

	Year ended December 31,
	2021			2022
	RMB			RMB		USD
Balance as of January 1		100,020			92,695		13,440
Amounts charged to expenses		(1,462	)		3,156		458
Amounts written off		(3,951	)		—		—
Foreign Exchange effect		(1,912	)		6,310		914
Balance as of December 31		92,695			102,161		14,812