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Consolidated Statements of Changes in Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Adtran Networks SE [Member]
Common Stock [Member]
Common Stock [Member]
Adtran Networks SE [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Adtran Networks SE [Member]
Retained Earnings (Deficit) [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Non-controlling Interest [Member]
Non-controlling Interest [Member]
Adtran Networks SE [Member]
Beginning Balance at Dec. 31, 2021 $ 357,102   $ 797   $ 288,946   $ 740,820 $ (661,547) $ (11,914)    
Beginning Balance, Shares at Dec. 31, 2021     79,652                
Net loss (8,888)           (2,037)     $ (6,851)  
Acquisition of Adtran Networks   $ 894,675   $ 280   $ 577,980         $ 316,415
Acquisition of Adtran Networks, Shares       27,995              
Retirement of treasury stock     $ (303)       (655,761) 656,064      
Retirement of treasury stock, Shares     (30,330)                
Other comprehensive income (loss), net of tax 57,709               38,040 19,669  
Dividend payments ($0.09 per share) (22,885)           (22,885)        
Dividends accrued on unvested restricted stock units 353           353        
Deferred compensation adjustments, net of tax (71)             (71)      
ADTRAN Stock options exercised 6,131 726 $ 3     472 5,330 798     254
ADTRAN Stock options exercised, Shares     399                
ADTRAN RSUs and restricted stock vested (9,847)   $ 4       (10,482) 631      
ADTRAN RSUs and restricted stock vested, Shares     372                
Reclassification of Adtran Networks stock options 286       187         99  
ADTRAN Stock-based compensation expense 26,141 2,181     26,141 2,108         73
Ending Balance at Dec. 31, 2022 1,303,613   $ 781   895,834   55,338 (4,125) 26,126 329,659  
Ending Balance, Shares at Dec. 31, 2022     78,088                
Net loss (259,343)           (256,164)     (3,179)  
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 21,721               21,339 $ 382  
Dividend payments ($0.09 per share) (21,237)           (21,237)        
Dividends accrued on unvested restricted stock units 8           8        
Deferred compensation adjustments, net of tax (1,845)           (145) (1,700)      
ADTRAN Stock options exercised 164 323       323 164        
ADTRAN Stock options exercised, Shares     23                
ADTRAN RSUs and restricted stock vested (1,106)   $ 9       (1,115)        
ADTRAN RSUs and restricted stock vested, Shares     859                
Redemption of redeemable non-controlling interest 371           371        
Annual recurring compensation earned (10,125)           (10,125)        
ADTRAN Stock-based compensation expense 16,016 26     16,016 26          
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                
Net loss $ (441,048)           (441,048)        
Other comprehensive income (loss), net of tax (36,568)               (36,568)    
Deferred compensation adjustments, net of tax 259       (368)     627      
ADTRAN Stock options exercised $ 825   $ 1       824        
ADTRAN Stock options exercised, Shares 139   139                
Modification of stock options $ (190)       (190)            
ADTRAN RSUs and restricted stock vested (1,022)   $ 4       (1,026)        
ADTRAN RSUs and restricted stock vested, Shares     374                
Redemption of redeemable non-controlling interest 2,986           2,986        
Annual recurring compensation earned (9,824)           (9,824)        
Remeasurement of redeemable non-controlling interest (1,175)       (1,175)            
ADTRAN Stock-based compensation expense 14,825 $ 517     14,825 $ 517          
Ending Balance at Dec. 31, 2024 $ 134,414   $ 795   $ 808,913   $ (680,993) $ (5,198) $ 10,897    
Ending Balance, Shares at Dec. 31, 2024 79,483   79,483