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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2024

Accounting Policies [Abstract]

Summary of Impact of Revision to Specific Line Items in Condensed Consolidated Balance Sheets, Condensed Consolidated Statements of Loss, Condensed Consolidated Statements of Comprehensive Loss, and Condensed Consolidated Statements of Changes in Stockholders

The following tables reflect the impact of the revision to the specific line items presented in the Company's previously reported Condensed Consolidated Balance Sheets, Condensed Consolidated Statements of Loss, and Condensed Consolidated Statements of Comprehensive Loss for the for fiscal periods beginning with the quarter ended March 31, 2023 through the quarter ended June 30, 2024.


			March 31, 2023
(In thousands)			As Previously Reported				Revision				As Revised
Other non-current liabilities			$	15,986			$	(346	)	(a)	$	15,640
Total Liabilities			$	675,765			$	(346	)		$	675,419
Redeemable Non-Controlling Interest			$	442,668			$	(430	)	(b)	$	442,238
Accumulated Other Comprehensive Income			$	34,526			$	1		(a)	$	34,527
Retained Earnings			$	8,006			$	775		(a)(b)	$	8,781
Total Equity			$	820,162			$	776			$	820,938
Total Liabilities, Redeemable Non-Controlling Interest and Equity			$	1,938,595			$	—			$	1,938,595


			For the Three Months Ended March 31, 2023
(In thousands)			As Previously Reported				Revision				As Revised
Less: Net Loss attributable to non-controlling interest			$	(370	)		$	(345	)	(a)	$	(715	)
Net Loss attributable to ADTRAN Holdings, Inc.			$	(40,083	)		$	345		(a)	$	(39,738	)
Loss per common share attributable to ADTRAN Holdings, Inc. – basic			$	(0.51	)		$	—			$	(0.51	)
Loss per common share attributable to ADTRAN Holdings, Inc. – diluted			$	(0.51	)		$	—			$	(0.51	)
Foreign currency translation gain			$	8,678			$	1		(a)	$	8,679
Other Comprehensive Income, net of tax			$	8,782			$	1			$	8,783
Comprehensive Loss, net of tax			$	(31,671	)		$	1			$	(31,670	)
Less: Comprehensive Income (Loss) attributable to non-controlling interest, net of tax			$	12			$	(345	)	(a)	$	(333	)
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax			$	(31,683	)		$	346		(a)	$	(31,337	)


			June 30, 2023
(In thousands)			As Previously Reported				Revision				As Revised
Other non-current liabilities			$	16,401			$	(695	)	(a)	$	15,706
Total Liabilities			$	665,006			$	(695	)		$	664,311
Redeemable Non-Controlling Interest			$	445,462			$	(3,244	)	(b)	$	442,218
Accumulated Other Comprehensive Income			$	41,483			$	2		(a)	$	41,485
Retained Deficit			$	(41,010	)		$	3,937		(a)(b)	$	(37,073	)
Total Equity			$	782,470			$	3,939			$	786,409
Total Liabilities, Redeemable Non-Controlling Interest and Equity			$	1,882,938			$	—			$	1,882,938


			For the Three Months Ended June 30, 2023												For the Six Months Ended June 30, 2023
(In thousands)			As Previously Reported				Revision				As Revised				As Previously Reported				Revision				As Revised
Less: Net Income attributable to non-controlling interest			$	2,882			$	(348	)	(a)	$	2,534			$	2,512			$	(693	)	(a)	$	1,819
Net Loss attributable to ADTRAN Holdings, Inc.			$	(39,097	)		$	348		(a)	$	(38,749	)		$	(79,180	)		$	693		(a)	$	(78,487	)
Loss per common share attributable to ADTRAN Holdings, Inc. – basic			$	(0.50	)		$	—			$	(0.50	)		$	(1.01	)		$	0.01		(a)	$	(1.00	)
Loss per common share attributable to ADTRAN Holdings, Inc. – diluted			$	(0.50	)		$	—			$	(0.50	)		$	(1.01	)		$	0.01		(a)	$	(1.00	)
Foreign currency translation gain			$	6,940			$	1		(a)	$	6,941			$	15,618			$	2		(a)	$	15,620
Other Comprehensive Income, net of tax			$	6,957			$	1			$	6,958			$	15,739			$	2			$	15,741
Comprehensive Loss, net of tax			$	(29,258	)		$	1			$	(29,257	)		$	(60,929	)		$	2			$	(60,927	)
Less: Comprehensive Income attributable to non-controlling interest, net of tax			$	2,882			$	(348	)	(a)	$	2,534			$	2,894			$	(693	)	(a)	$	2,201
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax			$	(32,140	)		$	349		(a)	$	(31,791	)		$	(63,823	)		$	695		(a)	$	(63,128	)


			September 30, 2023
(In thousands)			As Previously Reported				Revision				As Revised
Other non-current liabilities			$	17,408			$	(1,049	)	(a)	$	16,359
Total Liabilities			$	625,355			$	(1,049	)		$	624,306
Redeemable Non-Controlling Interest			$	431,921			$	10,291		(b)	$	442,212
Accumulated Other Comprehensive Income			$	12,075			$	3		(a)	$	12,078
Retained Deficit			$	(113,289	)		$	(9,245	)	(a)(b)	$	(122,534	)
Total Equity			$	684,893			$	(9,242	)		$	675,651
Total Liabilities, Redeemable Non-Controlling Interest and Equity			$	1,742,169			$	—			$	1,742,169


			For the Three Months Ended September 30, 2023												For the Nine Months Ended September 30, 2023
(In thousands)			As Previously Reported				Revision				As Revised				As Previously Reported				Revision				As Revised
Less: Net Income attributable to non-controlling interest			$	2,914			$	(353	)	(a)	$	2,561			$	5,426			$	(1,046	)	(a)	$	4,380
Net Loss attributable to ADTRAN Holdings, Inc.			$	(78,563	)		$	353		(a)	$	(78,210	)		$	(157,743	)		$	1,046		(a)	$	(156,697	)
Loss per common share attributable to ADTRAN Holdings, Inc. – basic			$	(1.00	)		$	—			$	(1.00	)		$	(2.01	)		$	0.01		(a)	$	(2.00	)
Loss per common share attributable to ADTRAN Holdings, Inc. – diluted			$	(1.00	)		$	—			$	(1.00	)		$	(2.01	)		$	0.01		(a)	$	(2.00	)
Foreign currency translation loss			$	(29,716	)		$	1		(a)	$	(29,715	)		$	(14,098	)		$	3		(a)	$	(14,095	)
Other Comprehensive Loss, net of tax			$	(29,408	)		$	1			$	(29,407	)		$	(13,669	)		$	3			$	(13,666	)
Comprehensive Loss, net of tax			$	(105,057	)		$	1			$	(105,056	)		$	(165,986	)		$	3			$	(165,983	)
Less: Comprehensive Income attributable to non-controlling interest, net of tax			$	2,914			$	(353	)	(a)	$	2,561			$	5,808			$	(1,046	)	(a)	$	4,762
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax			$	(107,971	)		$	354		(a)	$	(107,617	)		$	(171,794	)		$	1,049		(a)	$	(170,745	)


			March 31, 2024
(In thousands)			As Previously Reported				Revision				As Revised
Accrued Expenses and Other Liabilities			$	36,404			$	(1,403	)	(a)	$	35,001
Total Current Liabilities			$	282,746			$	(1,403	)		$	281,343
Other non-current liabilities			$	35,375			$	(350	)	(a)	$	35,025
Total Liabilities			$	620,488			$	(1,753	)		$	618,735
Redeemable Non-Controlling Interest			$	441,635			$	511		(b)	$	442,146
Accumulated Other Comprehensive Income			$	29,656			$	5		(a)	$	29,661
Retained Deficit			$	(558,363	)		$	1,237		(a)(b)	$	(557,126	)
Total Equity			$	265,783			$	1,242			$	267,025
Total Liabilities, Redeemable Non-Controlling Interest and Equity			$	1,327,906			$	—			$	1,327,906


			For the Three Months Ended March 31, 2024
(In thousands)			As Previously Reported				Revision				As Revised
Less: Net Income attributable to non-controlling interest			$	2,880			$	(349	)	(a)	$	2,531
Net Loss attributable to ADTRAN Holdings, Inc.			$	(324,550	)		$	349		(a)	$	(324,201	)
Loss per common share attributable to ADTRAN Holdings, Inc. – basic			$	(4.12	)		$	—			$	(4.12	)
Loss per common share attributable to ADTRAN Holdings, Inc. – diluted			$	(4.12	)		$	—			$	(4.12	)
Foreign currency translation loss			$	(17,745	)		$	1		(a)	$	(17,744	)
Other Comprehensive Loss, net of tax			$	(17,805	)		$	1			$	(17,804	)
Comprehensive Loss, net of tax			$	(339,475	)		$	1			$	(339,474	)
Less: Comprehensive Income attributable to non-controlling interest, net of tax			$	2,880			$	(349	)	(a)	$	2,531
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax			$	(342,355	)		$	350		(a)	$	(342,005	)


			June 30, 2024
(In thousands)			As Previously Reported				Revision				As Revised
Accrued Expenses and Other Liabilities			$	36,307			$	(1,403	)	(a)	$	34,904
Total Current Liabilities			$	289,712			$	(1,403	)		$	288,309
Other non-current liabilities			$	34,445			$	(701	)	(a)	$	33,744
Total Liabilities			$	630,810			$	(2,104	)		$	628,706
Redeemable Non-Controlling Interest			$	439,743			$	2,379		(b)	$	442,122
Accumulated Other Comprehensive Income			$	28,274			$	6		(a)	$	28,280
Retained Deficit			$	(606,375	)		$	(281	)	(a)(b)	$	(606,656	)
Total Equity			$	220,229			$	(275	)		$	219,954
Total Liabilities, Redeemable Non-Controlling Interest and Equity			$	1,290,782			$	—			$	1,290,782


			For the Three Months Ended June 30, 2024												For the Six Months Ended June 30, 2024
(In thousands)			As Previously Reported				Revision				As Revised				As Previously Reported				Revision				As Revised
Less: Net Income attributable to non-controlling interest			$	2,854			$	(350	)	(a)	$	2,504			$	5,734			$	(699	)	(a)	$	5,035
Net Loss attributable to ADTRAN Holdings, Inc.			$	(49,865	)		$	350		(a)	$	(49,515	)		$	(374,415	)		$	699		(a)	$	(373,716	)
Loss per common share attributable to ADTRAN Holdings, Inc. – basic			$	(0.63	)		$	—			$	(0.63	)		$	(4.75	)		$	0.01		(a)	$	(4.74	)
Loss per common share attributable to ADTRAN Holdings, Inc. – diluted			$	(0.63	)		$	—			$	(0.63	)		$	(4.75	)		$	0.01		(a)	$	(4.74	)
Foreign currency translation loss			$	(1,375	)		$	1		(a)	$	(1,374	)		$	(19,120	)		$	2		(a)	$	(19,118	)
Other Comprehensive Loss, net of tax			$	(1,382	)		$	1			$	(1,381	)		$	(19,187	)		$	2			$	(19,185	)
Comprehensive Loss, net of tax			$	(48,393	)		$	1			$	(48,392	)		$	(387,868	)		$	2			$	(387,866	)
Less: Comprehensive Income attributable to non-controlling interest, net of tax			$	2,854			$	(350	)	(a)	$	2,504			$	5,734			$	(699	)	(a)	$	5,035
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax			$	(51,247	)		$	351		(a)	$	(50,896	)		$	(393,602	)		$	701		(a)	$	(392,901	)

The following tables reflect the impact of the revisions to the specific line items presented in the Company’s previously reported Consolidated Balance Sheet as of December 31, 2023, the Consolidated Statement of Loss and the Consolidated Statement of Comprehensive Loss for the year ended December 31, 2023.


			December 31, 2023
(In thousands)			As Previously Reported				Revision				As Revised
Accrued Expenses and Other Liabilities			$	37,607			$	(1,403	)	(a)	$	36,204
Total Current Liabilities			$	279,511			$	(1,403	)		$	278,108
Total Liabilities			$	636,934			$	(1,403	)		$	635,531
Redeemable Non-Controlling Interest			$	451,756			$	(9,604	)	(b)	$	442,152
Accumulated Other Comprehensive Income			$	47,461			$	4		(a)	$	47,465
Retained Deficit			$	(243,908	)		$	11,003		(a)(b)	$	(232,905	)
Total Equity			$	593,822			$	11,007			$	604,829
Total Liabilities, Redeemable Non-Controlling Interest and Equity			$	1,682,512			$	—			$	1,682,512


			For the Year Ended December 31, 2023
(In thousands)			As Previously Reported				Revision				As Revised
Less: Net Income attributable to non-controlling interest			$	8,345			$	(1,399	)	(a)	$	6,946
Net Loss attributable to ADTRAN Holdings, Inc.			$	(267,688	)		$	1,399		(a)	$	(266,289	)
Loss per common share attributable to ADTRAN Holdings, Inc. – basic			$	(3.41	)		$	0.02		(a)	$	(3.39	)
Loss per common share attributable to ADTRAN Holdings, Inc. – diluted			$	(3.41	)		$	0.02		(a)	$	(3.39	)
Foreign currency translation gain			$	22,753			$	4		(a)	$	22,757
Other Comprehensive Income, net of tax			$	21,717			$	4			$	21,721
Comprehensive Loss, net of tax			$	(237,626	)		$	4			$	(237,622	)
Less: Comprehensive Income attributable to non-controlling interest, net of tax			$	8,727			$	(1,399	)	(a)	$	7,328
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax			$	(246,353	)		$	1,403		(a)	$	(244,950	)

The following tables reflect the impact of the revision to the specific line items presented in the Company's previously reported Condensed Consolidated Statements of Changes in Stockholders Equity as of September 30, 2023 and 2024:


			Retained Earnings (Deficit)												Accumulated Other Comprehensive Income
(In thousands)			As Previously Reported				Revision				As Revised				As Previously Reported				Revision				As Revised
Annual recurring compensation earned			$	(2,809	)		$	345		(a)	$	(2,464	)		$	-			$	-			$	-
Other comprehensive income, net of tax			$	-			$	-			$	-			$	8,400			$	1		(a)	$	8,401
Foreign currency remeasurement of redeemable non-controlling interest			$	(430	)		$	430		(b)	$	-			$	-			$	-			$	-
Balance as of March 31, 2023			$	8,006			$	775			$	8,781			$	34,526			$	1			$	34,527
Annual recurring compensation earned			$	(2,882	)		$	348		(a)	$	(2,534	)		$	-			$	-			$	-
Other comprehensive income, net of tax			$	-			$	-			$	-			$	6,957			$	1		(a)	$	6,958
Foreign currency remeasurement of redeemable non-controlling interest			$	(2,814	)		$	2,814		(b)	$	-			$	-			$	-			$	-
Balance as of June 30, 2023			$	(41,010	)		$	3,937			$	(37,073	)		$	41,483			$	2			$	41,485
Annual recurring compensation earned			$	(2,914	)		$	353		(a)	$	(2,561	)		$	-			$	-			$	-
Other comprehensive loss, net of tax			$	-			$	-			$	-			$	(29,408	)		$	1		(a)	$	(29,407	)
Foreign currency remeasurement of redeemable non-controlling interest			$	13,535			$	(13,535	)	(b)	$	-			$	-			$	-			$	-
Balance as of September 30, 2023			$	(113,289	)		$	(9,245	)		$	(122,534	)		$	12,075			$	3			$	12,078


			Retained Deficit												Accumulated Other Comprehensive Income
(In thousands)			As Previously Reported				Revision				As Revised				As Previously Reported				Revision				As Revised
Balance as of December 31, 2023			$	(243,908	)		$	11,003		(a)	$	(232,905	)		$	47,461			$	4		(a)	$	47,465
Annual recurring compensation earned			$	(2,880	)		$	349		(a)	$	(2,531	)		$	-			$	-			$	-
Other comprehensive loss, net of tax			$	-			$	-			$	-			$	(17,805	)		$	1		(a)	$	(17,804	)
Foreign currency remeasurement of redeemable non-controlling interest			$	10,115			$	(10,115	)	(b)	$	-			$	-			$	-			$	-
Balance as of March 31, 2024			$	(558,363	)		$	1,237			$	(557,126	)		$	29,656			$	5			$	29,661
Annual recurring compensation earned			$	(2,854	)		$	350		(a)	$	(2,504	)		$	-							$	-
Other comprehensive loss, net of tax			$	-			$	-			$	-			$	(1,382	)		$	1		(a)	$	(1,381	)
Foreign currency remeasurement of redeemable non-controlling interest			$	1,868			$	(1,868	)	(b)	$	-			$	-			$	-			$	-
Balance as of June 30, 2024			$	(606,375	)		$	(281	)		$	(606,656	)		$	28,274			$	6			$	28,280

The following tables reflect the impact of the revision to the specific line items presented in the Company's previously reported Consolidated Statement of Changes in Stockholders as of December 31, 2023:


			Retained Earnings (Deficit)												Accumulated Other Comprehensive Income
(In thousands)			As Previously Reported				Revision				As Revised				As Previously Reported				Revision				As Revised

Annual recurring compensation earned			$	(11,524	)		$	1,399		(a)	$	(10,125	)		$	-			$	-			$	-
Other comprehensive income, net of tax			$	-			$	-			$	-			$	21,335			$	4		(a)	$	21,339
Foreign currency remeasurement of redeemable non-controlling interest			$	(9,604	)		$	9,604		(b)	$	-			$	-			$	-			$	-
Balance as of December 31, 2023			$	(243,908	)		$	11,003			$	(232,905	)		$	47,461			$	4			$	47,465