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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Narrative) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 12, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Jan. 29, 2019 | Jan. 15, 2019
Reduction in Certain Accrued Expense and Accounts Payable |  | $ 1,100,000 | $ 100,000 |  | $ 1,300,000 | $ 100,000 |  |  |
Common stock warrant liabilities |  | 2,336,000 |  |  | 2,336,000 |  | $ 1,132,000 |  |
Gain in warrant revaluation |  |  |  | $ 200,000 |  |  |  |  |
Gain (loss) on settlement of equity instrments |  | $ 1,084,000 | $ 6,000 |  | 1,251,000 | 147,000 |  |  |
Proceeds from convertible notes |  |  |  |  | $ 2,150,000 | 1,660,000 |  |  |
Liability related to equity purchase agreement |  |  |  |  |  |  | 460,000 |  |
Other current liabilities |  |  |  |  |  |  |  |  |
Liability related to equity purchase agreement |  |  |  |  |  |  | 500,000 |  |
Crede Note |  |  |  |  |  |  |  |  |
Warrants, fair value | $ 400,000 |  |  |  |  |  |  |  |
Gain (loss) on settlement of equity instrments |  |  |  |  |  | $ (400,000) |  |  |
Issuance of convertible notes |  |  |  |  |  |  |  |  | $ 1,450,000
Settled Litigation | Crede Note |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount Awarded to Other Party | $ 1,925,000 |  |  |  |  |  |  |  |
Liability For Settlement Payment Period |  |  |  |  | 16 months |  |  |  |
Damages paid |  |  |  |  |  |  | $ 500,000 |  |
Settled Litigation | Leviston Resources LLC |  |  |  |  |  |  |  |  |
Issuance of convertible notes |  |  |  |  |  |  |  | $ 700,000 |
Settled Litigation | Leviston Resources LLC | Crede Note | Accrued expenses |  |  |  |  |  |  |  |  |
Issuance of convertible notes |  |  |  |  |  |  |  | $ 200,000 |

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