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CONVERTIBLE NOTES (Convertible Promissory Notes) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 15, 2019 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Apr. 16, 2019 | Jan. 29, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Payments on notes |  |  | $ 284,000 | $ 231,000 |  |  |
Conversion of interest on convertible debt into common stock |  |  | 1,938,000 | 7,272,000 |  |  |
Proceeds from issuance of common stock |  |  | 2,607,000 | 2,410,000 |  |  |
Proceeds from issuance of debt |  |  |  | 2,150,000 |  |  |
Leviston Note [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Outstanding debt |  |  | $ 0 |  | $ 0 |  |
Crede Note |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Payments on notes |  | $ 0 |  | 0 |  |  |
Number of shares converted from debt instrument (in shares) |  |  | 270,699 |  | 270,699 |  |
Outstanding debt |  |  | $ 0 |  |  | $ 1,450,000 |
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] |  |  |  |  |  |  |
Payments on notes |  | 0 |  |  |  |  |
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 |  |  |
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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