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NET (LOSS) INCOME PER SHARE - Anti-Dilutive Awards Excluded from Calculation (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Stock options        
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share        
Number of securities excluded from calculation 0   0  
Restricted stock units        
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share        
Number of securities excluded from calculation 0 3,857 0 12,263
Restricted stock awards        
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share        
Number of securities excluded from calculation 0   0