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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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Revenue	$ 272,331	$ 340,709	$ 923,621	$ 667,265
Optical Networking Solutions
Disaggregation Of Revenue [Line Items]
Revenue	116,200	118,845	406,952	118,845
Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	94,646	88,189	294,183	278,273
Subscriber Solutions
Disaggregation Of Revenue [Line Items]
Revenue	61,485	133,675	222,486	270,147
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	228,564	304,940	793,984	599,306
Network Solutions [Member] | Optical Networking Solutions
Disaggregation Of Revenue [Line Items]
Revenue	94,592	103,011	342,390	103,011
Network Solutions [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	81,051	76,591	254,868	243,396
Network Solutions [Member] | Subscriber Solutions
Disaggregation Of Revenue [Line Items]
Revenue	52,921	125,338	196,726	252,899
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	43,767	35,769	129,637	67,959
Services & Support [Member] | Optical Networking Solutions
Disaggregation Of Revenue [Line Items]
Revenue	21,608	15,834	64,562	15,834
Services & Support [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	13,595	11,598	39,315	34,877
Services & Support [Member] | Subscriber Solutions
Disaggregation Of Revenue [Line Items]
Revenue	$ 8,564	$ 8,337	$ 25,760	$ 17,248

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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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