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DEBT - Paycheck Protection Program Liquidity Facility Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Accrued interest and unused commitment fee payable $ 537 $ 564
Revolving Credit Facility | Paycheck Protection Program Liquidity Facility, CARES Act | Line of Credit    
Debt Instrument [Line Items]    
Debt outstanding $ 18,100