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DEBT - Paycheck Protection Program Liquidity Facility Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Accrued interest and unused commitment fee payable $ 564 $ 650
Revolving Credit Facility | Paycheck Protection Program Liquidity Facility, CARES Act | Line of Credit    
Debt Instrument [Line Items]    
Debt outstanding $ 14,500