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CONVERTIBLE NOTES (Convertible Promissory Notes - Exchange Notes) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 12, 2019 | Sep. 17, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Feb. 28, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt |  |  | $ 399 | $ 516 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 917,563 |  |  |  |
Original debt amount |  |  |  |  | $ 456 |  |
Conversion of convertible debt plus interest into common stock | $ 1,900 |  |  | $ 200 |  |  |
Number of shares converted from debt instrument (in shares) | 120,983 |  |  | 93,333 |  |  |
Creditor Warrants Relating to Secured Debt [Member] |  |  |  |  |  |  |
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
Senior Secured Convertible Promissory Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, term |  | 18 months |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  | $ 2,800 |  |  |  |  |
Settlement Agreements |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total debt |  |  |  |  |  | $ 3,200 |
Warrants and Rights Outstanding |  |  |  |  |  | 1,900 |
Secured Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Original debt amount |  | $ 3,200 |  |  |  |  |
Debt Restructured |  |  |  |  |  | 6,300 |
Convertible Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  |  | $ 3,700 |  |  |  |
Number of shares converted from debt instrument (in shares) |  |  | 1,061,069 |  |  |  |
Convertible Debt [Member] | Convertible promissory notes - Exchange Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Conversion of convertible debt plus interest into common stock |  |  | $ 600 | $ 2,200 |  | $ 2,800 |
Number of shares converted from debt instrument (in shares) |  |  | 155,351 | 291,562 |  | 446,913 |

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