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STOCKHOLDERS' EQUITY (Common Stock) (Details) $ / shares in Units, security in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 09, 2018 USD ($) $ / shares shares | Jul. 31, 2017 shares | Jun. 30, 2018 USD ($) security $ / shares shares | Mar. 31, 2018 $ / shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017 shares | Jun. 30, 2016 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  |  | 150,000,000 |  | 150,000,000 |  | 150,000,000 |
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants |  |  |  |  |  | $ 414,000 |  |
Number of shares to be issued due to repricing | security |  |  | 3.0 |  |  |  |  |
Liability recorded related to equity purchase agreement repricing |  |  |  |  | $ 460,000 |  |  |
Liability related to equity purchase agreement |  |  | $ 460,000 |  | 460,000 |  |  | $ 460,000
Debt converted |  |  |  |  | 164,000 |  |  |
Proceeds from exercise of warrants |  |  |  |  | 1,092,000 | $ 25,000 |  |
Leviston Resources LLC [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance costs | $ 6,000 |  |  |  | $ 136,000 |  |  |
Common Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) | shares |  |  |  |  | 3,191,000 |  |  |
Warrant exercises in period | shares |  |  |  |  | 3,191,000 |  |  |
Proceeds from exercise of warrants |  |  |  |  | $ 1,100,000 |  |  |
Common Stock | Bridge Loan |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) | shares |  | 359,999 |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock issued on conversion of preferred shares | shares |  |  |  |  | 3,120,000 |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock issued on conversion of preferred shares | shares |  |  |  |  | 3,345,334 |  |  |
Number of shares converted (in shares) | shares |  |  |  |  | 2,548 |  |  |
Stock Not Issued, Shares | shares |  |  |  |  | 60,000 |  |  |
Leviston Resources LLC [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock purchase fee | 0.75% |  |  |  |  |  |  |
Proceeds from sale of stock | $ 744,000 |  |  |  |  |  |  |
Issuance of common stock for consulting services in connection with the merger (in shares) | 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% |  |  |  |  |  |  |
Equity Purchase Agreement, Fee | $ 35,000 |  |  |  |  |  |  |
Equity Purchase Agreement, Fee, Contingent Discount | 15,000 |  |  |  |  |  |  |
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants | $ 721,153 |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares | $ 1.04 |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement | $ 744,000 |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services | shares | 170,711 |  |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Services | $ 140,000 |  |  |  |  |  |  |
Company stock percentage of market rate | 97.25% |  |  |  |  |  |  |
Potential liquidation damage amount to each occurrence of default related to the purchase agreement | $ 100,000 |  |  |  |  |  |  |
Purchase Agreement 2018 [Member] | Investor Shares [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share price trigger | $ / shares |  |  | $ 0.30 | $ 0.82 |  |  |  |
Stock Not Issued, Shares | shares |  |  | 2,100,000 |  |  |  |  |
Number of shares converted from debt instrument (in shares) | 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 |  | $ 1.04 |  |  |

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