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PREPAID AND OTHER CURRENT ASSETS, NET (Schedule of Allowance for Doubtful Accounts) (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts:
Balance at beginning of year	¥ (2,993)	¥ (3,535)
Written off	4,603	3,762
Balance at end of year	(6,247)	(2,993)
Prepaid and Other Current Assets
Allowance for doubtful accounts:
Balance at beginning of year	(4,339)	(9,654)
Addition	(1,046)	(2,765)
Written off	5,315	8,080
Balance at end of year	¥ (70)	¥ (4,339)

X

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Amount of allowance for credit loss on accounts receivable.

+ References

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- Definition

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

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- Definition

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

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