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Segment Information - Sales Information by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue from External Customer [Line Items]
Sales	$ 185,112	$ 168,890	$ 540,064	$ 473,795
Access & Aggregation [Member]
Revenue from External Customer [Line Items]
Sales	135,959	120,618	394,741	316,705
Customer Devices [Member]
Revenue from External Customer [Line Items]
Sales	35,582	32,984	105,683	106,213
Traditional & Other Products [Member]
Revenue from External Customer [Line Items]
Sales	$ 13,571	$ 15,288	$ 39,640	$ 50,877

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+ References

No definition available.

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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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