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NET LOSS PER SHARE (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Equity Option        
NET LOSS PER SHARE (Details) [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 2,014,000 1,859,000 2,040,000 2,063,000