Basis of Presentation and Significant Accounting Policies - Concentration of Risk (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Accounts Receivable | Customer Concentration Risk | Customer Seven
Concentration Risk [Line Items]
Concentration risk, percentage			14.70%
Accounts Receivable | Customer Concentration Risk | Customer Eight
Concentration Risk [Line Items]
Concentration risk, percentage			11.10%
Accounts Receivable | Customer Concentration Risk | Customer One
Concentration Risk [Line Items]
Concentration risk, percentage					66.80%
Sales Revenue, Net | Customer Concentration Risk | Customer One
Concentration Risk [Line Items]
Concentration risk, percentage	15.00%		18.00%
Sales Revenue, Net | Customer Concentration Risk | Customer Two
Concentration Risk [Line Items]
Concentration risk, percentage	52.00%	54.00%	44.00%	51.00%
Sales Revenue, Net | Customer Concentration Risk | Customer Three
Concentration Risk [Line Items]
Concentration risk, percentage			8.00%
Sales Revenue, Net | Customer Concentration Risk | Customer Four
Concentration Risk [Line Items]
Concentration risk, percentage		12.00%
Asia Pacific | Sales Revenue, Net | Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	15.20%	0.10%	18.70%	5.90%