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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 | 27 Months Ended |  |  |  |
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Apr. 08, 2020 shares | Apr. 06, 2020 USD ($) shares | Mar. 26, 2020 USD ($) 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 | May 13, 2020 USD ($) shares | Apr. 30, 2020 shares | Mar. 31, 2020 USD ($) shares | Mar. 31, 2019 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Mar. 31, 2020 USD ($) 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 |  | 250,000,000 | 150,000,000 |
Common stock, shares outstanding (in shares) |  |  | 8,870,129 |  |  |  |  |  |  |  | 9,506,126 |  | 7,898,117 |  | 9,506,126 |  |  |  | 1,543,724
Issuance of common stock, net of issuance costs | $ |  |  |  |  |  |  |  |  |  |  | $ 1,350,000 | $ 1,726,000 |  |  |  |  |  |  |
Conversion of interest on convertible debt into common stock | $ |  |  |  |  |  |  |  |  |  |  | 325,000 | 2,933,000 |  |  |  |  |  |  |
Conversion of debt into stock | $ |  |  |  |  |  |  |  |  |  |  | $ 325,000 | $ 2,933,000 |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  |  |  |  |  |  | 9,506,126 |  | 7,898,117 |  | 9,506,126 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes into common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 427,997 | 1,248,115 |  |  |  |  |  |  |
Common stock issued in connection with the conversion of convertible notes |  |  |  |  |  |  |  |  |  |  | 427,997 | 1,248,115 |  |  |  |  |  |  |
Conversion of interest on convertible debt into common stock | $ |  |  |  |  |  |  |  |  |  |  | $ 400,000 | $ 3,100,000 |  |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) |  |  |  |  |  |  |  |  |  |  | 427,997 | 1,248,115 |  |  |  |  |  |  |
Conversion of debt into stock | $ |  |  |  |  |  |  |  |  |  |  | $ 400,000 | $ 3,100,000 |  |  |  |  |  |  |
Preferred Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares converted (in shares) |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |
Leviston Resources LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes into common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 73,333 |  | 111,024 |  |  |  |  |  |
Conversion of interest on convertible debt into common stock | $ |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  | $ 500,000 |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) |  |  |  |  |  |  |  |  |  |  | 73,333 |  | 111,024 |  |  |  |  |  |
Conversion of debt into stock | $ |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  | $ 500,000 |  |  |  |  |  |
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) |  |  |  | 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) |  | 110,640 |  |  |  |  |  |  | 500,000 |  | 930,012 |  | 2,778,077 | 328,590 |  |  |  |  |
Issuance of common stock, net of issuance costs | $ |  | $ 100,000 |  |  |  |  |  |  | $ 300,000 |  | $ 1,300,000 |  | $ 6,600,000 | $ 1,400,000 | $ 9,400,000 |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 7.05 |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  |  |  |  |  | 110,642 | 810,012 |  |  |  | 810,012 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs | $ |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  | $ 0.7306 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  |
Number of business days prior to purchase date | D |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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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