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Segment Information - Revenue Information by 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

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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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