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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 09, 2020
Investments in Marketable Securities [Abstract] |  |  |  |  |
Unrealized losses on marketable securities | $ (634) |  | $ (634) |  |
Impairment of Long-Lived Assets [Abstract] |  |  |  |  |
Impairments | $ 0 | $ 0 | $ 0 | $ 0 |
Warrant Liabilities [Abstract] |  |  |  |  |
Number of warrants issued per unit issued during IPO (in shares) |  |  |  |  | 0.33

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