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Accounts and notes receivable, net (Tables)

12 Months Ended

Dec. 31, 2021

Receivables [Abstract]

Schedule of Accounts Receivable

		As of December 31,
		2020				2021
		RMB				RMB				US$
Accounts and notes receivable			88,706				81,550				12,797
Less: allowance for doubtful accounts			(43,820	)			(37,690	)			(5,914	)
Total accounts and notes receivable, net			44,886				43,860				6,883

Schedule of Movement in Allowance for Doubtful Accounts

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

		As of December 31,
		2020				2021
		RMB				RMB				US$
Balance at beginning of year			28,516				43,820				6,876
Provisions			18,732				(246	)			(39	)
Write-offs			(3,428	)			(5,884	)			(923	)
Balance at end of year			43,820				37,690				5,914

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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 http://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 http://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 http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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