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Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Revenue	$ 114,523	$ 143,791
Reclassification of Property, Plant and Equipment to Other Assets [Member]
Disaggregation Of Revenue [Line Items]
Revenue	65,966	99,778
Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	42,179	36,753
Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	6,378	7,260
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	97,372	125,822
Network Solutions [Member] | Reclassification of Property, Plant and Equipment to Other Assets [Member]
Disaggregation Of Revenue [Line Items]
Revenue	53,055	85,673
Network Solutions [Member] | Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	39,983	34,719
Network Solutions [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	4,334	5,430
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	17,151	17,969
Services & Support [Member] | Reclassification of Property, Plant and Equipment to Other Assets [Member]
Disaggregation Of Revenue [Line Items]
Revenue	12,911	14,105
Services & Support [Member] | Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	2,196	2,034
Services & Support [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 2,044	$ 1,830

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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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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