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CONVERTIBLE NOTES (Convertible Promissory Notes) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 16, 2019
USD ($)
shares
Feb. 12, 2019
USD ($)
shares
Jan. 29, 2019
USD ($)
installment
shares
Jan. 15, 2019
USD ($)
Feb. 09, 2018
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                  
Payments on notes             $ 329 $ 342  
Conversion of convertible debt plus interest into common stock   $ 1,900              
Number of shares converted from debt instrument (in shares) | shares   120,983              
Proceeds from issuance of common stock           $ 2,800 5,171 618  
Proceeds from issuance of debt             2,150 $ 3,000  
Crede Note                  
Debt Instrument [Line Items]                  
Conversion of convertible debt plus interest into common stock $ 1,450                
Number of shares converted from debt instrument (in shares) | shares 270,699                
Outstanding debt           0 0    
Issuance of convertible notes       $ 1,450          
Conversion price based on closing bid price of common stock on the date prior to each conversion date (as a percent)       90.00%          
Proceeds from issuance of common stock       $ 4,000          
Beneficial Ownership Cap       4.99%          
Leviston Resources LLC                  
Debt Instrument [Line Items]                  
Payments on notes           0      
Conversion of convertible debt plus interest into common stock           $ 0 $ 700    
Number of shares converted from debt instrument (in shares) | shares           0 184,357    
Outstanding debt           $ 0 $ 0    
Beneficial Ownership Cap     4.99%            
New shares issued (in shares) | shares     10,000   48,076        
Percentage of daily average composite trading volume     10.00%            
Leviston Resources LLC | Other current liabilities                  
Debt Instrument [Line Items]                  
Outstanding debt                 $ 500
Leviston Resources LLC | Accrued expenses                  
Debt Instrument [Line Items]                  
Outstanding debt                 $ 200
Settled Litigation | Leviston Resources LLC                  
Debt Instrument [Line Items]                  
Issuance of convertible notes     $ 700            
Number of equal monthly installments | installment     14            
Settled Litigation | Leviston Resources LLC | Crede Note | Accrued expenses                  
Debt Instrument [Line Items]                  
Issuance of convertible notes     $ 200            
Maximum | Crede Note                  
Debt Instrument [Line Items]                  
New shares issued (in shares) | shares             10,000    
Percentage of daily average composite trading volume             10.00%    
Maximum | Leviston Resources LLC                  
Debt Instrument [Line Items]                  
Payments on notes             $ 100    
Minimum | Settled Litigation                  
Debt Instrument [Line Items]                  
Proceeds from issuance of common stock     $ 4,000