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SHARE-BASED COMPENSATION - Expenses (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SHARE-BASED COMPENSATION      
Compensation expense ¥ 333,686 ¥ 189,756 ¥ 105,877
Cost of revenue      
SHARE-BASED COMPENSATION      
Compensation expense 89,943 46,007 18,008
Selling and marketing expenses      
SHARE-BASED COMPENSATION      
Compensation expense 54,204 39,436 25,213
General and administrative expenses      
SHARE-BASED COMPENSATION      
Compensation expense 184,943 101,949 61,707
Research and development expenses      
SHARE-BASED COMPENSATION      
Compensation expense ¥ 4,596 ¥ 2,364 ¥ 949