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Debt - ABL Credit Facility (Details) - Revolving Credit Facility - USD ($)
Jul. 24, 2018
Sep. 30, 2018
Dec. 31, 2017
ABL Credit Facility      
Debt Instrument [Line Items]      
Line of credit facility, increase $ 10,000,000    
Maximum borrowing amount $ 85,000,000    
ABL Revlover      
Debt Instrument [Line Items]      
Line of credit facility, amount outstanding   $ 0 $ 0
Line of credit facility, borrowing base   $ 67,300,000