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SHARE-BASED COMPENSATION - Expenses (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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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

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