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CONVERTIBLE NOTES (Convertible Promissory Notes - Exchange Notes) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 16, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Feb. 28, 2018
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 1,010 | $ 519 |
Repayments of Notes Payable |  | 322 | 473 |
Long-term Debt |  | 1,032 |  |
Conversion of convertible debt, plus interest, into common stock |  | 2,176 | 7,553 |
Creditor Warrants Relating to Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 112.50
Senior Secured Convertible Promissory Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Write off of derivative liability |  |  | 100 |
Crede Note |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | 270,699 |  |  |
Long-term Debt |  | $ 0 | 0 |
Conversion of convertible debt, plus interest, into common stock | $ 1,450 |  |  |
Number of shares converted from debt instrument (in shares) | 270,699 |  |  |
Convertible Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt |  |  | $ 142 |
Convertible Debt [Member] | Convertible promissory notes - Exchange Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  | 0 | 155,351 |
Conversion of convertible debt, plus interest, into common stock |  | $ 0 | $ 600 |
Number of shares converted from debt instrument (in shares) |  | 0 | 155,351 |

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