Segment Information - Revenue Information by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation Of Revenue [Line Items]
Revenue	$ 172,038	$ 143,232	$ 326,556	$ 270,765
Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	89,761	90,964	185,221	160,038
Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	78,144	47,810	132,750	102,379
Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 4,133	$ 4,458	$ 8,585	$ 8,348