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Business and Summary of Significant Accounting Policies - Concentrations (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
One distributor | Revenue | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage	43.00%	46.00%	43.00%	46.00%
One distributor | Accounts receivable | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk, percentage			42.00%		46.00%
Channel network | Revenue | Sales method risk
Concentration Risk [Line Items]
Concentration risk, percentage	90.00%	87.00%	90.00%	87.00%

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