Concentrations - Narrative (Details) - Customer Concentration Risk	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
One additional OEM customer | Sales Revenue, Net
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%	12.00%
Supplier One | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage			14.00%
Supplier One | Material Purchases
Concentration Risk [Line Items]
Concentration risk, percentage	43.00%		37.00%
Supplier Two | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage				16.00%
Supplier Two | Material Purchases
Concentration Risk [Line Items]
Concentration risk, percentage	17.00%		10.00%
Supplier Three | Material Purchases
Concentration Risk [Line Items]
Concentration risk, percentage		21.00%		26.00%
Supplier Four | Material Purchases
Concentration Risk [Line Items]
Concentration risk, percentage		18.00%		15.00%
Supplier Five | Material Purchases
Concentration Risk [Line Items]
Concentration risk, percentage		16.00%		14.00%