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LEASES - Consolidated income statement (Details) - CNY (¥)
¥ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Statement Line Items    
Depreciation charge of right-of-use assets ¥ 163 ¥ 635
Income Statement Locations    
Statement Line Items    
Depreciation charge of right-of-use assets 6,564 7,035
Interest expense ¥ 753 ¥ 1,094