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STOCKHOLDERS' EQUITY (Common Stock, 2018 Purchase Agreement and LP Purchase Agreement) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended
Jul. 01, 2019
USD ($)
shares
Apr. 30, 2019
USD ($)
shares
Apr. 25, 2019
Feb. 12, 2019
USD ($)
shares
Feb. 01, 2019
shares
Jan. 29, 2019
USD ($)
shares
Sep. 14, 2018
shares
Sep. 07, 2018
USD ($)
$ / shares
shares
Feb. 09, 2018
USD ($)
$ / shares
shares
Feb. 08, 2018
USD ($)
Aug. 09, 2019
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Mar. 31, 2019
shares
 [1]
Jun. 30, 2018
USD ($)
shares
Mar. 31, 2018
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Jan. 01, 2019
shares
Dec. 20, 2018
shares
Sep. 06, 2018
shares
Class of Stock [Line Items]                                            
Common stock, shares authorized (in shares)                       150,000,000       150,000,000   150,000,000 150,000,000 250,000,000 150,000,000  
Reverse stock split     15                                      
Conversion of convertible notes into common stock (in shares)       120,983                                    
Common stock, shares outstanding (in shares)                       5,993,369       5,993,369   2,298,738 5,993,369     1,543,724
Issuance of common stock, net of issuance costs | $                               $ 2,410,000 $ 618,000          
Conversion of convertible debt plus interest into common stock | $       $ 1,900,000                                    
Liability recorded related to equity purchase agreement repricing | $                               460,000 460,000          
Liability related to equity purchase agreement | $                                   $ 460,000        
Number of shares converted from debt instrument (in shares)       120,983                                    
Conversion of debt into stock | $       $ 1,900,000                                    
Liability for settlement of equity instrument | $                                   1,450,000        
Other current liabilities | $                                   1,910,000        
Proceeds from exercise of warrants | $                               $ 1,575,000 $ 1,092,000          
Common Stock                                            
Class of Stock [Line Items]                                            
Conversion of convertible notes into common stock (in shares)                       1,138,310 [1] 1,248,115 192,733     212,733          
Common stock issued for exercise of warrants                       310,200       310,200            
Common stock issued in connection with the conversion of convertible notes                       1,138,310       2,386,425            
Number of shares converted (in shares)                             (431,022)              
Conversion of convertible debt plus interest into common stock | $                       $ 4,100,000       $ 7,300,000            
Number of shares converted from debt instrument (in shares)                       1,138,310 [1] 1,248,115 192,733     212,733          
Conversion of debt into stock | $                       $ 4,100,000       $ 7,300,000            
Warrant exercises in period                       310,200   192,733   310,200 212,733          
Proceeds from exercise of warrants | $                           $ 900,000   $ 1,600,000 $ 1,100,000          
Leviston Resources LLC                                            
Class of Stock [Line Items]                                            
Proceeds from sale of stock | $                 $ 750,000                          
Proceeds from Issuance of Private Placement | $                 $ 750,000                          
Series B Preferred Stock                                            
Class of Stock [Line Items]                                            
Common stock issued on conversion of preferred shares                                 208,000          
Series C Preferred Stock [Member]                                            
Class of Stock [Line Items]                                            
Number of shares converted (in shares)                                 2,548          
Common stock issued on conversion of preferred shares                                 223,022          
Stock Not Issued, Shares                                 4,000          
Preferred Class B                                            
Class of Stock [Line Items]                                            
Number of shares converted (in shares)                                 2,340          
Common stock issued on conversion of preferred shares                                 208,000          
Subsequent Events                                            
Class of Stock [Line Items]                                            
Shares sold in offering (in shares) 100,000                                          
Issuance of common stock, net of issuance costs | $ $ 300,000                                          
Leviston Resources LLC                                            
Class of Stock [Line Items]                                            
Issuance costs | $                               $ 132,000            
Conversion of convertible notes into common stock (in shares)                       111,023       184,357            
Issuance of common stock for consulting services in connection with the merger (in shares)                 11,381                          
New shares issued (in shares)           10,000     48,076                          
Beneficial Ownership Cap           4.99%                                
Conversion of convertible debt plus interest into common stock | $                       $ 500,000       $ 700,000            
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                 $ 15.60                          
Stock Issued During Period, Shares, Issued for Services                 11,381                          
Stock Issued During Period, Value, Issued for Services | $                 $ 140,000                          
Accruals for potential obligations to the Investor | $                                   $ 700,000        
Number of shares converted from debt instrument (in shares)                       111,023       184,357            
Conversion of debt into stock | $                       $ 500,000       $ 700,000            
Leviston Resources LLC | Settled Litigation                                            
Class of Stock [Line Items]                                            
Issuance of convertible notes | $           $ 700,000                                
Lincoln Park [Member]                                            
Class of Stock [Line Items]                                            
New shares issued (in shares)         1,000,000   466,666 40,000                            
Value of shares issued | $               $ 10,000,000                            
Maximum percentage of shares issued               19.99%                            
Maximum number of shares issued               308,590                            
Beneficial Ownership Cap               4.99%                            
Shares sold in offering (in shares)   328,590                   240,000       998,076   328,590        
Issuance of common stock, net of issuance costs | $   $ 1,400,000                   $ 700,000       $ 2,400,000   $ 1,400,000 $ 4,100,000      
Share price (in dollars per share) | $ / shares               $ 7.05                            
Lincoln Park [Member] | Subsequent Events                                            
Class of Stock [Line Items]                                            
Shares sold in offering (in shares)                     100,000                      
Issuance of common stock, net of issuance costs | $                     $ 300,000                      
Minimum | Settled Litigation                                            
Class of Stock [Line Items]                                            
Issuance of common stock, net of issuance costs | $           $ 4,000,000                                
Minimum | Lincoln Park [Member]                                            
Class of Stock [Line Items]                                            
Share price (in dollars per share) | $ / shares               $ 1.50                            
Maximum | Lincoln Park [Member]                                            
Class of Stock [Line Items]                                            
Value of shares issued | $               $ 1,000,000               $ 10,000,000            
Shares sold in offering based on market price               36,666                            
Shares sold in offering (in shares)               30,000                            
[1] The common stock shares and additional paid-in capital for all periods presented reflect the one-for fifteen reverse stock split, which took effect on April 26, 2019.