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CONVERTIBLE NOTES (Convertible Promissory Notes) (Details) $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 16, 2019 USD ($) shares | Feb. 12, 2019 USD ($) shares | Jan. 29, 2019 USD ($) installment shares | Jan. 15, 2019 USD ($) | Feb. 09, 2018 shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Payments on notes |  |  |  |  |  |  | $ 231 | $ 196 |
Conversion of convertible debt plus interest into common stock |  | $ 1,900 |  |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) | shares |  | 120,983 |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  | 2,410 | 618 |
Proceeds from issuance of debt |  |  |  |  |  |  | 2,150 | $ 1,660 |
Crede Note |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Payments on notes |  |  |  |  |  | $ 0 | 0 |  |
Conversion of convertible debt plus interest into common stock | $ 1,450 |  |  |  |  |  |  |  |
Number of shares converted from debt instrument (in shares) | shares | 270,699 |  |  |  |  |  |  |  |
Outstanding debt |  |  |  |  |  | 0 | 0 |  |
Issuance of convertible notes |  |  |  | $ 1,450 |  |  |  |  |
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 |  |  |  |  |
Beneficial Ownership Cap |  |  |  | 4.99% |  |  |  |  |
Leviston Resources LLC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Payments on notes |  |  |  |  |  | 0 |  |  |
Conversion of convertible debt plus interest into common stock |  |  |  |  |  | $ 500 | $ 700 |  |
Number of shares converted from debt instrument (in shares) | shares |  |  |  |  |  | 111,023 | 184,357 |  |
Outstanding debt |  |  |  |  |  | $ 0 | $ 0 |  |
Beneficial Ownership Cap |  |  | 4.99% |  |  |  |  |  |
New shares issued (in shares) | shares |  |  | 10,000 |  | 48,076 |  |  |  |
Percentage of daily average composite trading volume |  |  | 10.00% |  |  |  |  |  |
Leviston Resources LLC | Other current liabilities |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Outstanding debt |  |  |  |  |  |  |  |  | $ 500
Leviston Resources LLC | Accrued expenses |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Outstanding debt |  |  |  |  |  |  |  |  | $ 200
Settled Litigation | Leviston Resources LLC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Issuance of convertible notes |  |  | $ 700 |  |  |  |  |  |
Number of equal monthly installments | installment |  |  | 14 |  |  |  |  |  |
Settled Litigation | Leviston Resources LLC | Crede Note | Accrued expenses |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Issuance of convertible notes |  |  | $ 200 |  |  |  |  |  |
Maximum | Crede Note |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
New shares issued (in shares) | shares |  |  |  |  |  |  | 10,000 |  |
Percentage of daily average composite trading volume |  |  |  |  |  |  | 10.00% |  |
Maximum | Leviston Resources LLC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Payments on notes |  |  |  |  |  |  | $ 100 |  |
Minimum | Settled Litigation |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 4,000 |  |  |  |  |  |

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