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BORROWINGS (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Jun. 25, 2018
Debt Instrument [Line Items]      
Outstanding balance of loan $ 3,098 $ 3,069  
U.S. Bank      
Debt Instrument [Line Items]      
Letters of credit, outstanding amount 280 280  
Commercial purchasing card      
Debt Instrument [Line Items]      
Outstanding balance 59 48  
Unused borrowing capacity 941 $ 1,000  
Senior Notes | High Bench Loan      
Debt Instrument [Line Items]      
Annual interest rate     11.00%
Outstanding balance of loan $ 3,098    
Senior Notes | High Bench Loan | Default rate      
Debt Instrument [Line Items]      
Annual interest rate     18.00%