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Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Revenue	$ 114,092	$ 140,335	$ 414,274	$ 389,189
Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	65,114	91,901	274,313	258,323
Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	42,476	38,552	119,731	103,213
Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	6,502	9,882	20,230	27,653
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	94,018	121,043	359,007	341,359
Network Solutions [Member] | Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	48,902	76,046	230,837	220,653
Network Solutions [Member] | Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	40,382	37,313	113,545	99,396
Network Solutions [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	4,734	7,684	14,625	21,310
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	20,074	19,292	55,267	47,830
Services & Support [Member] | Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	16,212	15,855	43,476	37,670
Services & Support [Member] | Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	2,094	1,239	6,186	3,817
Services & Support [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,768	$ 2,198	$ 5,605	$ 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://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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