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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Finance lease assets | $ 508 |  | $ 204
Amounts reclassified to finance lease right-of-use assets | 321 |  |
Amounts reclassified to operating lease right-of-use assets | $ 0 | $ 0 |
Securities not included in the computation of diluted net loss per share | 2,311,399 | 1,815,502 |
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 | 1,361,998 | 791,233 |
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 | 831,901 | 906,769 |
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 |
Right of Use Asset | Reclassified to finance lease right of use assets [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Finance lease assets |  |  | 29
Right of Use Asset | Maximum | Reclassified to finance lease right of use assets [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Finance lease assets |  |  | 100
Property, Plant and Equipment [Member] | Reclassified to finance lease right of use assets [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Finance lease assets |  |  | $ 175

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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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