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CONVERTIBLE NOTES (Convertible Promissory Notes - Exchange Notes) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Apr. 16, 2019 | Dec. 31, 2018 | Feb. 28, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt |  | $ 1,022 |  | $ 519 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 906,769 |  |  |  |  |
Repayments of Notes Payable |  | $ 284 | $ 231 |  |  |  |
Conversion of interest on convertible debt into common stock |  | $ 1,938 | 7,272 |  |  |  |
Write off of derivative liability | $ 0 |  | 100 |  |  |  |
Creditor Warrants Relating to Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  | 7,207 | 7,207
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  | $ 112.50
Crede Note |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of Notes Payable | $ 0 |  | $ 0 |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  | 270,699 |  | 270,699 |  |  |
Long-term Debt |  | $ 0 |  |  | $ 1,450 |  |
Number of shares converted from debt instrument (in shares) |  | 270,699 |  | 270,699 |  |  |
Convertible Debt [Member] | Convertible promissory notes - Exchange Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | 0 |  | 155,351 |  |  |  |
Conversion of interest on convertible debt into common stock | $ 0 |  | $ 600 |  |  |  |
Number of shares converted from debt instrument (in shares) | 0 |  | 155,351 |  |  |  |

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