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STOCKHOLDERS' EQUITY (Common Stock, 2018 Purchase Agreement and LP Purchase Agreement) (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 25 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 14, 2020 | Jan. 01, 2020 | Aug. 09, 2019 | Feb. 01, 2019 | Jan. 29, 2019 | Sep. 14, 2018 | Sep. 07, 2018 | Aug. 10, 2018 | Feb. 12, 2018 | Feb. 09, 2018 | Feb. 08, 2018 | Feb. 11, 2020 | Jan. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 11, 2020 | Jan. 01, 2019 | Dec. 20, 2018 | Dec. 19, 2018 | Sep. 06, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 | 150,000,000 |  | 250,000,000 | 150,000,000 | 150,000,000 |
Conversion of convertible notes into common stock (in shares) |  |  |  |  |  |  |  |  | 120,983 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,898,117 | 2,298,738 |  |  |  |  | 1,543,724
Issuance of common stock, net of issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,628,000 | $ 2,008,000 |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  |  |  |  |  |  |  |  | $ 1,900,000 |  |  |  |  |  | 7,553,000 | 2,356,000 |  |  |  |  |
Share price (in dollars per share) |  |  |  |  |  |  |  |  | $ 15.60 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,000 |  |  |  |  |
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 |  |  |  |  |  | 7,553,000 | 2,356,000 |  |  |  |  |
Liability for settlement of equity instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,450,000 |  |  |  |  |
Other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,910,000 |  |  |  |  |
Proceeds from exercise of warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,575,000 | $ 1,271,000 |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,898,117 | 2,298,738 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes into common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,511,173 | 384,896 |  |  |  |  |
Number of shares converted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (431,022) |  |  |  |  |
Issuance of common stock for consulting services in connection with the merger (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,527 |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,527 |  |  |  |  |
Number of shares converted from debt instrument (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,511,173 | 384,896 |  |  |  |  |
Leviston Resources LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 132,000 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes into common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 310,200 | 252,486 |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,600,000 | $ 2,400,000 |  |  |  |  |
Number of shares converted from debt instrument (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 310,200 | 252,486 |  |  |  |  |
Conversion of debt into stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,600,000 | $ 2,400,000 |  |  |  |  |
Warrant exercises in period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 310,200 | 252,486 |  |  |  |  |
Proceeds from exercise of warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000 | $ 1,300,000 |  |  |  |  |
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 |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares sold in offering (in shares) |  | 900,012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leviston Resources LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of stock |  |  |  |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes into common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares sold in offering (in shares) |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 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) |  |  |  |  |  |  |  |  |  | $ 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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 184,357 |  |  |  |  |  |
Conversion of debt into stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,600,000 | $ 1,400,000 |  |  |  |  |
New shares issued (in shares) |  |  | 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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,778,077 | 328,590 |  |  |  |  |
Issuance of common stock, net of issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,600,000 | $ 1,400,000 |  |  |  |  |
Share price (in dollars per share) |  |  |  |  |  |  | $ 7.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,680,000 |  |  |  |  |  |
Lincoln Park [Member] | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of stock |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000 |  |  |  |  | $ 9,300,000 |  |  |  |
New shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 780,012 | 120,000 |  |  |  |  |  |  |
Shares sold in offering (in shares) |  |  |  |  |  |  |  |  |  |  |  | 900,012 |  |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs |  | $ 9,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lincoln Park [Member] | Subsequent Events | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New shares issued (in shares) | 920,654 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued on conversion of preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 208,000 |  |  |  |  |  |
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) |  |  |  |  |  |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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