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LONG-TERM DEBT (Settlement Agreement) (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jan. 02, 2019 | Dec. 31, 2018 | Sep. 21, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) |  | 8.00% |  |  |
Total debt | $ 326 |  | $ 516 |  |
Settlement Agreements |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt |  |  |  |  | $ 3,200
Settlement Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 57 |  | 66 |  |
Settlement Agreement [Member] | Settlement Agreements |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Frequency of periodic payment | monthly |  |  |  |
Debt instrument, term | 2 years |  |  |  |
Date of first required payment | Nov. 01, 2018 |  |  |  |
Maturity date | Nov. 01, 2020 |  |  |  |
Debt instrument, face amount |  |  |  | $ 100 |
Interest rate (as a percent) | 10.00% |  |  |  |
Total debt | $ 100 |  | $ 100 |  |

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