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BORROWINGS - Schedule of Contractual Future Repayments (Details) - Secured Debt - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Remainder of 2021 $ 101  
Less: interest (1)  
Less: unamortized debt issuance cost 0  
Present value of vendor financing arrangements $ 100 $ 600