Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,025,536	$ 563,004	$ 506,510
Subscriber Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	390,454	206,210	178,664
Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	374,002	356,794	327,846
Optical Networking Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	261,080
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	916,793	498,834	438,015
Network Solutions [Member] | Subscriber Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	364,238	189,825	163,349
Network Solutions [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	326,934	309,009	274,666
Network Solutions [Member] | Optical Networking Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	225,621
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	108,743	64,170	68,495
Services & Support [Member] | Subscriber Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	26,216	16,385	15,315
Services & Support [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	47,068	$ 47,785	53,180
Services & Support [Member] | Optical Networking Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 35,459