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STOCKHOLDERS' EQUITY (Common Stock) (Details)
$ / shares in Units, security in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Sep. 14, 2018
shares
Sep. 07, 2018
USD ($)
$ / shares
shares
Feb. 09, 2018
USD ($)
$ / shares
shares
Jul. 31, 2017
shares
Jun. 30, 2018
security
$ / shares
Mar. 31, 2018
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Sep. 06, 2018
shares
Dec. 31, 2017
shares
Class of Stock [Line Items]                    
Common stock, shares authorized (in shares)             150,000,000     150,000,000
Common stock, shares outstanding (in shares)             23,755,872   23,155,872 10,196,620
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants | $               $ 487,000    
Number of shares to be issued due to repricing | security         3.0          
Liability recorded related to equity purchase agreement repricing | $             $ 460,000      
Debt converted | $             2,108,000      
Proceeds from exercise of warrants | $             1,271,000 $ 25,000    
Leviston Resources LLC [Member]                    
Class of Stock [Line Items]                    
Issuance costs | $             $ 132,000      
Common Stock [Member]                    
Class of Stock [Line Items]                    
Number of shares converted from debt instrument (in shares)             3,787,300      
Warrant exercises in period             3,787,300      
Proceeds from exercise of warrants | $             $ 1,300,000      
Common Stock [Member] | Bridge Loan                    
Class of Stock [Line Items]                    
Number of shares converted from debt instrument (in shares)       359,999            
Series B Preferred Stock [Member]                    
Class of Stock [Line Items]                    
Common stock issued on conversion of preferred shares             3,120,000      
Series C Preferred Stock                    
Class of Stock [Line Items]                    
Common stock issued on conversion of preferred shares             3,345,334      
Number of shares converted (in shares)             2,548      
Stock Not Issued, Shares             60,000      
Leviston Resources LLC [Member]                    
Class of Stock [Line Items]                    
New shares issued (in shares)     721,153              
Proceeds from sale of stock | $     $ 750,000              
Issuance of common stock for consulting services in connection with the merger (in shares)     170,711              
Equity Purchase Agreement | $     $ 8,000,000              
Equity Purchase Agreement, Commitment Fee Percentage     5.25%              
Equity Purchase Agreement, Commitment Fee Installment Percentage     1.75%              
Share price (in dollars per share) | $ / shares     $ 1.04              
Stock Issued During Period, Shares, Issued for Services     170,711              
Stock Issued During Period, Value, Issued for Services | $     $ 140,000              
Lincoln Park [Member]                    
Class of Stock [Line Items]                    
New shares issued (in shares) 7,000,000 600,000                
Value of shares issued | $   $ 10,000,000                
Shares sold in offering (in shares)             0      
Maximum percentage of shares issued   19.99%                
Maximum number of shares issued   4,628,859                
Share price (in dollars per share) | $ / shares   $ 0.47                
Beneficial Ownership Cap   4.99%                
Minimum [Member] | Lincoln Park [Member]                    
Class of Stock [Line Items]                    
Share price (in dollars per share) | $ / shares   $ 0.10                
Maximum [Member] | Lincoln Park [Member]                    
Class of Stock [Line Items]                    
Value of shares issued | $   $ 1,000,000                
Shares sold in offering (in shares)   450,000                
Shares sold in offering based on market price   550,000                
Purchase Agreement 2018 [Member] | Investor Shares [Member]                    
Class of Stock [Line Items]                    
Share price trigger | $ / shares         $ 0.30 $ 0.82        
Number of shares converted from debt instrument (in shares)             900,000      
Purchase Agreement 2018 [Member] | Minimum [Member] | Investor Shares [Member]                    
Class of Stock [Line Items]                    
Share price (in dollars per share) | $ / shares             $ 1.04