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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 12, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 29, 2019 | Jan. 15, 2019
Reduction in Certain Accrued Expense and Accounts Payable |  | $ 1,400 | $ 300 |  |
Common stock warrant liabilities |  | 1,338 | 1,132 |  |
Gain in warrant revaluation |  | 200 |  |  |
Gain (loss) on settlement of equity instruments |  | 1,437 | 263 |  |
Proceeds from convertible notes |  | 2,150 | 3,850 |  |
Liability related to equity purchase agreement |  |  | 460 |  |
Other current liabilities |  |  |  |  |
Liability related to equity purchase agreement |  |  | 500 |  |
Crede Note |  |  |  |  |
Loss Contingency, Damages Sought, Value |  | 2,200 |  |  |
Warrants, fair value |  | 400 |  |  |
Gain (loss) on settlement of equity instruments |  | $ (400) |  |  |
Issuance of convertible notes |  |  |  |  | $ 1,450
Settled Litigation | Crede Note |  |  |  |  |
Litigation Settlement, Amount Awarded to Other Party | $ 1,925 |  |  |  |
Liability For Settlement Payment Period |  | 16 months |  |  |
Damages paid |  |  | $ 500 |  |
Settled Litigation | Leviston Resources LLC |  |  |  |  |
Issuance of convertible notes |  |  |  | $ 700 |
Settled Litigation | Leviston Resources LLC | Crede Note | Accrued expenses |  |  |  |  |
Issuance of convertible notes |  |  |  | $ 200 |

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