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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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Revenue	$ 340,709	$ 138,081	$ 667,265	$ 408,846
Subscriber Solutions
Disaggregation Of Revenue [Line Items]
Revenue	133,675	46,867	270,147	152,489
Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	88,189	91,214	278,273	256,357
Optical Networking Solutions
Disaggregation Of Revenue [Line Items]
Revenue	118,845		118,845
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	304,940	120,767	599,306	360,025
Network Solutions [Member] | Subscriber Solutions
Disaggregation Of Revenue [Line Items]
Revenue	125,338	42,704	252,899	140,257
Network Solutions [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	76,591	78,063	243,396	219,768
Network Solutions [Member] | Optical Networking Solutions
Disaggregation Of Revenue [Line Items]
Revenue	103,011		103,011
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	35,769	17,314	67,959	48,821
Services & Support [Member] | Subscriber Solutions
Disaggregation Of Revenue [Line Items]
Revenue	8,337	4,163	17,248	12,232
Services & Support [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	11,598	$ 13,151	34,877	$ 36,589
Services & Support [Member] | Optical Networking Solutions
Disaggregation Of Revenue [Line Items]
Revenue	$ 15,834		$ 15,834

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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.

+ References

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