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Revenue - Disaggregate of Revenue by Major Source (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation Of Revenue [Line Items]
Revenue	$ 140,335	$ 185,112	$ 389,189	$ 540,064
Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	91,901		258,323
Customer Devices [Member]
Disaggregation Of Revenue [Line Items]
Revenue	38,552	35,582	103,213	105,683
Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	9,882	13,571	27,653	39,640
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	121,043	145,467	341,359	444,607
Network Solutions [Member] | Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	76,046		220,653
Network Solutions [Member] | Customer Devices [Member]
Disaggregation Of Revenue [Line Items]
Revenue	37,313		99,396
Network Solutions [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	7,684		21,310
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	19,292	$ 39,645	47,830	$ 95,457
Services & Support [Member] | Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	15,855		37,670
Services & Support [Member] | Customer Devices [Member]
Disaggregation Of Revenue [Line Items]
Revenue	1,239		3,817
Services & Support [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 2,198		$ 6,343

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- Definition

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.

+ References

No definition available.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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