Prepayments and Other Current Assets, Net (Tables)

12 Months Ended

Dec. 31, 2022

Schedule of prepayments and other current assets, net

	As of December 31,
	2021			2022
	RMB			RMB			US$
Other receivables from advertisers		397,700			857,135			124,273
Advances to suppliers		108,263			137,419			19,924
Prepaid expenses		29,592			25,506			3,698
Inventories (i)		15,415			16,695			2,421
Receivable from third-party payment platform		16,785			51,014			7,396
Convertible loans		8,240			10,093			1,463
Others		104,324			72,371			10,493
Impairment of prepayments and inventory		(98,005	)		(102,145	)		(14,810	)
Allowance for credit losses		(102,985	)		(99,943	)		(14,490	)
Total		479,329			968,145			140,368

(i)Inventory consists of finished goods, as of December 31, 2021 and 2022, inventories net of impairment reserve were RMB265 and RMB4,283(US$621). For the years ended December 31, 2020, 2021 and 2022, the group recorded impairment reserve of RMB23,694, RMB7,618 and nil, respectively.

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		171,619			102,985			14,931
Amounts charged to expenses		(696	)		19,266			2,793
Amounts written off		(66,658	)		(27,623	)		(4,005	)
Disposal of a subsidiary		(1	)		—			—
Foreign Exchange effect		(1,279	)		5,315			771
Balance as of December 31		102,985			99,943			14,490