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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