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Accounts receivable, net (Tables)

12 Months Ended

Dec. 31, 2022

Receivables [Abstract]

Schedule of Accounts Receivable

		As of December 31,
		2021				2022
		RMB				RMB				US$
Accounts receivable			81,550				34,869				5,056
Less: allowance for doubtful accounts			(37,690	)			(5,142	)			(746	)
Total accounts receivable, net			43,860				29,727				4,310

Schedule of Movement in Allowance for Doubtful Accounts

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

		As of December 31,
		2021				2022
		RMB				RMB				US$
Balance at beginning of year			43,820				37,690				5,465
(Reversals)/provisions			(246	)			2,089				303
Write-offs			(5,884	)			(34,637	)			(5,022	)
Balance at end of year			37,690				5,142				746

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- References

No definition available.

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- Definition

Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3,4)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Tabular disclosure of allowance for credit loss of financing receivable, classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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