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Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Revenue	$ 143,232	$ 128,715	$ 270,765	$ 243,238
Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	90,964	82,776	160,038	148,742
Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	47,810	40,393	102,379	82,572
Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	4,458	5,546	8,348	11,924
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	125,449	111,323	239,258	208,695
Network Solutions [Member] | Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	78,307	69,721	138,360	122,776
Network Solutions [Member] | Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	45,097	38,081	97,366	78,064
Network Solutions [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	2,045	3,521	3,532	7,855
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	17,783	17,392	31,507	34,543
Services & Support [Member] | Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	12,657	13,055	21,678	25,966
Services & Support [Member] | Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	2,713	2,312	5,013	4,508
Services & Support [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 2,413	$ 2,025	$ 4,816	$ 4,069

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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.

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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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