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Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
ADVA Optical Networking SE [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
ADVA Optical Networking 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 ADVA (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, 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   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   79,116