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Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Adtran Networks SE [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Adtran Networks SE [Member]
Retained Deficit Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income [Member]
Non-controlling Interest [Member]
Beginning Balance at Dec. 31, 2022 $ 1,303,613   $ 781 $ 895,834   $ 55,338 $ (4,125) $ 26,126 $ 329,659
Beginning Balance, Shares at Dec. 31, 2022     78,088            
Net (loss) income (40,453)         (37,274)     (3,179)
Annual recurring compensation earned (2,464)         (2,464)      
Reclassification and remeasurement from equity to mezzanine equity for non-controlling interests in Adtran Networks (443,757)     (116,895)         (326,862)
Other comprehensive income (loss), net of tax 8,783             8,401 382
Dividend payments to ADTRAN Holdings, Inc. shareholders ($0.09 per share) (7,076)         (7,076)      
Deferred compensation adjustments, net of tax (1,792)           (1,792)    
ADTRAN RSUs and restricted stock vested (138)   $ 6     (144)      
ADTRAN RSUs and restricted stock vested, Shares     561            
ADTRAN Stock options exercised 58         58      
ADTRAN Stock options exercised, Shares     6            
ADTRAN Stock-based compensation expense 3,812 $ 9   3,812 $ 9        
Redemption of redeemable non-controlling interest 343         343      
Ending Balance at Mar. 31, 2023 820,938   $ 787 782,760   8,781 (5,917) 34,527  
Ending Balance, Shares at Mar. 31, 2023     78,655            
Beginning Balance at Dec. 31, 2022 1,303,613   $ 781 895,834   55,338 (4,125) 26,126 329,659
Beginning Balance, Shares at Dec. 31, 2022     78,088            
Other comprehensive income (loss), net of tax 15,741                
Ending Balance at Jun. 30, 2023 786,409   $ 787 787,153   (37,073) (5,943) 41,485  
Ending Balance, Shares at Jun. 30, 2023     78,661            
Beginning Balance at Dec. 31, 2022 1,303,613   $ 781 895,834   55,338 (4,125) 26,126 329,659
Beginning Balance, Shares at Dec. 31, 2022     78,088            
Other comprehensive income (loss), net of tax (13,666)                
Ending Balance at Sep. 30, 2023 675,651   $ 787 791,290   (122,534) (5,970) 12,078  
Ending Balance, Shares at Sep. 30, 2023     78,688            
Beginning Balance at Dec. 31, 2022 1,303,613   $ 781 895,834   55,338 (4,125) 26,126 $ 329,659
Beginning Balance, Shares at Dec. 31, 2022     78,088            
Other comprehensive income (loss), net of tax 21,721             21,339  
Ending Balance at Dec. 31, 2023 $ 604,829   $ 790 795,304   (232,905) (5,825) 47,465  
Ending Balance, Shares at Dec. 31, 2023 78,970   78,970            
Beginning Balance at Mar. 31, 2023 $ 820,938   $ 787 782,760   8,781 (5,917) 34,527  
Beginning Balance, Shares at Mar. 31, 2023     78,655            
Net (loss) income (36,215)         (36,215)      
Annual recurring compensation earned (2,534)         (2,534)      
Other comprehensive income (loss), net of tax 6,958             6,958  
Dividend payments to ADTRAN Holdings, Inc. shareholders ($0.09 per share) (7,076)         (7,076)      
Dividends accrued for RSUs 9         9      
Deferred compensation adjustments, net of tax (26)           (26)    
ADTRAN RSUs and restricted stock vested (44)         (44)      
ADTRAN RSUs and restricted stock vested, Shares     6            
ADTRAN Stock options exercised   92     92        
ADTRAN Stock-based compensation expense 4,291 10   4,291 10        
Redemption of redeemable non-controlling interest 6         6      
Ending Balance at Jun. 30, 2023 786,409   $ 787 787,153   (37,073) (5,943) 41,485  
Ending Balance, Shares at Jun. 30, 2023     78,661            
Net (loss) income (75,649)         (75,649)      
Annual recurring compensation earned (2,561)         (2,561)      
Other comprehensive income (loss), net of tax (29,407)             (29,407)  
Dividend payments to ADTRAN Holdings, Inc. shareholders ($0.09 per share) (7,085)         (7,085)      
Dividends accrued for RSUs (8)         (8)      
Deferred compensation adjustments, net of tax (27)           (27)    
ADTRAN RSUs and restricted stock vested (175)         (175)      
ADTRAN RSUs and restricted stock vested, Shares     25            
ADTRAN Stock options exercised 15       8 15      
ADTRAN Stock options exercised, Shares     2            
ADTRAN Stock-based compensation expense 4,126     4,126 3        
Redemption of redeemable non-controlling interest 2         2      
Ending Balance at Sep. 30, 2023 675,651   $ 787 791,290   (122,534) (5,970) 12,078  
Ending Balance, Shares at Sep. 30, 2023     78,688            
Beginning Balance at Dec. 31, 2023 $ 604,829   $ 790 795,304   (232,905) (5,825) 47,465  
Beginning Balance, Shares at Dec. 31, 2023 78,970   78,970            
Net (loss) income $ (321,670)         (321,670)      
Annual recurring compensation earned (2,531)         (2,531)      
Other comprehensive income (loss), net of tax (17,804)             (17,804)  
Deferred compensation adjustments, net of tax 262     (368)   3 627    
ADTRAN RSUs and restricted stock vested (242)   $ 1     (243)      
ADTRAN RSUs and restricted stock vested, Shares     110            
ADTRAN Stock options exercised 219         219      
ADTRAN Stock options exercised, Shares     36            
ADTRAN Stock-based compensation expense 3,957 4   3,957 4        
Redemption of redeemable non-controlling interest 1         1      
Ending Balance at Mar. 31, 2024 267,025   $ 791 798,897   (557,126) (5,198) 29,661  
Ending Balance, Shares at Mar. 31, 2024     79,116            
Beginning Balance at Dec. 31, 2023 $ 604,829   $ 790 795,304   (232,905) (5,825) 47,465  
Beginning Balance, Shares at Dec. 31, 2023 78,970   78,970            
Other comprehensive income (loss), net of tax $ (19,185)                
Ending Balance at Jun. 30, 2024 219,954   $ 791 802,737   (606,656) (5,198) 28,280  
Ending Balance, Shares at Jun. 30, 2024     79,121            
Beginning Balance at Dec. 31, 2023 $ 604,829   $ 790 795,304   (232,905) (5,825) 47,465  
Beginning Balance, Shares at Dec. 31, 2023 78,970   78,970            
Other comprehensive income (loss), net of tax $ (88)                
ADTRAN Stock options exercised, Shares 36                
Ending Balance at Sep. 30, 2024 $ 213,994   $ 792 806,187   (635,164) (5,198) 47,377  
Ending Balance, Shares at Sep. 30, 2024 79,233   79,233            
Beginning Balance at Mar. 31, 2024 $ 267,025   $ 791 798,897   (557,126) (5,198) 29,661  
Beginning Balance, Shares at Mar. 31, 2024     79,116            
Net (loss) income (47,011)         (47,011)      
Annual recurring compensation earned (2,504)         (2,504)      
Other comprehensive income (loss), net of tax (1,381)             (1,381)  
Deferred compensation adjustments, net of tax (3)         (3)      
ADTRAN RSUs and restricted stock vested (16)         (16)      
ADTRAN RSUs and restricted stock vested, Shares     5            
ADTRAN Stock-based compensation expense 3,836 4   3,836 4        
Redemption of redeemable non-controlling interest 4         4      
Ending Balance at Jun. 30, 2024 219,954   $ 791 802,737   (606,656) (5,198) 28,280  
Ending Balance, Shares at Jun. 30, 2024     79,121            
Net (loss) income (28,857)         (28,857)      
Annual recurring compensation earned (2,382)         (2,382)      
Other comprehensive income (loss), net of tax 19,097             19,097  
ADTRAN RSUs and restricted stock vested (244)   $ 1     (245)      
ADTRAN RSUs and restricted stock vested, Shares     112            
ADTRAN Stock-based compensation expense 3,623 $ 17   3,623 $ 17        
Redemption of redeemable non-controlling interest 2,976         2,976      
Modification of Stock Options (190)     (190)          
Ending Balance at Sep. 30, 2024 $ 213,994   $ 792 $ 806,187   $ (635,164) $ (5,198) $ 47,377  
Ending Balance, Shares at Sep. 30, 2024 79,233   79,233