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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 |  |  |

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