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Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Revenue	$ 127,533	$ 114,523
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	113,809	97,372
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	13,724	17,151
Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	69,074	65,966
Access & Aggregation [Member] | Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	60,053	53,055
Access & Aggregation [Member] | Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	9,021	12,911
Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	54,569	42,179
Subscriber Solutions & Experience [Member] | Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	52,269	39,983
Subscriber Solutions & Experience [Member] | Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	2,300	2,196
Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	3,890	6,378
Traditional & Other Products [Member] | Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	1,487	4,334
Traditional & Other Products [Member] | Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 2,403	$ 2,044

X

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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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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
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