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FAIR VALUE (Schedule of Changes in Fair Value of Liability) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 1,313 | $ 402 | $ 1,325 | $ 1,338
Total (gains) losses: |  |  |  |
Revaluation recognized in earnings | 894 | 372 | 1,012 | (564)
Deductions - warrant liability settlement |  |  | (130) |
Balance at end of period | 2,207 | 774 | 2,207 | 774
2016 Warrant Liability [Member] |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | 58 | 130 | 70
Total (gains) losses: |  |  |  |
Revaluation recognized in earnings |  | (19) |  | (31)
Deductions - warrant liability settlement |  |  | (130) |
Balance at end of period |  | 39 |  | 39
Bridge Note Warrant Liabilities [Member] |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 1,313 | 344 | 1,195 | 1,268
Total (gains) losses: |  |  |  |
Revaluation recognized in earnings | 894 | 391 | 1,012 | (533)
Balance at end of period | $ 2,207 | $ 735 | $ 2,207 | $ 735

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