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STOCKHOLDERS' EQUITY (DEFICIT) - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
May 01, 2019
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Nov. 05, 2020
Jul. 25, 2019
Class of Stock [Line Items]              
Share-based compensation expense   $ 8,191 $ 10,437 $ 27,555 $ 24,582    
Award vesting period (in months)       3 years      
Class A Shares              
Class of Stock [Line Items]              
Conversion of Special Warrants to Class A and Class B Shares (in shares)   9,185 [1] 85,141 9,383 96,516    
Class B Shares              
Class of Stock [Line Items]              
Conversion of Special Warrants to Class A and Class B Shares (in shares)   0   59      
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%  
Awards Vesting Based On Service Conditions              
Class of Stock [Line Items]              
Unrecognized compensation cost   $ 36,500   $ 36,500      
Unrecognized compensation cost, weighted average period (in years)       1 year 10 months 24 days      
Performance RSUs              
Class of Stock [Line Items]              
Share-based compensation expense   2,288 $ 2,044 $ 6,520 $ 3,544    
Award vesting period (in months)       50 months      
Unrecognized compensation cost   $ 22,300   $ 22,300      
Performance RSUs | Minimum              
Class of Stock [Line Items]              
Unrecognized compensation cost, weighted average period (in years)       3 years      
Performance RSUs | Maximum              
Class of Stock [Line Items]              
Unrecognized compensation cost, weighted average period (in years)       50 months      
[1] The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2023 or 2022.