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MAINLAND CHINA CONTRIBUTION PLAN (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
MAINLAND CHINA CONTRIBUTION PLAN      
Contribution for employee benefits ¥ 50,046 ¥ 44,598 ¥ 31,500