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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				6 Months Ended
	Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Customer A
Significant Customers
Percentage of concentration risk	29.00%		31.00%		26.00%	39.00%
Customer B
Significant Customers
Percentage of concentration risk	27.00%		21.00%		21.00%	22.00%
Customer C
Significant Customers
Percentage of concentration risk	12.00%			[1]	13.00%		[1]
Customer D
Significant Customers
Percentage of concentration risk		[1]	24.00%		15.00%	12.00%
[1] Represents less than 10%

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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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