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Fair Value of Financial Instruments - Fair Value Relating to Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Amount outstanding under letters of credit   $ 887  
Carrying Value | ABL Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Credit facilities $ 4,300 74,000  
Carrying Value | Japan ABL Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Credit facilities 0 13,755  
Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Amount outstanding under letters of credit   887  
Fair Value | ABL Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Credit facilities 4,300 74,000  
Fair Value | Japan ABL Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Credit facilities 0 13,755  
Secured Debt | Equipment Note      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt 10,183 11,815  
Secured Debt | Carrying Value | Equipment Note      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt   11,815  
Secured Debt | Fair Value | Equipment Note      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term Debt 10,183 $ 11,815  
Bank of America, N.A.      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Amount outstanding under letters of credit $ 1,205   $ 857