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LEASES - Narratives (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
LEASES      
Operating Leases, Rent Expense, Sublease Rentals ¥ 1,199 ¥ 3,064 ¥ 4,131