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DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Outstanding borrowings $ 14,875 $ 42,128
Less: debt issuance costs (603) (773)
Total debt 14,272 41,355
Less: current portion of long-term debt (3,125) (3,125)
Long-term debt 11,147 38,230
Capital expenditure facility    
Debt Instrument [Line Items]    
Outstanding borrowings 14,875 25,000
Line of credit | U.S. Dollar revolving loan    
Debt Instrument [Line Items]    
Outstanding borrowings $ 0 $ 17,128