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Segment Information - Revenue Information by 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

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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.

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