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STOCK-BASED COMPENSATION - Schedule of Restricted Stock and Restricted Stock Units Activity (Details) - $ / shares
shares in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Restricted Shares    
Number of Shares    
Outstanding, beginning (in shares) 193  
Granted (in shares) 106 198
Vested (in shares) (88)  
Cancelled (in shares) (4)  
Outstanding, ending (in shares) 207  
Weighted Average Granted Date Fair Value    
Outstanding, beginning (in dollars per share) $ 3.32  
Granted (in dollars per share) 4.25  
Vested (in dollars per share) 3.99  
Cancelled (in dollars per share) 2.80  
Outstanding, ending (in dollars per share) $ 3.51  
RSU's    
Number of Shares    
Outstanding, beginning (in shares) 55  
Granted (in shares) 37  
Vested (in shares) (26)  
Outstanding, ending (in shares) 66  
Weighted Average Granted Date Fair Value    
Outstanding, beginning (in dollars per share) $ 2.92  
Granted (in dollars per share) 4.25  
Vested (in dollars per share) 3.93  
Outstanding, ending (in dollars per share) $ 3.27