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Segment Information - Sales Information by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue from External Customer [Line Items]
Sales	$ 184,673	$ 162,701	$ 354,952	$ 304,905
Access & Aggregation [Member]
Revenue from External Customer [Line Items]
Sales	138,639	102,232	258,782	196,087
Customer Devices [Member]
Revenue from External Customer [Line Items]
Sales	33,833	40,876	70,101	73,229
Traditional & Other Products [Member]
Revenue from External Customer [Line Items]
Sales	$ 12,201	$ 19,593	$ 26,069	$ 35,589

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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