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LOSS PER COMMON SHARE - Schedule of Antidilutive Securities (Details) - shares
shares in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities that were excluded from EPS (in shares) 6,763 6,424
Outstanding warrants on common stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities that were excluded from EPS (in shares) 118 290
Outstanding warrants on common stock | Common Stock Warrant    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities that were excluded from EPS (in shares) 3,556 3,556
Outstanding options and warrants issued to advisor    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities that were excluded from EPS (in shares) 600 600
Restricted stock unit awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities that were excluded from EPS (in shares) 1,188 371
Outstanding stock options awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities that were excluded from EPS (in shares) 1,301 1,607