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STOCKHOLDERS' DEFICIT - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Special Warrants        
Class of Stock [Line Items]        
Special warrants, number of securities called by each warrant (in shares) 1   1  
Special warrants, exercise price per share (in dollars per share) $ 0.001   $ 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) 22.50%   22.50%  
FCC petitions for declaratory ruling, foreign owned percentage permitted 100.00%   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]   (58,563) [2]
Class A Shares | Common Stock        
Class of Stock [Line Items]        
Conversion of special warrants to class A and class B shares (in shares) 0 29 [1] 0 58,563 [2]
Class B Shares | Common Stock        
Class of Stock [Line Items]        
Conversion of special warrants to class A and class B shares (in shares)   0 0 0
Awards Vesting Based On Service Conditions        
Class of Stock [Line Items]        
Unrecognized compensation cost $ 21.4   $ 21.4  
Unrecognized compensation cost, weighted average period (in years)     1 year 9 months 18 days  
Minimum        
Class of Stock [Line Items]        
Award vesting period (in months)     1 year  
Maximum        
Class of Stock [Line Items]        
Award vesting period (in months)     3 years  
[1] The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2025, or 2024.
[2] The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2025, or 2024, or 2023.