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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Other current assets | $ 324 | $ 272
Prepaid insurance | 300 | 200
Prepaid assets and other receivables | 100 | 100
Amortization expense for intangible assets | $ 1,000 | $ 1,000
Awards outstanding | 0 | 0
Impairment of intangible assets | $ 0 | $ 0
Deferred grant revenue | 100 | 100
Amortization expense of converted debt issuance costs | 300 | 100
Insurance claims, recoveries | 0 | 0
Income tax, interest and penalties | $ 0 | 0
Share-based compensation arrangement by share-based payment award, expiration period | 10 years |
Advertising expense | $ 100 | $ 100
Research and development expense | $ 1,200 |
Securities not included in the computation of diluted net loss per share | 1,846,989 | 2,281,701
Performance Based Vesting [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Awards outstanding | 53,334 | 53,334
In-Process Research and Development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment of intangible assets |  | $ 1,600
Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Current prepaid expense |  | $ 100
Stock options, unvested options, vesting period | 4 years |

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