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STOCK BASED COMPENSATION - Summary of Stock Options Outstanding and Exercisable by Stock Option Plan (Details) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding Stock Options, Number of Outstanding Stock Options 185,054 37,786 19,170
Outstanding Stock Options, Weighted Average Exercise Price $ 7.70 $ 37.42 $ 80.00
Exercisable Stock Options, Number of Exercisable Stock Options 35,253 37,786  
Exercisable Stock Options, Weighted Average Exercise Price $ 33.37 $ 37.42  
2004 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding Stock Options, Number of Outstanding Stock Options 92    
Outstanding Stock Options, Weighted Average Exercise Price $ 1,638.00    
Exercisable Stock Options, Number of Exercisable Stock Options 92    
Exercisable Stock Options, Weighted Average Exercise Price $ 1,638.00    
2004 Directors Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding Stock Options, Number of Outstanding Stock Options 3    
Outstanding Stock Options, Weighted Average Exercise Price $ 10,380.00    
Exercisable Stock Options, Number of Exercisable Stock Options 3    
Exercisable Stock Options, Weighted Average Exercise Price $ 10,380.00    
2013 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding Stock Options, Number of Outstanding Stock Options 158,962    
Outstanding Stock Options, Weighted Average Exercise Price $ 6.57    
Exercisable Stock Options, Number of Exercisable Stock Options 33,158    
Exercisable Stock Options, Weighted Average Exercise Price $ 25.47    
2020 Inducement Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding Stock Options, Number of Outstanding Stock Options 23,997    
Outstanding Stock Options, Weighted Average Exercise Price $ 2.08    
Replacement Options - Alabama Graphite      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding Stock Options, Number of Outstanding Stock Options 2,000    
Outstanding Stock Options, Weighted Average Exercise Price $ 75.08    
Exercisable Stock Options, Number of Exercisable Stock Options 2,000