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DEFERRED REVENUE - Additional Information (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue Recognition and Deferred Revenue [Abstract]      
Deferred revenue revenue recognized ¥ 105,752 ¥ 50,951 ¥ 181,828