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STOCK-BASED COMPENSATION - Schedule of Restricted Stock and Restricted Stock Units Activity (Details) - $ / shares
shares in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Restricted Shares    
Number of Shares    
Outstanding, beginning (shares) 207  
Granted (shares) 198 151
Vested (shares) (188)  
Cancelled (shares) (23)  
Outstanding, ending (shares) 194  
Weighted Average Granted Date Fair Value    
Outstanding, beginning (dollars per share) $ 5.28  
Granted (dollars per share) 2.00  
Vested (dollars per share) 3.93  
Cancelled (dollars per share) 4.68  
Outstanding, ending (dollars per share) $ 3.32  
Restricted Stock Units (RSUs)    
Number of Shares    
Outstanding, beginning (shares) 48  
Granted (shares) 29  
Vested (shares) (13)  
Outstanding, ending (shares) 64  
Weighted Average Granted Date Fair Value    
Outstanding, beginning (dollars per share) $ 5.08  
Granted (dollars per share) 2.00  
Vested (dollars per share) 8.11  
Outstanding, ending (dollars per share) $ 3.05