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Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation Of Revenue [Line Items]
Revenue	$ 154,518	$ 127,533
Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	95,460	69,074
Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	54,606	54,569
Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	4,452	3,890
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	138,374	113,809
Network Solutions [Member] | Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	84,289	60,053
Network Solutions [Member] | Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	51,823	52,269
Network Solutions [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	2,262	1,487
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	16,144	13,724
Services & Support [Member] | Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	11,171	9,021
Services & Support [Member] | Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	2,783	2,300
Services & Support [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 2,190	$ 2,403

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

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-Publisher FASB
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