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STOCKHOLDERS' EQUITY (DEFICIT) - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2022
May 01, 2019
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Nov. 05, 2020
Jul. 25, 2019
Class of Stock [Line Items]                
Share-based compensation expense     $ 9,212 $ 8,610 $ 19,364 $ 14,145    
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)     198 [1] 14 198 11,375    
Class B Shares                
Class of Stock [Line Items]                
Conversion of Special Warrants to Class A and Class B Shares (in shares)     59   59 0    
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, weighted average period (in years)         2 years 9 months 18 days      
Unrecognized compensation cost     $ 42,300   $ 42,300      
Performance RSUs                
Class of Stock [Line Items]                
Share-based compensation expense     2,300 $ 1,500 $ 4,232 $ 1,500    
Award vesting period (in months)         50 months      
Unrecognized compensation cost     $ 24,600   $ 24,600      
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.