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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Finance lease assets | $ 289 |  | $ 204
Amounts reclassified to finance lease right-of-use assets | 96 |  |
Amounts reclassified to operating lease right-of-use assets | $ 0 | $ 0 |
Securities not included in the computation of diluted net loss per share | 2,381,497 | 5,859,395 |
Stock Options [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Securities not included in the computation of diluted net loss per share | 1,358,096 | 802,113 |
Warrants [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Securities not included in the computation of diluted net loss per share | 905,901 | 907,601 |
Preferred Stock [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Securities not included in the computation of diluted net loss per share | 117,500 | 117,500 |
Convertible Notes [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Securities not included in the computation of diluted net loss per share |  | 4,032,181 |
Reclassified to finance lease right of use assets [Member] | Right of Use Asset |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Finance lease assets |  |  | 29
Reclassified to finance lease right of use assets [Member] | Property, Plant and Equipment |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Finance lease assets |  |  | $ 175

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