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DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total debt $ 42 $ 46,714
Less current portion of long-term debt (23) (21)
Long-term debt, net of current portion 19 46,693
Lines of credit    
Debt Instrument [Line Items]    
Total debt 0 26,677
Term loans    
Debt Instrument [Line Items]    
Total debt 0 19,980
Capital leases    
Debt Instrument [Line Items]    
Total debt $ 42 $ 57