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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Revenue	$ 138,081	$ 133,143	$ 408,846	$ 376,381
Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	89,173	85,423	249,211	234,165
Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	44,912	43,125	147,291	125,697
Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	3,996	4,595	12,344	16,519
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	120,767	115,229	360,025	323,924
Network Solutions [Member] | Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	77,104	71,919	215,464	194,695
Network Solutions [Member] | Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	42,093	40,843	139,459	118,907
Network Solutions [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	1,570	2,467	5,102	10,322
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	17,314	17,914	48,821	52,457
Services & Support [Member] | Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	12,069	13,504	33,747	39,470
Services & Support [Member] | Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	2,819	2,282	7,832	6,790
Services & Support [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 2,426	$ 2,128	$ 7,242	$ 6,197

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.

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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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