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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)

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