Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2023

Accounting Policies [Abstract]

Summary of Impact of Revision to Specific Line Items in Previously Reported Condensed Consolidated Statements

The following table reflects the impact of the revision to the specific line items presented in the Company’s previously reported Condensed Consolidated Balance Sheet and the Condensed Consolidated Statement of Changes in Equity as of December 31, 2022:

	December 31, 2022
(In thousands)	As Reported		Adjustment			As Revised
Accumulated Other Comprehensive Income	$	46,713	$	(20,587	)	$	26,126
Non-Controlling Interest	$	309,072	$	20,587		$	329,659
Total Equity	$	1,303,613	$	—		$	1,303,613

The following table reflects the impact of the revision to the specific line items presented in the Company’s previously reported Condensed Consolidated Statement of Changes in Equity as of September 30, 2022:

	September 30, 2022
(In thousands)	As Reported			Adjustment			As Restated
Accumulated Other Comprehensive Income	$	(40,288	)	$	7,137		$	(33,151	)
Non-Controlling Interest	$	313,677		$	(7,137	)	$	306,540
Total Equity	$	1,184,827		$	—		$	1,184,827

The following table reflects the impact of the revision to the specific line items presented in the Company’s previously reported Condensed Consolidated Statements of Comprehensive Loss as of September 30, 2022:

	For the Three Months Ended September 30, 2022									For the Nine Months Ended September 30, 2022
(In thousands)	As Reported			Adjustment			As Revised			As Reported			Adjustment			As Revised
Comprehensive Loss attributable to non-controlling interest	$	(94	)	$	(10,062	)	$	(10,156	)	$	(94	)	$	(10,062	)	$	(10,156	)
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax	$	(68,451	)	$	10,062		$	(58,389	)	$	(72,217	)	$	10,062		$	(62,155	)

The following tables reflects the impact of the restatement to the specific line items presented in the Company’s previously reported Condensed Consolidated Statements of Loss and the previously reported Condensed Consolidated Statements of Comprehensive Loss for the three and nine months ended September 30, 2023:

	For the Three Months Ended September 30, 2023									For the Nine Months Ended September 30, 2023
(In thousands)	As Reported			Adjustment			As Restated			As Reported			Adjustment			As Restated
Income (Loss) attributable to non-controlling interest	$	(2,914	)	$	5,828		$	2,914		$	(11,784	)	$	17,210		$	5,426
Net Loss attributable to ADTRAN Holdings, Inc.	$	(72,735	)	$	(5,828	)	$	(78,563	)	$	(140,533	)	$	(17,210	)	$	(157,743	)
Loss per common share attributable to ADTRAN Holdings, Inc. – basic	$	(0.93	)	$	(0.07	)	$	(1.00	)	$	(1.79	)	$	(0.22	)	$	(2.01	)
Loss per common share attributable to ADTRAN Holdings, Inc. – diluted	$	(0.93	)	$	(0.07	)	$	(1.00	)	$	(1.79	)	$	(0.22	)	$	(2.01	)
Comprehensive Income attributable to non-controlling interest	$	—		$	2,914		$	2,914		$	244		$	5,564		$	5,808
Comprehensive Loss attributable to ADTRAN Holdings, Inc., net of tax	$	(105,057	)	$	(2,914	)	$	(107,971	)	$	(166,230	)	$	(5,564	)	$	(171,794	)

The following table reflects the impact of the restatement, in addition to the revision of the December 31, 2022 balances referenced above, to the specific line items presented in the Company’s previously reported Condensed Consolidated Balance Sheets as of September 30, 2023 and the Condensed Consolidated Statement of Changes in Equity for the period ended September 30, 2023:

	September 30, 2023
(In thousands)	As Reported		Adjustment			As Restated
Additional Paid-in Capital	$	770,565	$	20,725		$	791,290
Accumulated Other Comprehensive Income	$	32,800	$	(20,725	)	$	12,075
Total Equity	$	684,893	$	—		$	684,893