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Stock-Based Compensation - Summary of Stock Options Outstanding (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Number of Options, Stock options outstanding, Beginning Balance 3,148,000    
Number of Options, Stock options granted 1,330,000   0
Number of Options, Stock options exercised (23,000)    
Number of Options, Stock options forfeited (74,000)    
Number of Options, Stock options expired (487,000)    
Number of Options, Stock options outstanding, Ending Balance 3,894,000 3,148,000  
Number of Options, Stock options exercisable 1,478,000    
Weighted Average Exercise Price, Stock options outstanding, Beginning Balance $ 14.37    
Weighted Average Exercise Price, Stock options granted 5.27    
Weighted Average Exercise Price, Stock options exercised 7.02    
Weighted Average Exercise Price, Stock options forfeited 11.2    
Weighted Average Exercise Price, Stock options expired 22.74    
Weighted Average Exercise Price, Stock options outstanding, Ending Balance 10.32 $ 14.37  
Weighted Average Exercise Price, Stock options exercisable $ 12.47    
Weighted Average Remaining Contractual Life in Years, Stock options outstanding 5 years 3 months 3 years 5 months 1 day  
Weighted Average Remaining Contractual Life in Years, Stock options exercisable 1 year 7 months 13 days    
Aggregate Intrinsic Value, Stock options outstanding $ 3,087 $ 16,251  
Aggregate Intrinsic Value, Stock options exercisable $ 254    
Adtran Networks [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Number of Options, Stock options outstanding, Beginning Balance 81,000    
Number of Options, Stock options exercised (50,000)    
Number of Options, Stock options forfeited (12,000)    
Number of Options, Stock options expired (1,000)    
Number of Options, Stock options outstanding, Ending Balance 18,000 81,000  
Weighted Average Exercise Price, Stock options outstanding, Beginning Balance $ 8.58    
Weighted Average Exercise Price, Stock options exercised 7.64    
Weighted Average Exercise Price, Stock options forfeited 10.45    
Weighted Average Exercise Price, Stock options expired 9.6    
Weighted Average Exercise Price, Stock options outstanding, Ending Balance $ 11.04 $ 8.58  
Weighted Average Remaining Contractual Life in Years, Stock options outstanding 4 years 5 months 23 days 4 years  
Aggregate Intrinsic Value, Stock options outstanding $ 193 $ 1,222