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STOCKHOLDERS' DEFICIT - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
May 01, 2019
Jun. 30, 2024
Jun. 30, 2023
 [1]
Jun. 30, 2024
Jun. 30, 2023
 [2]
Nov. 05, 2020
Class of Stock [Line Items]            
Award vesting period (in months)       3 years    
Special Warrants            
Class of Stock [Line Items]            
Special warrants, number of securities called by each warrant (in shares) 1          
Special warrants, exercise price per share (in dollars per share) $ 0.001          
Special warrants, conversion terms, ownership percentage of common stock (as a percent) 4.99%          
Special warrants, conversion terms, ownership percentage of capital stock or voting interests (as a percent) 22.50%          
FCC petitions for declaratory ruling, foreign owned percentage permitted           100.00%
Special Warrants | Common Stock            
Class of Stock [Line Items]            
Conversion of Special Warrants to Class A and Class B Shares (in shares)   (29) [1] (257) (58,563) [2] (257)  
Class A Shares | Common Stock            
Class of Stock [Line Items]            
Conversion of Special Warrants to Class A and Class B Shares (in shares)   29 [1] 198 58,563 [2] 198  
Class B Shares | Common Stock            
Class of Stock [Line Items]            
Conversion of Special Warrants to Class A and Class B Shares (in shares)   0 59 0 59  
Performance RSUs            
Class of Stock [Line Items]            
Award vesting period (in months)       50 months    
Awards Vesting Based On Service Conditions            
Class of Stock [Line Items]            
Unrecognized compensation cost   $ 44.8   $ 44.8    
Unrecognized compensation cost, weighted average period (in years)       1 year 8 months 12 days    
[1] The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2024 or 2023.
[2] The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2024, 2023 or 2022.