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ACQUISITION - Pro Forma Adjustments (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
ACQUISITION      
Pro forma net revenues ¥ 551,101 ¥ 673,941 ¥ 629,862
Pro forma net income/(loss) ¥ (60,143) ¥ (94,767) ¥ 44,947