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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 Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Non-controlling Interest [Member]
Non-controlling Interest [Member]
ADVA Optical Networking 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 (1,127)         (1,127)        
Other comprehensive income (loss), net of tax (1,642)             (1,642)    
Dividend payments ($0.09 per share) (4,438)         (4,438)        
Dividends accrued on unvested RSUs 32         32        
Deferred compensation adjustments, net of tax (18)           (18)      
ADTRAN RSUs, PSUs, RSUs and restricted stock vested (54)         (895) 841      
ADTRAN Stock options exercised 568         (143) 711      
ADTRAN Stock-based compensation expense 1,893     1,893            
Ending Balance at Mar. 31, 2022 352,316   $ 797 290,839   734,249 (660,013) (13,556)    
Ending Balance, Shares at Mar. 31, 2022     79,652              
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   78,088              
Net loss $ (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 ($0.09 per share) (7,076)         (7,076)        
Deferred compensation adjustments, net of tax (1,792)           (1,792)      
ADTRAN RSUs, PSUs, RSUs and restricted stock vested (138)   $ 6     (144)        
ADTRAN RSUs, PSUs, RSUs and restricted stock vested, Shares     561              
ADTRAN Stock options exercised $ 58         58        
ADTRAN Stock options exercised, Shares 6   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   78,655