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LOANS PAYABLE - Warrants fair value (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 21 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Warrants issued 147,058   147,058   147,058  
Warrant purchase price $ 4.08   $ 4.08   $ 4.08  
Amortization of debt issuance costs $ 300 $ 200 $ 694 $ 694 $ 700  
Unamortized Debt Issuance Expense $ 386   $ 386   $ 386 $ 1,080
Warrants [Member]            
Warrant coverage percentage     2.00%      
Warrants issued 147,058   147,058   147,058  
Warrant purchase price $ 4.08   $ 4.08   $ 4.08  
Class Of Warrant Or Right Fair Value $ 1,000   $ 1,000   $ 1,000  
Financing expenses, Hercules Loan Agreement     $ 2,800