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STOCKHOLDERS' EQUITY (Note Conversion Warrants) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Aug. 31, 2017 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Feb. 29, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |
Deemed dividend |  |  | $ 0 | $ 0 | $ 0 | $ 3,344 |
Note Conversion Warrants |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 0.40 |  |  |  |  |  | $ 2.25
Note Conversion Warrants | Deemed Dividend C |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Deemed dividend | $ 5 |  |  |  |  |  |
Common Stock [Member] | Note Conversion Warrants |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Conversion of convertible notes into common stock (in shares) |  | 23,999 |  |  |  |  |
Exercise price (in dollars per share) |  | $ 45.00 |  |  |  |  |

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