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PREPAID AND OTHER CURRENT ASSETS, NET (Schedule of Allowance for Doubtful Accounts) (Details) - CNY (¥) ¥ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Allowance for doubtful accounts:
Balance at beginning of year/Period	¥ (6,247)	¥ (2,993)
Written off	1,036	4,603
Balance at end of year/period	(7,213)	(6,247)
Prepaid and Other Current Assets
Allowance for doubtful accounts:
Balance at beginning of year/Period	(70)	(4,339)
Addition		(1,046)
Written off		5,315
Balance at end of year/period	¥ (70)	¥ (70)

X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

Amount of increase (decrease) in allowance for credit loss on accounts receivable.

+ References

Reference 1: 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=121599337&loc=SL82919249-210447

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- Definition

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

+ References

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- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

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