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RESTRUCTURING CHARGES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]            
Restructuring charges $ 0 $ 300 $ 0 $ 289 $ 720  
Employee Severance | Chief Executive Officer            
Restructuring Cost and Reserve [Line Items]            
Restructuring and related cost, expected cost remaining 0     0    
Restructuring charges           $ 1,500
Spectrum Reorganization Plan | Employee Severance            
Restructuring Cost and Reserve [Line Items]            
Cost incurred, cumulative 3,300     3,300    
Spectrum Reorganization Plan | Facility exit costs            
Restructuring Cost and Reserve [Line Items]            
Cost incurred, cumulative 1,300     1,300    
Restructuring and related cost, expected cost remaining $ 0     $ 0