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Summary of Principal Accounting Policies - Allowance for Doubtful Accounts (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)
Allowance for doubtful accounts
Balance at beginning of the year	¥ 0
Provisions	112,959	$ 17,726	¥ 8,083	¥ 130,723
Write off	10,800
Balance at end of the year	458		0
Amount Due From Related Party
Allowance for doubtful accounts
Balance at beginning of the year	4,006
Provisions	26,122		4,006	14,602
Write off				(14,602)
Balance at end of the year	30,128		4,006
Accounts Receivable
Allowance for doubtful accounts
Provisions	458		29	11,858
Write off			¥ (29)	(11,858)
Balance at end of the year	458
Loan Receivables From Factoring Business
Allowance for doubtful accounts
Provisions				82,000
Write off				(82,000)
Other Financial Receivables
Allowance for doubtful accounts
Provisions	4,000			16,912
Write off				(16,912)
Balance at end of the year	¥ 4,000
Camsing Incident | Amount Due From Related Party
Allowance for doubtful accounts
Provisions				¥ 12,800

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of receivables that have been written off from both receivables and allowance reserve for credit loss.

+ References

No definition available.

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- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(5))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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