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CONVERTIBLE NOTES (Convertible Promissory Notes) (Details) $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 12, 2019 USD ($) shares | Jan. 29, 2019 USD ($) installment shares | Jan. 15, 2019 USD ($) | Feb. 09, 2018 shares | Mar. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Payments on notes |  |  |  |  | $ 109 |  | $ 116 |
Conversion of convertible debt plus interest into common stock | $ 1,900 |  |  |  |  | $ 200 |  |
Number of shares converted from debt instrument (in shares) | shares | 120,983 |  |  |  |  | 93,333 |  |
Long-term debt, net of current maturities |  |  |  |  | 238 | $ 253 |  | $ 253
Proceeds from issuance of common stock |  |  |  |  | 1,726 |  | $ 618 |
Proceeds from issuance of debt |  |  |  |  | 250 |  |  |
Crede Note |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Payments on notes |  |  |  |  | 0 |  |  |
Conversion of convertible debt plus interest into common stock |  |  |  |  | 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] |  |  |  |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  |  |  |  | $ 200 |  |  |
Number of shares converted from debt instrument (in shares) | shares |  |  |  |  | 73,333 |  |  | 0
Long-term debt, net of current maturities |  |  |  |  | $ 500 |  |  |
Beneficial Ownership Cap |  | 4.99% |  |  |  |  |  |
New shares issued (in shares) | shares |  | 10,000 |  | 48,076 |  |  |  |
Percentage of daily average composite trading volume |  | 10.00% |  |  |  |  |  |
Settled Litigation | Crede Note |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Issuance of convertible notes |  |  | $ 1,450 |  |  |  |  |
Settled Litigation | Leviston Resources LLC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Issuance of convertible notes |  | $ 700 |  |  |  |  |  |
Number of equal monthly installments | installment |  | 14 |  |  |  |  |  |
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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