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Business Segments, Concentration of Credit Risk and Significant Customers - Schedule of Customers Who Accounted for at Least 10% of Total Net Revenue (Detail) - Net Revenues - Customer Concentration	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Customer A
Significant Customers
Percentage of concentration risk	33.00%	37.00%	27.00%	34.00%
Customer B
Significant Customers
Percentage of concentration risk	19.00%	29.00%	20.00%	15.00%
Customer C
Significant Customers
Percentage of concentration risk	19.00%
Customer D
Significant Customers
Percentage of concentration risk	15.00%		18.00%	17.00%
Customer E
Significant Customers
Percentage of concentration risk			17.00%	18.00%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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