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Business and Summary of Significant Accounting Policies - Concentrations (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
One distributor | Revenue | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage	46.00%	43.00%	46.00%	42.00%
One distributor | Accounts receivable | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage			47.00%
Channel network | Revenue | Sales method risk
Concentration Risk [Line Items]
Concentration risk, percentage	88.00%	84.00%	87.00%	82.00%

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