Concentrations - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
One automotive OEM customer | Sales Revenue, Net | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	48.00%	68.00%	52.00%	60.00%
One automotive OEM customer | Accounts Receivable | Credit Concentration
Concentration Risk [Line Items]
Concentration risk, percentage			22.00%		35.00%
Supplier One | Material Purchases | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	14.00%		18.00%
Supplier Two | Material Purchases | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	12.00%		11.00%
Supplier Three | Material Purchases | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	12.00%
Supplier Four | Material Purchases | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%			38.00%
Supplier Five [Member] | Material Purchases | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage		36.00%
Supplier Six [Member] | Material Purchases | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage		12.00%