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BASIC AND DILUTED NET (LOSS)/INCOME PER SHARE - Antidilutive Securities Excluded from Computation of Earnings Per Share (Details)
6 Months Ended
Jun. 30, 2021
shares
Preferred shares  
BASIC AND DILUTED NET (LOSS)/INCOME PER SHARE  
Antidilutive securities excluded from computation of earnings per share amount 502,881,617
Share options and RSUs  
BASIC AND DILUTED NET (LOSS)/INCOME PER SHARE  
Antidilutive securities excluded from computation of earnings per share amount 94,100,191