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STOCKHOLDERS' DEFICIT - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
May 01, 2019
Mar. 31, 2024
Mar. 31, 2023
Nov. 05, 2020
Jul. 25, 2019
Class of Stock [Line Items]          
Share-based compensation expense   $ 8,480 $ 10,152    
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)     0    
Class B Shares          
Class of Stock [Line Items]          
Conversion of Special Warrants to Class A and Class B Shares (in shares)   0 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   $ 51,300      
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   $ 2,789 $ 1,931    
Award vesting period (in months)   50 months