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CONVERTIBLE NOTES (Convertible Promissory Notes) (Details)
$ in Thousands
12 Months Ended
Apr. 16, 2019
USD ($)
shares
Jan. 29, 2019
USD ($)
installment
shares
Jan. 15, 2019
USD ($)
Feb. 12, 2018
USD ($)
shares
Feb. 09, 2018
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]              
Payments on notes           $ 473 $ 422
Conversion of convertible debt plus interest into common stock       $ 1,900   7,553 2,356
Number of shares converted from debt instrument (in shares) | shares       120,983      
Outstanding debt           543  
Proceeds from issuance of common stock           6,628 2,008
Proceeds from issuance of debt           2,150 3,850
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  
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]              
Conversion of convertible debt plus interest into common stock           $ 700  
Number of shares converted from debt instrument (in shares) | shares           184,357  
Outstanding debt           $ 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