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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Narrative) (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 15, 2019 | Mar. 12, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 29, 2019 | Feb. 12, 2018 | Jun. 29, 2017
Reduction in Certain Accrued Expense and Accounts Payable |  |  | $ 300 | $ 1,100 |  |  |
Settlement liability |  |  |  | 1,100 |  |  |
Common stock warrant liabilities |  |  | 1,132 | 841 |  |  |
Warrants, fair value |  |  |  |  |  |  | $ 211
Gain in warrant revaluation |  |  | 200 |  |  |  |
Gain (loss) on settlement of equity instrments |  |  | 263 | 877 |  |  |
Proceeds from issuance of convertible notes |  |  | 3,850 | 1,365 |  |  |
Liability related to equity purchase agreement |  |  | 460 |  |  |  |
Other current liabilities |  |  |  |  |  |  |
Liability related to equity purchase agreement |  |  | 500 |  |  |  |
Crede |  |  |  |  |  |  |
Liability For Settlement Common Shares Issued |  |  |  |  |  | 1,814,754 |
Liability For Settlement Fair Value Of Common Shares Issued |  |  |  |  |  | $ 1,900 |
Loss Contingency, Damages Sought, Value |  |  | 2,200 |  |  |  |
Settlement liability |  |  | 1,500 |  |  |  |
Common stock warrant liabilities |  |  | 400 | $ 600 |  |  |
Warrants, fair value |  |  | 400 |  |  |  |
Gain (loss) on settlement of equity instrments |  |  | $ (400) |  |  |  |
Subsequent Events | Crede |  |  |  |  |  |  |
Issuance of convertible notes | $ 1,450 |  |  |  |  |  |
Subsequent Events | Crede | Minimum |  |  |  |  |  |  |
Proceeds from issuance of convertible notes | 4,000 |  |  |  |  |  |
Settled Litigation | Crede |  |  |  |  |  |  |
Litigation Settlement, Amount Awarded to Other Party |  | $ 1,925 |  |  |  |  |
Liability For Settlement Payment Period |  |  | 16 months |  |  |  |
Settlement payable |  |  | $ 400 |  |  |  |
Damages paid |  |  | $ 500 |  |  |  |
Settled Litigation | Subsequent Events | Crede |  |  |  |  |  |  |
Issuance of convertible notes | $ 1,450 |  |  |  |  |  |
Settled Litigation | Subsequent Events | Leviston Resources LLC |  |  |  |  |  |  |
Issuance of convertible notes |  |  |  |  | $ 700 |  |
Settled Litigation | Subsequent Events | Leviston Resources LLC | Crede |  |  |  |  |  |  |
Issuance of convertible notes |  |  |  |  | 700 |  |
Settled Litigation | Subsequent Events | Leviston Resources LLC | Crede | Accrued expenses |  |  |  |  |  |  |
Issuance of convertible notes |  |  |  |  | $ 200 |  |

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