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Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation Of Revenue [Line Items]
Revenue	$ 227,704	$ 272,331	$ 679,868	$ 923,621
Subscriber Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	90,096	61,485	242,262	222,486
Optical Networking Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	70,535	116,200	219,314	406,952
Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	67,073	94,646	218,292	294,183
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	181,488	228,564	541,955	793,984
Network Solutions [Member] | Subscriber Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	81,060	52,921	215,044	196,726
Network Solutions [Member] | Optical Networking Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	47,474	94,592	152,068	342,390
Network Solutions [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	52,954	81,051	174,843	254,868
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	46,216	43,767	137,913	129,637
Services & Support [Member] | Subscriber Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	9,036	8,564	27,218	25,760
Services & Support [Member] | Optical Networking Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	23,061	21,608	67,246	64,562
Services & Support [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 14,119	$ 13,595	$ 43,449	$ 39,315

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