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SHARE-BASED AWARDS - Summary of RSU activity (Details) - RSU - $ / shares
1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Aug. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Number of RSUs        
Unvested at the beginning     14,070,000 564,000
Granted 2,160,000 2,160,000 8,592,000 13,901,000
Forfeited     (3,000,000) (395,000)
Vested and outstanding at the end 19,662,000   19,662,000  
Unvested at the end 0   0 14,070,000
Weighted-Average Grant-Date Fair Value        
Unvested at the beginning (in dollars per share)     $ 6.80 $ 4.88
Granted (in dollars per share)     7.60 6.87
Forfeited (in dollars per share)     6.99 6.71
Unvested at the end (in dollars per share) $ 7.12   7.12 $ 6.80
Vested and outstanding at the end (in dollars per share) $ 0   $ 0