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Segment Information - Revenue Information by 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

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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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