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STOCKHOLDERS' EQUITY (Common Stock, 2018 Purchase Agreement and LP Purchase Agreement) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2019
USD ($)
shares
Apr. 25, 2019
Feb. 12, 2019
USD ($)
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 ($)
Jul. 31, 2017
shares
Apr. 30, 2019
USD ($)
shares
Mar. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Mar. 31, 2018
USD ($)
shares
Dec. 31, 2018
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  
Conversion of convertible notes into common stock (in shares)     120,983                 93,333            
Common stock, shares outstanding (in shares)                     4,304,929 2,298,738 2,298,738   2,298,738     1,543,724
Issuance of common stock, net of issuance costs | $                     $ 1,726,000     $ 618,000        
Liability recorded related to equity purchase agreement repricing | $                     $ 460,000              
Liability related to equity purchase agreement | $                       $ 460,000 $ 460,000   $ 460,000      
Number of shares converted from debt instrument (in shares)     120,983                 93,333            
Conversion of debt into stock | $     $ 1,900,000                 $ 200,000            
Liability for settlement of equity instrument | $                       1,450,000 1,450,000   1,450,000      
Other current liabilities | $                       1,910,000 1,910,000   $ 1,910,000      
Proceeds from exercise of warrants | $                           $ 225,000        
Common Stock                                    
Class of Stock [Line Items]                                    
Conversion of convertible notes into common stock (in shares)                     1,248,115 [1]       20,000      
Number of shares converted (in shares) [1]                           (431,022)        
Number of shares converted from debt instrument (in shares)                     1,248,115 [1]       20,000      
Warrant exercises in period                             20,000      
Proceeds from exercise of warrants | $                             $ 200,000      
Leviston Resources LLC                                    
Class of Stock [Line Items]                                    
Proceeds from sale of stock | $             $ 750,000                      
Proceeds from Issuance of Private Placement | $             $ 750,000                      
Common Stock | Bridge Loan                                    
Class of Stock [Line Items]                                    
Conversion of convertible notes into common stock (in shares)                 23,999                  
Number of shares converted from debt instrument (in shares)                 23,999                  
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                           223,022 223,022      
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]                                    
Reverse stock split   15                                
Leviston Resources LLC                                    
Class of Stock [Line Items]                                    
Issuance costs | $                     $ 132,000              
Conversion of convertible notes into common stock (in shares)                     73,333       0      
Issuance of common stock for consulting services in connection with the merger (in shares)             11,380                      
New shares issued (in shares)       10,000     48,076                      
Beneficial Ownership Cap       4.99%                            
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             11,380                      
Stock Issued During Period, Value, Issued for Services | $             $ 140,000                      
Accruals for potential obligations to the Investor | $                       $ 700,000 $ 700,000   $ 700,000      
Number of shares converted from debt instrument (in shares)                     73,333       0      
Conversion of debt into stock | $                     $ 200,000              
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)         466,666 40,000                 1,000,000      
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)                     758,076   328,590          
Issuance of common stock, net of issuance costs | $                     $ 1,700,000   $ 1,400,000          
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) 328,590                 240,000                
Issuance of common stock, net of issuance costs | $ $ 1,400,000                 $ 700,000                
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.