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NET INCOME (LOSS) PER SHARE - Anti-Dilutive Awards Excluded from Calculation (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share        
Weighted average number of securities excluded from calculation 3,857 538,687 12,263,000 602,603,000
Stock options        
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share        
Weighted average number of securities excluded from calculation   87,497   87,497,000
Restricted stock units        
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share        
Weighted average number of securities excluded from calculation 3,857 451,190 12,263,000 498,704,000
Restricted stock awards        
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share        
Weighted average number of securities excluded from calculation       16,402,000