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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 [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2023 $ 605,257   $ 790 $ 794,468   $ (231,706) $ (5,825) $ 47,530
Beginning Balance, Shares at Dec. 31, 2023     78,970          
Net (loss) income (328,235)         (328,235)    
Annual recurring compensation earned (2,531)         (2,531)    
Other comprehensive income (loss), net of tax (17,833)             (17,833)
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 $ (6)   3,957 $ (6)      
Redemption of redeemable non-controlling interest 1         1    
Ending Balance at Mar. 31, 2024 $ 260,849   $ 791 798,051   (562,492) (5,198) 29,697
Ending Balance, Shares at Mar. 31, 2024 79,116   79,116          
Beginning Balance at Dec. 31, 2024 $ 126,951   $ 795 808,913   (688,813) (5,198) 11,254
Beginning Balance, Shares at Dec. 31, 2024 79,483   79,483          
Net (loss) income $ (8,948)         (8,948)    
Annual recurring compensation earned (2,319)         (2,319)    
Other comprehensive income (loss), net of tax 20,378             20,378
Deferred compensation adjustments, net of tax 38     (52)     90  
ADTRAN RSUs and restricted stock vested (1,170)   $ 4     (1,174)    
ADTRAN RSUs and restricted stock vested, Shares     373          
ADTRAN Stock options exercised $ 756   $ 1     755    
ADTRAN Stock options exercised, Shares 113   113          
ADTRAN Stock-based compensation expense $ 2,062 $ 1,148   2,062 $ 1,148      
Redemption of redeemable non-controlling interest (3)         (3)    
Ending Balance at Mar. 31, 2025 $ 138,893   $ 800 $ 812,071   $ (700,502) $ (5,108) $ 31,632
Ending Balance, Shares at Mar. 31, 2025 79,969   79,969