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Concentrations - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
One automotive OEM customer | Sales Revenue, Net | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 50.00% 57.00%  
One automotive OEM customer | Accounts Receivable | Credit Concentration      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 25.00%   37.00%
Supplier One | Material Purchases | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 12.00%    
Supplier Two | Material Purchases | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 11.00%    
Supplier Three | Material Purchases | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 11.00%    
Supplier Four | Material Purchases | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration Risk, Percentage   36.00%