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CONVERTIBLE NOTES (Convertible Promissory Notes) (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 16, 2019 | Jan. 15, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 29, 2019
Debt Instrument [Line Items] |  |  |  |  |
Payments on notes |  |  | $ 322,000 | $ 473,000 |
Conversion of convertible debt, plus interest, into common stock |  |  | 2,176,000 | 7,553,000 |
Outstanding debt |  |  | 1,032,000 |  |
Proceeds from issuance of common stock |  |  | 8,929,000 | 6,628,000 |
Proceeds from issuance of debt |  |  |  | 2,150,000 |
Crede Note |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Conversion of convertible debt, plus interest, into common stock | $ 1,450,000 |  |  |  |
Number of shares converted from debt instrument (in shares) | 270,699 |  |  |  |
Outstanding debt |  |  | 0 | 0 |
Issuance of convertible notes |  | $ 1,450,000 |  |  |
Conversion price based on closing bid price of common stock on the date prior to each conversion date (as a percent) |  | 90.00% |  |  |
Proceeds from issuance of common stock |  | $ 4,000,000 |  |  |
Beneficial Ownership Cap |  | 4.99% |  |  |
Leviston Resources LLC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Conversion of convertible debt, plus interest, into common stock |  |  |  | $ 700,000 |
Number of shares converted from debt instrument (in shares) |  |  |  | 184,357 |
Outstanding debt |  |  | $ 0 | $ 0 |
Settled Litigation | Leviston Resources LLC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance of convertible notes |  |  |  |  | $ 700,000
Maximum | Crede Note |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
New shares issued (in shares) |  |  | 10,000 |  |
Percentage of daily average composite trading volume |  |  | 10.00% |  |
Maximum | Leviston Resources LLC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Payments on notes |  |  |  | $ 100,000 |

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