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NOTES PAYABLE - Schedule of Outstanding Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Outstanding principal $ 43,025  
Notes payable    
Debt Instrument [Line Items]    
Outstanding principal 43,025 $ 38,866
Unamortized discount (425) (571)
Total $ 42,600 $ 38,866