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STOCKHOLDERS' DEFICIT - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
May 01, 2019
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
 [2]
Nov. 05, 2020
Jul. 25, 2019
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, percentage of voting stock and equity owned by non-US individuals and entities (up to)             25.00%
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)   (3,984) [1] (9,185) [1] (62,547) [2] (9,442)    
Class A Shares | Common Stock              
Class of Stock [Line Items]              
Conversion of Special Warrants to Class A and Class B Shares (in shares)   3,984 [1] 9,185 [1] 62,547 [2] 9,383    
Conversion of Class B Shares to Class A Shares (in shares)   58,476 [1] 0 61,449 [2] 129,877    
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    
Conversion of Class B Shares to Class A Shares (in shares)   (58,476) [1]   (61,449) [2] (129,877)    
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   $ 38.1   $ 38.1      
Unrecognized compensation cost, weighted average period (in years)       1 year 7 months 6 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.