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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, 2019
Sep. 30, 2018
Restricted Shares    
Number of Shares    
Outstanding, beginning (shares) 120  
Granted (shares) 151 90
Vested (shares) (58)  
Cancelled (shares) (7)  
Outstanding, ending (shares) 206  
Weighted Average Granted Date Fair Value    
Outstanding, beginning (dollars per share) $ 8.77  
Granted (dollars per share) 3.93  
Vested (dollars per share) 8.91  
Cancelled (dollars per share) 5.97  
Outstanding, ending (dollars per share) $ 5.28  
Restricted Stock Units (RSUs)    
Number of Shares    
Outstanding, beginning (shares) 43  
Granted (shares) 36  
Vested (shares) (30)  
Outstanding, ending (shares) 49  
Weighted Average Granted Date Fair Value    
Outstanding, beginning (dollars per share) $ 9.26  
Granted (dollars per share) 3.93  
Vested (dollars per share) 9.76  
Outstanding, ending (dollars per share) $ 5.05