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TAXATION - Expiration Dates of Operating Loss Carryforward (Details)
¥ in Thousands
Dec. 31, 2020
CNY (¥)
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward ¥ 859,727
2021  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward 11,016
2022  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward 9,995
2023  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward 12,127
2024  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward 13,995
2025 and thereafter  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward ¥ 812,594