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Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation Of Revenue [Line Items]
Revenue	$ 225,991	$ 327,378	$ 452,164	$ 651,290
Optical Networking Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	73,687	142,996	148,780	290,752
Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	69,907	102,717	151,219	199,537
Subscriber Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	82,397	81,665	152,165	161,001
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	179,194	283,002	360,467	565,420
Network Solutions [Member] | Optical Networking Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	51,467	120,221	104,594	247,798
Network Solutions [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	54,112	89,263	121,889	173,817
Network Solutions [Member] | Subscriber Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	73,615	73,518	133,984	143,805
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	46,797	44,376	91,697	85,870
Services & Support [Member] | Optical Networking Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	22,220	22,775	44,186	42,954
Services & Support [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	15,795	13,454	29,330	25,720
Services & Support [Member] | Subscriber Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 8,782	$ 8,147	$ 18,181	$ 17,196

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