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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 |  |  |
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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.

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