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NET (LOSS) INCOME PER SHARE - Anti-Dilutive Awards Excluded from Calculation (Details) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 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 0
Restricted stock awards    
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share    
Number of securities excluded from calculation 0 0