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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 | 30 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 26, 2020 shares | May 13, 2020 USD ($) shares | Apr. 08, 2020 shares | Mar. 26, 2020 USD ($) D $ / shares shares | Jan. 14, 2020 shares | Aug. 09, 2019 shares | Feb. 01, 2019 shares | Sep. 14, 2018 shares | Sep. 07, 2018 USD ($) $ / shares shares | Apr. 30, 2020 | Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Jun. 30, 2020 USD ($) shares | Apr. 06, 2020 shares | Jan. 29, 2019 USD ($) | 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 |
Common stock, shares outstanding (in shares) |  |  |  | 8,870,129 |  |  |  |  |  |  | 14,616,916 |  | 14,616,916 |  | 7,898,117 |  | 14,616,916 |  |  |  |  | 1,543,724
Shares sold in offering (in shares) |  | 1,810,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,607,000 | $ 2,410,000 |  |  |  |  |  |  |  |
Conversion of interest on convertible debt into common stock | $ |  |  |  |  |  |  |  |  |  |  |  |  | 1,938,000 | 7,272,000 |  |  |  |  |  |  |  |
Conversion of debt into stock | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,938,000 | 7,272,000 |  |  |  |  |  |  |  |
Proceeds from exercise of warrants | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,575,000 |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  |  |  |  |  |  | 14,616,916 |  | 14,616,916 |  | 7,898,117 |  | 14,616,916 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes into common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 3,480,148 | 1,138,310 | 3,908,145 | 2,386,425 |  |  |  |  |  |  |  |
Common stock issued in connection with the conversion of convertible notes |  |  |  |  |  |  |  |  |  |  | 3,480,148 |  | 3,908,145 |  |  |  |  |  |  |  |  |
Conversion of interest on convertible debt into common stock | $ |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 | $ 4,100,000 | $ 2,200,000 | $ 7,300,000 |  |  |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) |  |  |  |  |  |  |  |  |  |  | 3,480,148 | 1,138,310 | 3,908,145 | 2,386,425 |  |  |  |  |  |  |  |
Conversion of debt into stock | $ |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 | $ 4,100,000 | $ 2,200,000 | $ 7,300,000 |  |  |  |  |  |  |  |
Preferred Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares converted (in shares) |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |
Leviston Resources LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes into common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  | 111,023 |  | 184,357 |  |  |  |  |  |  |  |
Conversion of interest on convertible debt into common stock | $ |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  | $ 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) | 4,500,000 |  |  |  | 920,654 | 1,800,000 | 1,000,000 | 466,667 | 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) |  | 3,330,000 |  |  |  |  |  |  |  |  | 110,642 |  | 1,040,654 |  | 2,778,077 | 328,590 |  |  |  |  |  |
Issuance of common stock, net of issuance costs | $ |  | $ 3,700,000 |  |  |  |  |  |  |  |  | $ 100,000 |  | $ 1,400,000 |  | $ 6,600,000 | $ 1,400,000 | $ 9,400,000 |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 7.05 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 920,654 |  |  |  |
Minimum | Lincoln Park [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  | $ 1.50 |  |  |  |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |
LP 2020 Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,900,000 |  |  |  |  |  |  |  |  |
LP 2020 Purchase Agreement [Member] | Lincoln Park [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New shares issued (in shares) |  |  | 1,770,000 | 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued | $ |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of shares issued |  |  |  | 19.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares issued |  |  |  | 1,774,024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial Ownership Cap |  |  |  |  |  |  |  |  |  | 4.99% |  |  |  |  |  |  |  |  |  |  |  |
Shares sold in offering (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,520,000 |  |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  | $ 0.7306 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business days prior to purchase date | D |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LP 2020 Purchase Agreement [Member] | Minimum | Lincoln Park [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LP 2020 Purchase Agreement [Member] | Maximum | Lincoln Park [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares issued | $ |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares sold in offering based on market price |  |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LP 2020 Purchase Agreement [Member] | Closing Sale Price Above 1.00 [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares sold in offering based on market price |  |  |  | 80,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LP 2020 Purchase Agreement [Member] | Closing Sale Price Above 1.50 [Member] | Maximum | Lincoln Park [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares sold in offering based on market price |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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