Income Taxes - Effective Income Tax Rate Differs from Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Tax provision computed at the federal statutory rate	21.00%	21.00%	21.00%	21.00%
State income tax provision, net of federal benefit	0.06%	1.33%	2.60%
Federal research credits	0.66%	3.23%	6.74%
Foreign taxes	(0.02%)	3.20%	6.29%
Tax-exempt income	0.04%	0.06%	0.21%
Change in valuation allowance	(6.48%)	(34.83%)	63.92%
Non-deductible transaction costs			(2.74%)
Foreign tax credits	0.84%	2.42%	(0.40%)
Stock-based compensation	(0.39%)	(0.56%)	(2.09%)
Withholding taxes	(0.08%)	0.01%	0.03%
Adtran Networks tax exempt income		1.41%
Return to accrual	0.59%	0.61%	0.24%
Global intangible low-taxed income ("GILTI")	(3.07%)	(5.81%)	(8.08%)
Adtran Networks Goodwill Impairment	(13.84%)	(4.57%)
Other, net	(0.97%)	0.40%	(0.24%)
Effective Tax Rate	(1.66%)	(12.10%)	87.48%