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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 (2,809)         (2,809)      
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 8,782             8,400 382
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      
Foreign currency remeasurement of redeemable non-controlling interest (430)         (430)      
Ending Balance at Mar. 31, 2023 820,162   $ 787 782,760   8,006 (5,917) 34,526  
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 15,739                
Ending Balance at Jun. 30, 2023 782,470   $ 787 787,153   (41,010) (5,943) 41,483  
Ending Balance, Shares at Jun. 30, 2023     78,661            
Beginning Balance at Mar. 31, 2023 820,162   $ 787 782,760   8,006 (5,917) 34,526  
Beginning Balance, Shares at Mar. 31, 2023     78,655            
Net (loss) income (36,215)         (36,215)      
Annual recurring compensation earned (2,882)         (2,882)      
Other comprehensive income (loss), net of tax 6,957             6,957  
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      
Foreign currency remeasurement of redeemable non-controlling interest (2,814)         (2,814)      
Ending Balance at Jun. 30, 2023 782,470   $ 787 787,153   (41,010) (5,943) 41,483  
Ending Balance, Shares at Jun. 30, 2023     78,661            
Beginning Balance at Dec. 31, 2023 $ 593,822   $ 790 795,304   (243,908) (5,825) 47,461  
Beginning Balance, Shares at Dec. 31, 2023 78,970   78,970            
Net (loss) income $ (321,670)         (321,670)      
Annual recurring compensation earned (2,880)         (2,880)      
Other comprehensive income (loss), net of tax (17,805)             (17,805)  
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      
Foreign currency remeasurement of redeemable non-controlling interest 10,115         10,115      
Ending Balance at Mar. 31, 2024 265,783   $ 791 798,897   (558,363) (5,198) 29,656  
Ending Balance, Shares at Mar. 31, 2024     79,116            
Beginning Balance at Dec. 31, 2023 $ 593,822   $ 790 795,304   (243,908) (5,825) 47,461  
Beginning Balance, Shares at Dec. 31, 2023 78,970   78,970            
Other comprehensive income (loss), net of tax $ (19,187)                
ADTRAN Stock options exercised, Shares 36                
Ending Balance at Jun. 30, 2024 $ 220,229   $ 791 802,737   (606,375) (5,198) 28,274  
Ending Balance, Shares at Jun. 30, 2024 79,121   79,121            
Beginning Balance at Mar. 31, 2024 $ 265,783   $ 791 798,897   (558,363) (5,198) 29,656  
Beginning Balance, Shares at Mar. 31, 2024     79,116            
Net (loss) income (47,011)         (47,011)      
Annual recurring compensation earned (2,854)         (2,854)      
Other comprehensive income (loss), net of tax (1,382)             (1,382)  
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      
Foreign currency remeasurement of redeemable non-controlling interest 1,868         1,868      
Ending Balance at Jun. 30, 2024 $ 220,229   $ 791 $ 802,737   $ (606,375) $ (5,198) $ 28,274  
Ending Balance, Shares at Jun. 30, 2024 79,121   79,121