Summary of Significant Accounting Policies - Additional Information (Detail) € / shares in Units, € in Millions		3 Months Ended										6 Months Ended	9 Months Ended	12 Months Ended
	Oct. 01, 2024 USD ($)	Dec. 31, 2024 USD ($) IncentivePlan	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2024 € / shares	Mar. 31, 2024 USD ($)	Mar. 31, 2024 € / shares	Dec. 31, 2023 USD ($) € / shares	Sep. 30, 2023 € / shares	Jun. 30, 2023 € / shares	Mar. 31, 2023 € / shares	Jun. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) IncentivePlan shares	Dec. 31, 2024 EUR (€) shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2023 EUR (€) shares	Dec. 31, 2022 USD ($)	Dec. 31, 2024 EUR (€) IncentivePlan	Oct. 18, 2022 shares	Dec. 31, 2021 USD ($)
Summary Of Significant Accounting Policy [Line Items]
Cash, uninsured amount		$ 72,400,000												$ 72,400,000
Percentage of guaranteed interest rate		5.00%												5.00%					5.00%
Percentage of guaranteed interest rate plus a variable component		3.37%												3.37%					3.37%
Aggregate exit compensation payments obligation including guaranteed interest		$ 344,900,000												$ 344,900,000					€ 333.2
Expire date of exit compensation														Mar. 16, 2023	Mar. 16, 2023
Annual recurring compensation obligation														$ 9,300,000	€ 8.9
Accrued annual recurring compensation obligation														$ 9,800,000		$ 10,100,000
Number of shares tendered | shares														831,000	831,000	67,000	67,000
Exit compensation payments														$ 17,400,000	€ 15.7	$ 1,300,000	€ 1.2
Amount of redemptions		17,400,000												17,400,000
Total carrying value of assets held for sale		11,901,000												11,901,000
Impairment losses for long-lived assets and intangible assets														0		0		$ 0
Long-lived assets		284,893,000						$ 337,423,000						284,893,000		337,423,000
Goodwill impairment	$ 0	0	$ 0	$ 0		$ 297,353,000						$ 297,353,000	$ 297,353,000	297,353,000		37,874,000		0
Goodwill impairment charges, other																0
Impairment charges related to capitalized implementation costs														$ 0		0		16,900,000
Period of assurance-based warranty for product defects														90 days to five years	90 days to five years
Liability for warranty obligations		$ 4,512,000						6,445,000						$ 4,512,000		6,445,000		7,196,000			$ 5,403,000
Number of stock incentive plans | IncentivePlan		2												2					2
Stock-based compensation expense														$ 15,988,000		16,381,000		28,322,000
Reduction of research and development expense recognized														9,200,000		5,200,000		1,100,000
Research and development costs		$ 49,314,000	$ 51,577,000	$ 60,352,000		60,215,000						$ 120,567,000	$ 172,144,000	221,458,000		258,311,000		173,757,000
Network Solutions [Member]
Summary Of Significant Accounting Policy [Line Items]
Long-lived assets		361,500,000												361,500,000
Goodwill impairment						297,400,000
Services & Support [Member]
Summary Of Significant Accounting Policy [Line Items]
Goodwill impairment						$ 0										37,900,000
Purchase Agreement [Member] | Prior Factoring Agreement [Member]
Summary Of Significant Accounting Policy [Line Items]
Credit agreement current borrowing capacity		$ 0						14,300,000						$ 0		14,300,000
ASU 2023-07 [Member]
Summary Of Significant Accounting Policy [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]		true												true					true
Change in Accounting Principle, Accounting Standards Update, Adoption Date		Jan. 01, 2024												Jan. 01, 2024					Jan. 01, 2024
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]		true												true					true
Prepaid Expenses and Other Current Assets [Member]
Summary Of Significant Accounting Policy [Line Items]
Current deferred costs related to prepaid and other assets		$ 2,200,000						2,100,000						$ 2,200,000		2,100,000
Other Non-Current Assets [Member]
Summary Of Significant Accounting Policy [Line Items]
Capitalized implementation costs		100,000						$ 300,000						100,000		300,000
Selling, General and Administrative Expenses [Member]
Summary Of Significant Accounting Policy [Line Items]
Amortization expense														100,000		5,900,000		3,900,000
Stock-based compensation expense														$ 11,058,000		11,066,000		$ 20,844,000
Wells Fargo Credit Agreement [Member]
Summary Of Significant Accounting Policy [Line Items]
Net leverage ratio														0.0325	0.0325
Wells Fargo Credit Agreement [Member] | Third and Fourth Quarters Ending Springing Covenant Event [Member]
Summary Of Significant Accounting Policy [Line Items]
Net leverage ratio														0.035	0.035
Wells Fargo Credit Agreement [Member] | First Quarter Ending Springing Covenant Period [Member]
Summary Of Significant Accounting Policy [Line Items]
Net leverage ratio														0.04	0.04
Wells Fargo Credit Agreement [Member] | Acorn HoldCo, Inc., [Member]
Summary Of Significant Accounting Policy [Line Items]
Available for future borrowings		180,800,000												$ 180,800,000
Credit agreement current borrowing capacity		$ 6,100,000												$ 6,100,000
Minimum [Member]
Summary Of Significant Accounting Policy [Line Items]
Maintenance service periods														1 month	1 month
Maintenance contract period														1 month	1 month
Minimum [Member] | Building and Land Improvements [Member]
Summary Of Significant Accounting Policy [Line Items]
Property, plant and equipment, estimated useful lives		5 years												5 years					5 years
Minimum [Member] | Office Machinery and Equipment [Member]
Summary Of Significant Accounting Policy [Line Items]
Property, plant and equipment, estimated useful lives		3 years												3 years					3 years
Minimum [Member] | Engineering Machinery and Equipment [Member]
Summary Of Significant Accounting Policy [Line Items]
Property, plant and equipment, estimated useful lives		3 years												3 years					3 years
Minimum [Member] | Computer Software [Member]
Summary Of Significant Accounting Policy [Line Items]
Property, plant and equipment, estimated useful lives		3 years												3 years					3 years
Minimum [Member] | Wells Fargo Credit Agreement [Member]
Summary Of Significant Accounting Policy [Line Items]
Net leverage ratio														0.035	0.035
Fixed charge coverage ratio								0.0125						0.0125	0.0125
Minimum [Member] | Wells Fargo Credit Agreement [Member] | Third and Fourth Quarters Ending Springing Covenant Event [Member]
Summary Of Significant Accounting Policy [Line Items]
Net leverage ratio														0.035	0.035
Maximum [Member]
Summary Of Significant Accounting Policy [Line Items]
Maintenance service periods														5 years	5 years
Maintenance contract period														5 years	5 years
Software and hardware maintenance contract period														10 years	10 years
Maximum [Member] | Other Non-Current Assets [Member]
Summary Of Significant Accounting Policy [Line Items]
Non-current deferred costs related to other non-current assets		$ 100,000						$ 100,000						$ 100,000		$ 100,000
Maximum [Member] | Building and Land Improvements [Member]
Summary Of Significant Accounting Policy [Line Items]
Property, plant and equipment, estimated useful lives		39 years												39 years					39 years
Maximum [Member] | Office Machinery and Equipment [Member]
Summary Of Significant Accounting Policy [Line Items]
Property, plant and equipment, estimated useful lives		7 years												7 years					7 years
Maximum [Member] | Engineering Machinery and Equipment [Member]
Summary Of Significant Accounting Policy [Line Items]
Property, plant and equipment, estimated useful lives		7 years												7 years					7 years
Maximum [Member] | Computer Software [Member]
Summary Of Significant Accounting Policy [Line Items]
Property, plant and equipment, estimated useful lives		5 years												5 years					5 years
Maximum [Member] | Wells Fargo Credit Agreement [Member]
Summary Of Significant Accounting Policy [Line Items]
Net leverage ratio								0.05						0.05	0.05
Maximum [Member] | Wells Fargo Credit Agreement [Member] | First Quarter Ending Springing Covenant Period [Member]
Summary Of Significant Accounting Policy [Line Items]
Net leverage ratio														0.04	0.04
Adtran Networks [Member]
Summary Of Significant Accounting Policy [Line Items]
Number of shares tendered | shares														831,000	831,000	67,000	67,000
Exit compensation payments														$ 17,400,000	€ 15.7	$ 1,300,000	€ 1.2
Equity ownership percentage		33.00%						34.70%						33.00%		34.70%			33.00%
Annual recurring compensation payment per share | € / shares					€ 0.52		€ 0.52	$ 0.52	€ 0.52	€ 0.52	€ 0.52
Accrued liability per share | € / shares					€ 0.59		€ 0.59	$ 0.59	€ 0.59	€ 0.59	€ 0.59
Adtran Networks [Member] | Maximum [Member]
Summary Of Significant Accounting Policy [Line Items]
Number of additional shares authorized to purchase | shares																				15,346,544