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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)