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Segment Information - Sales Information by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Revenue	$ 133,143	$ 114,092	$ 376,381	$ 414,274
Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue	85,423	65,114	234,165	274,313
Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue	43,125	42,476	125,697	119,731
Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 4,595	$ 6,502	$ 16,519	$ 20,230

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